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Thread: How's this engine coolant temperature?

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    Re: How's this engine coolant temperature?

    Yep. Bottom left pic is the engine side.

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    Re: How's this engine coolant temperature?

    Is the check valve (by pass) working correctly?

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    Re: How's this engine coolant temperature?

    Appears so. It is a brass housing with a ball bearing moving around inside. When I mounted it I made sure the check valve was at the top as well. I have double checked and there is no air in the system.

    I let he truck cool down completely and just before dusk checked everything again. The outside temps were about 89. With the heat full blast and idling the temps stayed right at 190. With the heat off the temps leveled off at 194. With the ac on it rose to 196. With max ac 201. Revving made it drop but sustained 2k rpm it got up to 208. Not crazy hot but this is while sitting still and temps under 90. I am sure we have many hot days ahead and I commute 50 miles each way everyday. I sure don't want it to get hot again. On a side note before doing all this work I have had the ac cut out while idling on hot days but have never seen the engine hot light come on. Any way to verify it is working properly?

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    Re: How's this engine coolant temperature?

    Try a 180 degree stat, I bet it won't run 200 degrees. If everything else is operating correctly is should run no more than 10-15 degrees hotter than the stat, 190-195.

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    Re: How's this engine coolant temperature?

    I put the 180 in just as a storm rolled through this evening. I will see how it does in the morning. While I was looking at some online info I noticed that it should have an air baffle in front of the condenser. Mine does not. Is it possible that this is the root of my issues?

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    Re: How's this engine coolant temperature?

    I never noticed a baffle in front of the condenser coil, I'll go out and take a look.

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    Re: How's this engine coolant temperature?

    Are you refering to the piece from the radiator core support to the grill, if so yes you need that to direct air from the grill across the radiator.

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    Re: How's this engine coolant temperature?

    It ran about 194 in stop and go traffic but after getting off the big road and pulling into a store parking lot it crept p to 217. Once I got home I took the grill off and stuck my had between the cross member and the front of the condenser near the bottom of the rad. Sure enough it was pulling hot air from the bottom of the fan. I removed the front skid plate and that cut most of it out. Test drive 20 mile round trip confirmed. Temps driving was no higher than 187. Parked 196 but I am sure it was still pulling some of the hot air into the rad.

    I found a set of baffles new on eBay. I will just leave the front skid plate off until they arrive.

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    Re: How's this engine coolant temperature?

    image.jpg
    Quote Originally Posted by MSC View Post
    Are you refering to the piece from the radiator core support to the grill, if so yes you need that to direct air from the grill across the radiator.
    Mine does not have #11 or 12. I ordered both

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    Re: How's this engine coolant temperature?

    That should direct air through the radiator, mine has all of those. I bet you'll be happy with your temperature after your finished, I know I am with my mods, it's such a peace of mind. I really feel if you can keep your temperature down you will not have the engine or head problems that some are having.

    Great job

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    Re: How's this engine coolant temperature?

    Put the lower baffles on. Didn't seat tight against radiator so I put metal tape keeping gap closed. Ambient temps mid 90s. Driving temps stayed around 190-194. Parked after higher speeds and temps crept up to 205. After a few minutes returned to 192.

    I still have the 180 tstat in. If I put the 190 in it will warm up quicker but will it actually affect the top temp or no matter if I have the 180 or 190 in the high end would be about the same? Seemed to take a while to reach 190 this morning and I am afraid it will not only eat more gas but may run to cool this fall and winter. Nice problem but still a concern.

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    Re: How's this engine coolant temperature?

    I had a 170 degree stat in at first and it threw a too cold code, I then put in a 180 degree stat and it works great all year. If your cooling system is operating correctly, a 180 degree stat should run around 190 degrees that's half open on the stat.

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    Re: How's this engine coolant temperature?

    I've had my 180 degree stat in for over 2 years with no problems or codes...I'm staying with it.

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    Re: How's this engine coolant temperature?

    MSC, Ill buy one from you!. I added a trans cooler and saw no real change in my operating temp.

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    Re: How's this engine coolant temperature?

    If I had to do it all over again...I would do it all over again.
    It works great in this hot weather we're having.

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    Re: How's this engine coolant temperature?

    I still have the 180 in and every once in a while in stop and go traffic I get spikes. Even though I have foam insulated all the gaps around the baffles behind the grill I believe some hot air is still being recirculated. I am going to tear into it again today to see where it is coming from. It is consistently running cooler so the rest of the cooling system is doing what it should it is that darn recirculated hot air off engine and back of fan that is causing the spikes. I will get it figured out.

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    Re: How's this engine coolant temperature?

    Brucesans,
    Are you sure your fan clutch is good, that's the only thing that I can think of that would let it spike. Even in 100+ degrees that we are getting right now, mine doesn't get above 195 at any time.
    I'm sure you will figure it out.
    Mark

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    Re: How's this engine coolant temperature?

    I have the clutch fan that came on it when I bought it in June and a new one. Same results no matter which fan. As you I suspected air flow was the issue since the spikes only happen when it is really hot out and congested stop and go traffic. That's what made me look at all the things that would contribute to the issue.

    What I quickly found was mine did not have the crossmember baffle or the other large baffle that surrounds the entire space between the radiator area and the grill area. Reading up on the subject I found where if they were removed hot air exiting the fan will travel along the front skid plate under the radiator and be recirculated through the radiator. Basically extra heated air preventing the radiator and clutch fan from doing what it is designed to do. Mine would get up to 230 before. With the baffles installed and extra foam filling in the gaps I could find now it only gets up to mid 210. But that is with the 180 stat. I am hoping to plug whatever gaps I missed so I get rid of all spikes.

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    Re: How's this engine coolant temperature?

    Quote Originally Posted by MSC View Post
    I've had my 180 degree stat in for over 2 years with no problems or codes...I'm staying with it.
    Yup, what he said.

    There he goes. One of God's own prototypes.
    A high-powered mutant of some kind never even considered for mass production.
    Too weird to live, and too rare to die...

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    Re: How's this engine coolant temperature?

    Here is the option for cooling your engine:

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    Re: How's this engine coolant temperature?

    Does it cost less than $100.00?

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    Re: How's this engine coolant temperature?

    It looks nice! Add 2 small fans and it wld be even better!

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    Re: How's this engine coolant temperature?

    RunCool Louvers
    $320.00 - $350.00 plus shipping...then deal with water damage.
    No thanks!

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    Re: How's this engine coolant temperature?

    I still have the 180 stat in. In another thread I talked about a broken exhaust manifold bolt that is allowing super hot gasses to escape from the rear jug. I have given up on trying to get the bolt out since the previous owner apparently buggered it up so bad that the head wall is dangerously thin in one part but I have sealed the leak with copper spray, new gasket and muffler repair putty cured over 24 hours before running. I will pull the head when the funds become available but what I have noticed since putting the bandaid on the exhaust leak is that the temps stay between 180 and 195 no matter how hard I push it.

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    Re: How's this engine coolant temperature?

    That's good to know about the temps. Have you tried to have a muffler shop make the repair to the bolt...I'm sure one of them have dealt with it before

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    Re: How's this engine coolant temperature?

    I have a good relationship with a machine shop. I will eventually pull the head and if it is repairable I will get them to do it. If not they will get me a good deal on a new head and set it up for me. Just need to hold out until the funds are available.

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    Re: How's this engine coolant temperature?

    Money has everything to do with everything.

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    Re: How's this engine coolant temperature?

    I have searched and the only threads I am finding where Efans were installed were on H2s. Has anyone installed the PCM complete kit on a H3. Wondering how well it worked out. Also curious about other kits that may be available for an 07 model.

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    Re: How's this engine coolant temperature?

    Greetings from Russia! I made this thermostat with replaceable cartridge. Opening temperature of the thermostat 82 degrees Celsius, and the second option is at 88 degrees Celsius.
    Attached Images Attached Images

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    Re: How's this engine coolant temperature?

    Looks good!

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    Re: How's this engine coolant temperature?

    I agree. Looks good and looks to accept standard thermostat replacement. If it is replacing lower stat housing that is the only thing I don't like. It will still be a pain to replace. I really appreciate having it up top where it meters the heat off the head and is easy to get to.

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    Re: How's this engine coolant temperature?

    Update- blew a radiator hose on my setup last week. On the upside, it seems to be working better with fresh fluid in it.

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    Re: How's this engine coolant temperature?

    Installing the thermostat in the coolant inlet location will still short cycle the stat, I have found it best to install it at the top (coolant outlet). The cooled coolant coming in from the radiator will cause the stat to open and close to soon instead of letting the engine saturate with cooled coolant and operating at a steady temperature.

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    Re: How's this engine coolant temperature?

    Yep. What MSC said. I have up top and get quick warm ups and steady temps. Also with the 180 it runs cool on really hot days. Now I'm in process of building efan setup.

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    Re: How's this engine coolant temperature?

    I did a thermostat mod on my h3 Saturday, using a 180 stat. Everything looking good, runs between 180 - 190.DSCF2650.jpg

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    Re: How's this engine coolant temperature?

    Almost like my setup. You will like the results.

    I will be adding an inline temp sending unit on upper hose once I get the shroud for my efan setup done. I will post pics
    Last edited by Brucesans; 03-13-2017 at 07:26 PM.

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    Re: How's this engine coolant temperature?

    You do great work. I used your idea to build mine.

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    Re: How's this engine coolant temperature?

    So question: I decided to change the ETC Sensor after changing thermostat and fluid cause my temp was around 94 -96 Celsius.
    With the new ETC sensor the temp dropped at 79 Celsius???? and the error code P0128 was back.
    So i cleaned and put the old Sensor in and my temp went back to 94-96 Cel.? No error code
    Why did the temp get that low with the new Sensor?
    I will let the old Sensor in now and see, my temperature is good i think around 94-96 Cel.

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    Re: How's this engine coolant temperature?

    Remove both sensors and let them set in the temperature for a while and check the resistance with a volt/ohm meter, Is the European sensor the same as here in the States...maybe different resistance for C and F?

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    Re: How's this engine coolant temperature?

    Got the sensor and thermostat from US parts UK

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    Re: How's this engine coolant temperature?

    Now since replacing the new ETC with the old ETC in, temp runs around 192-196. After stopping a while and let the engine at idle, Temp goes up 206-208. No P0128 code. Is this still OK?
    Last edited by H3Hummer; 05-24-2017 at 09:24 AM.

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    Re: How's this engine coolant temperature?

    Quote Originally Posted by H3Hummer View Post
    Now since replacing the new ETC with the old ETC in, temp runs around 192-196. After stopping a while and let the engine at idle, Temp goes up 206-208. No P0128 code. Is this still OK?
    I think that temp. is fine.
    I wouldn't worry unless you start seeing temps. higher than 220F
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    Re: How's this engine coolant temperature?

    Update: After 2 1/2 months since mod, temp here over 100F, highest temp reached after setting idling 45 min, was 191F. I am very happy with these results. THANKS go out to all who pioneered this mod!! This mod has put to rest my worries about a cracked head from excessive heat, and burnt valve seats.

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    Re: How's this engine coolant temperature?

    Great to hear, that was the best and most cost effective mod that I could come up with because GM said not to let it get over 225, will cause damage.

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    Re: How's this engine coolant temperature?

    After running 1 year with my thermostat mod, here is what I found. Right after my mod, I replaced my water pump, 7 blade fan with an 8 blade, a severe duty fan clutch, and my radiator with an aluminum one, running a 180 degree thermostat, no codes or ck engine light, coolant temperature stays between 180F and 195F in temperatures between 20F and 120F, on road and off road. This is a great improvement over the factory set up. I get 15mpg around the city, and 17 on highway. I'm happy with this, and recommend it to anyone concerned with their engine temp.

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    Re: How's this engine coolant temperature?

    Had no codes or problems since 05.2017 when i changed thermostat and ETC

    God did not build mountains in vain, but to be climbed by Hummers,
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    Re: How's this engine coolant temperature?

    I pulled the 180 and put in a 190 while we were bellow zero temps. Since I expect to put the 180 back in during summer months I picked up a second housing so the swap will only take a few minutes.

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    Re: How's this engine coolant temperature?

    I installed a trans temp gauge to monitor my temp when off road, and found the temp stays with the engine temp, even on long slow (low lock/low gear) climbs in very hot weather. I haven't installed an additional cooler. I'm glad to hear you're not having any more cooling problems. It is rare here to get down to freezing, and I run the 180 thermostat year round without problems. Heat is always the big concern here.

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    Re: How's this engine coolant temperature?

    H3hummer, glad to hear you're not having any problems. Way too cold there for an old desert rat like me.

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    Re: How's this engine coolant temperature?

    Overe here the winter is almost done, we've had only a few cm of snow

    God did not build mountains in vain, but to be climbed by Hummers,
    2006 H3 3,5L manual transmission ,Adventure pack with 4:1 Tcase and rear diff locker, 2,5" front lift ,Bilstein 5100 front shocks with 1/2" extended Bump stops, 1,25" rear lift warrior shakles and Bilstein 4600,
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