G35 Sedan V36 2007- 08 Discussion about the 2nd Generation G35 Sedan 2007 - 08

Coolant Temp Seems High

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Old Oct 15, 2019 | 02:53 PM
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Coolant Temp Seems High

Is it normal for my coolant temp to be around 210 degrees? I was driving around today and my coolant gauge was saying it was normal but I have a scanner plugged into my car that tells me my gas mileage, engine RPMs and coolant temperature. It was reading between 210 and 215 degrees. Is that too hot?
 
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Old Oct 15, 2019 | 03:56 PM
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Mine sits between 190 and 205 depending on outside temp.
 
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Old Oct 15, 2019 | 04:25 PM
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It was only 60 degrees where I am today.
 
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Old Oct 15, 2019 | 04:29 PM
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I would expect around 200 for mine with that temp outside. I can't really say for sure about your car, would need to see temps on other days. I'll just say that I'd be curious if mine went that high, but only because I've seen it normally at a lower temp. Have you had the coolant flushed recently?
 
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Old Oct 15, 2019 | 05:14 PM
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I think it was a few months ago.
 
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Old Oct 15, 2019 | 05:35 PM
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Seems a bit high, we are in the 60s here and my odb reads 175-190 on a normal drive. I just installed a new oem thermostat (another issue) so yes your a bit high. At 210 your fans must be running overtime because they kick on at 213
 
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Old Oct 15, 2019 | 07:52 PM
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Oh. Yea I thought it was a little on the high side.
 
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Old Oct 15, 2019 | 08:33 PM
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Pressure test the system, might not be holding proper pressure and have a tiny leak that's venting off steam which is a VERY slow leak but will cause temp issues.

Also if you haven't flushed the coolant in the last 30k it would be a good time to do it.
 
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Old Oct 15, 2019 | 08:33 PM
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215 definitely seems on the high side with that weather. I monitor my temps and dont even see that number in Florida. You sure your fans work properly? There's a low and a high speed
 
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Old Oct 16, 2019 | 07:39 AM
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Coolant was flushed in the last 30k. Also I will check my fans to see if theyre working properly
 
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Old Oct 16, 2019 | 09:21 AM
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crazy because mine is doing the same thing. I had recently changed all my hoses, thermostat, cap, new coolant, etc, roughly 8000 miles ago. I use a scangauge and i have been sitting around 204-207 lately. And it's been cool outside, like 40-55ish. It has me worried. But seems to be running perfect and the stock gauge is where it always has been, just under middle.
 

Last edited by puddin"; Oct 16, 2019 at 04:35 PM.
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Old Oct 16, 2019 | 09:27 AM
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Its weird because the stock gauge is reading normal. Thats what is confusing.
 
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Old Oct 16, 2019 | 09:30 AM
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i feel like we're having the same issue. I've checked for leaks too, i see nothing and my overflow tank is staying the same. soooo, IDK
 
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Old Oct 16, 2019 | 03:21 PM
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I started the car up today. It was idling fine. The temperature went up to 214. I dont think the fans kicked on. Once again the stock gauge said my temp was perfect but the OBD one said it was 214.
 
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Old Oct 16, 2019 | 03:41 PM
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Fans should definitely be at high speed by 214 F.

Perform the IPDM self-test and make sure your fans turn on. It's operation sequence 6 in the list of tests the IPDM will do, it will run the fans at 50% for 5 seconds then 100% for 5 seconds. This will verify the IPDM, relay, and fan motors all work properly.

FSM section PCS, page 10.
 
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