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Old 09-25-2017, 02:03 PM   #1
Carmine

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Default Temp. raises quickly

Hi everyone. Just wondering about something. Like many of you, I've owned a lot of different cars during my lifetime. But, my '71 GTO has me a little puzzled. I've never owned a car whose engine was cold when started, let it warm up 1-2 minutes at the most and took off down the road. No exaggeration, after 3-4 miles, flat road, 50 mph, the engine temp. climbs to 180-190. I know it was hot here yesterday, close to 90 and a little humid, but this happens all the time. This is not the first time. I just don't think this is correct. It stays around 190-195 but in slower traffic yesterday, it inched although never touched, 210. Maybe 205. I hate to compare it to my '62 409, which takes a very long time to reach operating temp., but I've never owned a car that heats up this quickly. Does anyone think this is normal?? Thank you, Carmine.
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Old 09-25-2017, 02:35 PM   #2
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my 07 Silverado does about the same. Doing 45 for 4 miles and just 30 secs warm up.
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Old 09-25-2017, 03:10 PM   #3
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Does it have a mechanical fan clutch? It could be slipping which would cause quick warmup as well as running hotter then the thermostat. .
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Old 09-26-2017, 05:44 AM   #4
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Does it have a mechanical fan clutch? It could be slipping which would cause quick warmup as well as running hotter then the thermostat. .
Yes, a brand new Hayden mechanical fan clutch, but I guess that could be defective also. Just never owned a vehicle that warmed up this quick, Carmine.
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Old 09-26-2017, 11:41 AM   #5
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Those temps don't seem like a problem to me?
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Old 09-26-2017, 02:21 PM   #6
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Those temps don't seem like a problem to me?
Agreed, but I've just never seen temps get that high that quick. Thought it might be indicative of another problem, Carmine.
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Old 09-27-2017, 04:07 PM   #7
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Did a little experiment today, if you want to call it that. Started the car in the garage and let it run until it reached operating temp. of 180 degrees. It only took a few minutes but I wish I kept better track of the time. It was 82 degrees in the garage and a little humid. Idled the engine at about 800 rpm's for a good solid 10 minutes. The gauge never moved off the 180 mark. In much less time then this going down the road, it would have climbed to 190-195. Hmm.....................Not sure how I should interpret this, Carmine.
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Old 09-27-2017, 04:58 PM   #8
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Just thinking out loud here...

Is it possible that there is an obstruction in the radiator core? If you can get your hands on an infrared heat gun (Harbor freight $30.00) you can shoot some surface temps from where the anti-freeze leave the intake manifold and then at various points across the core then back into the pump?

You might also find hot/cold spots on the intake manifold suggesting air pockets inhibiting flow?
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Old 09-27-2017, 05:02 PM   #9
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Has it always done this or this something new? Is the temp sender the right one for the gauge - is the gauge right?
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Old 09-28-2017, 07:18 AM   #10
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Just thinking out loud here...

Is it possible that there is an obstruction in the radiator core? If you can get your hands on an infrared heat gun (Harbor freight $30.00) you can shoot some surface temps from where the anti-freeze leave the intake manifold and then at various points across the core then back into the pump?

You might also find hot/cold spots on the intake manifold suggesting air pockets inhibiting flow?
I have one of those infra red guns and will give it a try. The radiator is a Cold Case brand and new. I replaced the original when it approached 210 degrees and started reaching higher. The new radiator has certainly helped. I would just like to see the temp. a little cooler.

I haven't had the car long enough to learn it's individual characteristics, so I don't know much about this issue from before. The PO told me it never ran hot or overheated. I don't think he was telling the complete truth. The temp. gauge is a new electric AutoMeter which came with it's own sending unit. I don't have any reason to think that it might be defective. I think it might be a good idea to check where the sending unit is in the manifold, with the infra red gun, and compare that to the gauge. I would think they should be right on or very close, Carmine.
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