overheating - Pontiac GTO Forum
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post #1 of 25 (permalink) Old 05-05-2013, 06:31 PM Thread Starter
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overheating

Howdy all. While on our way to the big city to stock up on good sippin' Bourbon.....I saw my temp gage go from slightly below 1/2 and go to 3/4 hot. We stopped to eat and continued our journey......a dozen more miles into our freeway ride at 60-70, and going up and down some gradual miles long ups and down, the needle was just about pegged full when we pulled into a rest area..... after 1/2 hour it had cooled off a tad and we turned around for home.....all the way home, like 30 miles, it ran 2/3 to 3/4 hot.....
In the past it has never really rose above 1/2 way?
Im thinking thermostat?
The fluid was and is fine...
thanks as always
Tk
(pours a round of Elijah Craig for all)
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post #2 of 25 (permalink) Old 05-05-2013, 07:03 PM
 
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I agree. It sounds like the thermostat is stuck open.

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post #3 of 25 (permalink) Old 05-05-2013, 08:51 PM
 
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Thermostat is stuck almost closed, reducing flow through it. I had a failsafe that failed, I will never use those again. Replace the stat and see if it's cured.

Burning rubber since 1982!!
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post #4 of 25 (permalink) Old 05-06-2013, 09:47 AM
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post #5 of 25 (permalink) Old 05-06-2013, 09:47 AM
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Elijah Craig? Crap, now I'm gonna have to google that one, too. Yes, verify that it is, in fact, running warmer. Borrow a pyrometer or buy one at Harbor Freight and see what your actual temp is. I had a '66 GTO that 'overheated' for ten years. Found out that when I fixed the bad ground to the dash cluster, the needle went right back down to 185. These old gauges ain't always reliable. Have you tried Bookers? That one will burn the hair off your chest!
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post #6 of 25 (permalink) Old 05-06-2013, 02:12 PM Thread Starter
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Havn't tried Bookers....yet..........but walking by the car after we stopped ya could feel the heat bigtime........thanks folks!
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post #7 of 25 (permalink) Old 05-06-2013, 02:53 PM
 
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When I was questioning my gauge accuracy, I bought an infrared thermometer. Whenever I was concerned, I got out, opened the hood and checked the inlet of the radiator. BTW, those infrared thermometers work best if pointed at a black object.

When the only tool in your toolbox is a hammer, you tend to see every problem as a nail.
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post #8 of 25 (permalink) Old 05-06-2013, 03:52 PM
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Never had an issue with overheating in like 18 years of owning mine....until today. Just a few blocks from home and the temp light comes on. hit the thermostat housing with the Lazar temp gun and *231. Just ordered a *180 thermostat and gasket.
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post #9 of 25 (permalink) Old 05-06-2013, 08:08 PM
 
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heat

I thought that the light didn't come on until it got to like 240+? If that's the case, I'm going to hook my light back up, seeing as how I never boil over. I can't stand looking at that gauge, anymore!
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post #10 of 25 (permalink) Old 05-06-2013, 08:58 PM
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LOL, so I get the parts and wait for it to cool off, and then find out it's a gal and a half low on coolant. Whoops, should have checked it.
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  Pontiac GTO Forum > The 1964-1974 Pontiac Tempest, Lemans & GTO > 1964-1974 Tempest, Lemans & GTO General Discussion

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