fluctuating temp - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 10-22-2004, 11:39 AM   #1
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Default fluctuating temp

I just put in a new water pump, coolant replacement, hoses, etc. (didn't touch tstat) I never noticed this symtom before.

Symptoms: First run in the morning, 50F outside, 70mph. Temp climbs from dead low to 200 mark then keeps climbing to about half way between 200 and next unmarked tick mark (about 12 o'clock on the gauge). It then hangs there for a minute and then within 15 seconds drops to the 200 mark. After that it climbs to about two needle widths above the 200 mark, hangs there, and then drops to 200.

Is this a sign of a bad tstat? I'm kind of new at this DIY auto repair.

If I do replace the tstat, I don't know if I want to go with the 180F. Can I get half way in between the 180F and 195F by drilling two 1/16" holes in the 195F stat?

Thanks,

Grease
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Old 10-22-2004, 11:40 AM   #2
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is ur cooling fans kicking on?
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Old 10-22-2004, 12:06 PM   #3
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If everything was fine before you started the flush, then it sounds to me like you have a coolant problem. Are your coolant levels full (radiator and bottle) once the thermostat opens (can tell if the thermostat is open by the warmth in the upper radaiator hose...just grab it)?

It sounds like there'* an air pocket trapped somwhere in the system. Bleed down the system using the bleeder valve on the top of the thermostat housing. Start the car, let it warm up, then slightly open that bleeder until fluid starts coming out, then tighten it back down. Then you're sure that all the system is air-free. And make sure the fluid is topped off!

If that'* all good, then you likely have a faulty thermostat.
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Old 10-22-2004, 12:41 PM   #4
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Thanks, guys. I'll check the fans and for air pockets. I've never done the bleed thing before, but I will read up on it.
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Old 10-22-2004, 01:08 PM   #5
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I got kinda the same same problem.....I was running my car last night after I changed the oil, and it was dark out and I noticed that my manifolds were glowing red hot....Is that a good thing? I've never seen that before and was kinda curious. All it was doing was idling for about 10-15 min. I'm not tryin to hi jack the thread....but this just made me think about it.
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Old 10-22-2004, 01:14 PM   #6
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Quote:
Originally Posted by LakevilleSSEi
I got kinda the same same problem.....I was running my car last night after I changed the oil, and it was dark out and I noticed that my manifolds were glowing red hot....Is that a good thing? I've never seen that before and was kinda curious. All it was doing was idling for about 10-15 min. I'm not tryin to hi jack the thread....but this just made me think about it.
Check your cat.
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Old 10-22-2004, 02:46 PM   #7
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Great......gotta spend more money......What am I talking about....I LOVE SPENDING MONEY AHAHAHAHHAHAHAHHAHAHAHA
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