overheating with AC on, and standing still - Page 2 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 07-21-2006, 01:59 PM   #11
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OK, just trying to eliminate the easier possibilities.

OK to review:

you've just changed the thermostat and coolant,

the radiator seems to be flowing OK (best you can tell),

I would suspect the coolant temp sensor, but it seems to respond to cool down and at speed cooling,

All signs say that you're not getting enough coolant flow while at idle speed.
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Old 07-21-2006, 02:03 PM   #12
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Quote:
Originally Posted by jr's3800
Ahhh ok... Understood...

You know as well as I do( And I get the feeling you understand the cooling system ) There are only a few possibilities that can cause an issue there..

I removed my radiator the other day, I actually used Dex for a long time and then switched to Prestone Longlife... My Radiator finally cracked a plastic tank on the drivers side... I never had a single cooling issue with it... and if I did idle and the fans came on the temps would drop quickly and the fans would shut off as expected..

I'd tell you to try a 180F thermostat but I don't think that will resolve the problem...


Has this always been a problem? Or is this something that has happened recently?
I just bought the car, so i'm not sure. I've only had it for a month. It was a victim of MPOS, moronic previous owner syndrome. The car is really straight, and nice, 106,000 miles. I bought it for $2000.00. It had a broken brake rotor (yes broken, as in the hub spun with the wheel, but the braking surface was always stationary), broken blower tensioner pulley (there was enough left to keep the belt from coming off), no gas cap, broken windshield, and filthy interior. A day with the shampooer and leather cleaner left the interior looking new. Another day detailing the exterior had it looking like new. $25.00 brake rotor and $25.00 pads, gas cap, oil change, belts, and she is a nice car again. But the excessive fuel pressure in the fuel tank, and the AC overheating issue has me baffled.
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Old 07-21-2006, 02:08 PM   #13
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Sounds like you almost have your hands full, but once the overheating issues are figgured out, you'll have a nice car...

The cheapest route to go in right now is the 180F T-Stat just to see if it makes a diffrence at all...

The radiator could be the culprit.. Or the coolant temp sensor could be bad as Lash stated... Do the Fans turn on around 220F?

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Old 07-21-2006, 02:11 PM   #14
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Quote:
Originally Posted by lash
OK, just trying to eliminate the easier possibilities.

OK to review:

you've just changed the thermostat and coolant,

the radiator seems to be flowing OK (best you can tell),

I would suspect the coolant temp sensor, but it seems to respond to cool down and at speed cooling,

All signs say that you're not getting enough coolant flow while at idle speed.
or, I'm not getting enough airflow. That'* why I initally suspected a fan shroud. Maybe my fan isn't pulling very well anymore?
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Old 07-21-2006, 02:14 PM   #15
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The fans do come on at 220*. I wonder if maybe one or both of the fans aren't pulling as fast as they used to?
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Old 07-21-2006, 02:14 PM   #16
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Who did the coolant flush? Also is anything going on with the water pump that you can tell? See if the waterpump pulley moves at all. It may not be flowing the coolant enough, making the car overheat.

As far as the coolant itself, could the mix be off and contain more water than coolant?

Just my .02
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Old 07-21-2006, 02:17 PM   #17
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Quote:
Originally Posted by goertz
Quote:
Originally Posted by lash
OK, just trying to eliminate the easier possibilities.

OK to review:

you've just changed the thermostat and coolant,

the radiator seems to be flowing OK (best you can tell),

I would suspect the coolant temp sensor, but it seems to respond to cool down and at speed cooling,

All signs say that you're not getting enough coolant flow while at idle speed.
or, I'm not getting enough airflow. That'* why I initally suspected a fan shroud. Maybe my fan isn't pulling very well anymore?
Well, true, but I suspect you've already inspected the fan blades for damage and I would guess you've already watched the fans while on to guage their approximate speed.

Other than damaged/worn fan blades or weak fan motor (which I've never encountered. They usually either work or fail completely in my experience), the only other thing I can think of that would decrease airflow is the possibility of damaged cooling fins on the rad.
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Old 07-21-2006, 02:18 PM   #18
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Quote:
Originally Posted by goertz
The fans do come on at 220*. I wonder if maybe one or both of the fans aren't pulling as fast as they used to?
as the engine gets hotter than 220, say 230F do the fans run at high speed?

These cars have a Low Speed and High Speed fan relay, usually they will come on low speed first, then high speed...

when you first turn on the AC ( Say 60F, blower on hi ) the fans should come on low speed then high speed... Do they at any time change speeds?

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Old 07-21-2006, 02:20 PM   #19
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Quote:
Originally Posted by jr's3800
Quote:
Originally Posted by goertz
The fans do come on at 220*. I wonder if maybe one or both of the fans aren't pulling as fast as they used to?
as the engine gets hotter than 220, say 230F do the fans run at high speed?

These cars have a Low Speed and High Speed fan relay, usually they will come on low speed first, then high speed...

when you first turn on the AC ( Say 60F, blower on hi ) the fans should come on low speed then high speed... Do they at any time change speeds?
Oh, DUH!

You may have hit it on the head. I forgot about that...
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Old 07-21-2006, 02:25 PM   #20
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Quote:
Originally Posted by BLACK94SSEi
Who did the coolant flush? Also is anything going on with the water pump that you can tell? See if the waterpump pulley moves at all. It may not be flowing the coolant enough, making the car overheat.

As far as the coolant itself, could the mix be off and contain more water than coolant?

Just my .02
I did the coolant flush. The waterpump appears to be just fine, no noises, leaks, etc. Coolant mix is 50/50.
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