How to bleed the cooling system? - 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 03-22-2003, 05:05 PM   #1
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Default How to bleed the cooling system?

I did a search but didn't come up with anything.
I just put in a 180 Tstat, and filled the system back up. Took the rad cap off, and let it idle till the Tstat opened. Then I keep the radiator topped off, and opened the brass screw on the Tstat housing. Coolant ran out, and I tightened it back up.
Is there anymore to bleeding it?
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Old 03-23-2003, 02:38 AM   #2
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I think you got it...
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Old 03-23-2003, 04:07 AM   #3
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That'll do. Not really necessary, but no harm done. The system will work it'* own air out. I've never found air in that tstat housing.
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Old 03-23-2003, 12:11 PM   #4
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sounds like you got it bled. i personally like to do what you described, then wait for the cooling fan/* to come on, then i crack the bleeder open again just to make sure i got all the air.
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Old 03-23-2003, 05:17 PM   #5
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With the 180 t-stat in and 45ambient temp, I don't think I could get the fans to come on now. At idle, it now stays well below the 200 mark, and I can see on the gauge when the stat opens.
I was just wondering how critical it is on these engines. On my old BMW, it was critical to bleed the air out or you'd crack the head.
THanks!
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Old 03-23-2003, 08:28 PM   #6
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i do that as a precaution, if the fan/* come on, i know that the car is up to full operating temp, and coolant is circulating properly. i also watch the temp gauge as the fan/* come on to make sure it drops accordingly. i don't think the 3.8'* are as touchy, but the 2.8, 3.1 and 3.4'* can be a nightmare from air pockets.
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Old 03-23-2003, 08:45 PM   #7
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i believe the other fan is for when the A/C is going, putting a larger load on the cooling system, and it needs added air flow over the condenser to help with the 'cooling' of the refridgerant.
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Old 03-23-2003, 08:50 PM   #8
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it doesn't come on with the a/c i have tried that on both cars, just to make sure.
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Old 03-23-2003, 08:57 PM   #9
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i think the A/C high side pressure has to be high enough to turn the fan on [i think there is a high pressure switch that is wired to the ecm/pcm], as pressure and temp are directly related, when the pressure exceedes a certain point [ in effect, gets hot], the ecm/pcm cycles the fan on/off. it won't run long [depending on ambient temp, load on the A/C system], but will cycle on and off like the 'regular' fan, just in shorter intervals.
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Old 03-24-2003, 08:30 PM   #10
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you hit it right on the head, slow temp increase is good, rapid temp rise is the result of an air pocket. i see rapid temp rise on the 2.8'* etc. more than on the 3.8.
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