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1998 Bonneville

NeedHelp5's Avatar
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05-23-05, 06:07 PM   #1  
1998 Bonneville

My 1998 Bonneville, A/C is not cooling like it should.
A/C is fully charged but is not cycling.
Does it have heater shut off valve? Does it have a vacuum, if so where is located?
It appears the water heater coil is not shutting off. Any clues?

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Join Date: Nov 2003
Posts: 1,147

05-24-05, 06:09 AM   #2  
coolant flow all the time...

...in the heater core is normal. air is cooled first and then reheated as necessary. if the ambient air temp is cool or mild and the compressor doesn't cycle (assuming it did in the past because GM does use a variable displacement compressor on some vehicles that doesn't cycle), then it sounds low on refrigerant. do this...identify the ac lines where they go into the evaporator and touch them with your hand while the system is operating. they should be cold and they should BOTH be very close to the same temperature. if it's low...the one at the bottom will be cold and the one at the top will be cool. if they are both ice cold...frosty even...you don't have a refrigeration problem...it's more likely a blend door problem inside the car.

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