Question about 1994 Pontiac Bonneville

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Heat not working

My 1994 bonneville will not blow heat. the radiator is new the thermostat is new and i bled the system. there is no water falling in the car from the heater core but my low coolant light keeps coming on what could it be?

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Do you have to constantly add coolant to this vehicle? Also does it get up to operating tempature?

Posted on Oct 21, 2008

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1 Answer

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Sounds like the thermostat has stayed closed you will need to change it as it will blow the head gasket, very common on this model.

Also when you bled it though you may have left some air in the system this would also stop the heating working, they can be a pain to bleed through keep sqeezing the water hoses as you are bleeding it through and do not bleed it from the lower part of the radiator as it will be hard to get the air out as air will stay at the top, you should bleed from the top.

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Remove and raise upper hose at thermostat end and remove lower rad hose.
Fill rad with a hose and watch for flow from bottom rad hose and/ or bottom rad hose connecton.......water should fall though rad easily.
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Remove thermostat....fill thermostat housing with hose and watch for water flow at bottom rad hose.
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Remove heater hoses.......flush back and forth until a good flow is present "With heater control set to hot" if no or poor flow....replace heater core.

Stop leak can plug everything.

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You have an air pocket in the cooling system. To bled it out you will have to park vehicle on an incline or jack up the front end untill the radiator cap is higher than the heater core. The remove radiator cap and run engine until warm then hold rpm to about 1200 rpm's and top off coolant level until you have no more bubbles.

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