Question about 2002 Cadillac Deville

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Blows cool air with thermstat set to 90. head gasket, water pump and thermostat recently replaced. No heat.

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  • amihelping May 11, 2010

    have you verified that the heater core isn't damaged?

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Did you have heat after all the work that was done?

Posted on Sep 29, 2009

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2 Answers

Will removing my thermostat help keep my car from overheating until I can get it into the shop?


removing the thermostat is a sure recipe for overheating as it allows the coolant to circulate too quickly to allow the heat top transfer to the air
have a compression test done to check for head gasket
The power steering pump failure would not cause a water pump seal to fail so I suspect that you were "had" there
check that the coolant level is at the radiator cap . You may have to bleed any air out of the cooling system as that will cause overheating and no heater hot air.

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sounds like you have a head gasket gone bad. these cause overheating and the compression gases cause the air in the system and to boil out of the system. as such will cause the heater not to blow hot air, as steam will contain heat very long. the white smoke upon start up is a tell tale sign that the gasket has blown and needs replacement. have a head gasket test done. it could also be a cracked head or even a block, but head gaskets are a problem.

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Did you bleed the air out of the cooling system?? This is a must or it will overheat.

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1 Answer

96 Firebird, Replaced water pump, fuel pump - Now blows head gasket.


Get yourself another mechanic. This guy is not doing his job. It shouldn't cost $1600 to change a water pump and fuel pump. No proper mechanic would remove a thermostat to replace the O-ring and put the old thermstat back in. It wouldn't be uncommon for the coolant level to drop after changing the thermostat. It probably only needs to be topped up. No, the motor doesn't have to come out to replace the head gasket and I don't see it costing $2500. Before you spend any more money there, take the car somewhere else and get another opinion. I bet that if you fill up the coolant bottle for 2 0r 3 days it will stop losing coolant. Hope this helps.

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If you had a crack in your head you should be losing water inside/outside the engine, the same with a head gasket, check for water running down the outside of block and the exhast for excess water discharge, I know will sould stupid but did you insert the thermostat in the correct way? spring facing downwards?. The only other thing i can think of is if you have a collapsed rubber hose somewhere.

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No heat


the thermostat may be stuck open, not allowing the the water in the radiator to warm up, or you may have a bad exchange on the dash that won't allow you to turn it from cold to hot.the resevoir is called an overflow resevoir.when the coolant heats up it expands and flows into there, when it cools back down it uses the coolant from the resevoir.

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1 Answer

My 91 cadillac devile has no heat , just cool air blows even when


The heater in your car depends upon a flow of hot coolant going through the heater core in order to get hot air into the car. If the heater core is partially plugged, it will restrict the flow. If you have a head gasket that is putting exhaust into the cooling system, it will eventually get into the heater core. When this happens there is no coolant in the heater core to make the air warm. If the water pump vanes have corroded away the result will be very poor coolant circulation causing the heater to not blow hot air. If your car is equipped with a heater control valve that is not functioning properly, the coolant flow will be restricted. One or a combination of these factors is likely the culprit in your case.

if the car is not overheating, the thermostat is working fine.... replace or flush the heater core multiple times to try and eliminate sediment build-up.

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The blowing of air into the coolant resevour is caused by a leaking head gasket. What's happening is the cylinder is blowing air into the cooling system causing this to happen.

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