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No heat could mean several possibilities.
Low coolant level. Check to make sure you have enough coolant -- check the overflow resevoir. Only check radiator when the engine is COLD. NEVER open a radiator cap when an engine is warm or hot.
If you're not sure, with the engine off, squeeze the upper radiator hose with your hand. If it feels warm, and especially if it feels firm or hard, then the coolant is under pressure. DO NOT OPEN the cap until the engine cools off.
If you're really low on coolant and need to add coolant to the radiator, fill it up, then start the engine with the radiator cap off. The coolant level should drop right away.
Add some more coolant. It is usually a good idea to let the engine run until the thermostat opens. This can take a little while...until the engine warms up completely. Slowly raising and lowering the engine speed with your foot on the gas pedal will heat the engine faster. You never have to make the engine race or anything, just a fast idle and then slow it down. The coolant will slowly rise, and may even overflow the radiator a little. Then it will suddenly drop. This means the thermostat has opened. Top it off and put that radiator cap back on all the way. Make sure the overflow resivoir is filled to the right level too.
The engine thermostat might be bad and your engine running too cool.
The heater core might be plugged internally with sediment or externally clogged with dirt, leaves or other debris.
Some cars have a "heater control valve" inline with one of the heater hoses. It is usually vacuum controlled. If it fails you may not get heat. Don't know if your car has one.
There is a "diverter like" door near the heater core inside the heating system that adjusts to let hot air or cold air into the passenger compartment. If this door is stuck, or not getting the proper signal to open, (I think it is vacuum controlled) then you won't get warm air. One of the the vacuum lines under the dash connected to the controller of this door may have come loose.
What else can I help you with?
How do you replace the window regulater on a 89 Cadillac deville?
how do you replace the window regulater on a 89 cadillac deville?
What is the spark plug gap setting for a 89 Cadillac deville?
What is the spark plug gap setting for a 89 cadillac deville?
What engine is in a 89 Cadillac deville?
4.5L V8
Cadillac deville 4.5 v8fireing ordre?
89 cadillac deville 4.5 v8 fireing ordre or timing ordre
How do you tighten tilt steering column on 89 Cadillac sedan deville?
How long does it take to remove a steering column on a 1989 Cadillac Deville
Diagram for 89 cadillac deville?
A person may be able to visit a Cadillac dealership for a Cadillac Deville diagram. An auto parts store may also be able to give out a diagram for the car.
Will an 88 camaro 5 speed transmission bolt up to an 89 Cadillac deville v8?
no dumb$#@
Did the 1979 Cadillac come with a vacuum pump?
NO vac pump in the '79 87&89 Brougham 85-87 deville 89-93 deville 86-86 eldorado 85-87 fleetwood 89-93 fleetwood 86-86 Seville
Intake manifold 4.6 liter 1997 Cadillac deville torque specifications?
the haynes book states 89 in pounds
Need replacement resivor for 89 sedan deville cadillac?
Push OFF and HI together om the climate control panel and hold
What digital dash can you put in a caprice classic a 89?
Perhaps one from a contemporary Cadillac DeVille or Fleetwood may work, those are about the closest equivalents.
Would a 89 Cadillac deville engine fit a 93 Cadillac deville?
Yes it would fit, it is a smaller engine a (4.5L V8 for the '89 vs. the 4.9L for the '93) but would it work with the 1993's transaxle and computer is the question. I am not sure because both engines were similar the 4.9L V8 is larger verison of the 4.5L V8 which was used in Devilles from 1988-1990.
