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1. full coolant level? no? fill. 2. fans come on around 190-200 degrees? no? replace sensor switch. 3. check for worn/ slipping water pump belt. replace 4. radiator holds pressure? no? have leak/pin hole in radiator fixed. 5. heater puts out hot air? no? thermostat possibly stuck, replace. 6. high mileage? possible water pump failure, disconnect top radiator hose at radiator, start car, water starts pumping out of top hose? no? replace water pump. (Also good test for stuck thermostat, if stuck, valve to radiator is shut off = no flow to radiator) 7. If not any of above, check for oil in water or water in oil (in oil it will make oil look kinda milky brown)this is possibe blown head gasket from overheating, take to mechanic for diagonstic of exhaust gasses in coolant. entire powertrain has to be dropped from under car to get to timing cover in order to remove head to replace gasket. VERY EXPENSIVE. consider selling car.
What else can I help you with?
How do you set the timing on a 1998 Cadillac Deville?
how do i set the timing on a 1998 cadillac deville 4.6
Why is your 1998 Cadillac deville alternator?
Why is is 'What?'
How do you replace a 1998 Cadillac deville power antenna?
how do you replace power antenna on 1988 deville
Can you fit 22 inch rims on a 1998 Cadillac deville d'elegance without modification?
can 22's fit on a 1998 cadillac deville without modifications?
Where is the blower motor relay on a 1998 Cadillac deville?
A 1998 Cadillac Deville does not have a blower relay. The system has a fuse and a controller to feed power to the blower motor.
Will the electric fans stay on after you turn engine off on a 1998 deville 4.6L?
will the electric fans stay on after you turn engine off on a 1998 deville 4.6L
Does a 1998 cadillac deville have all wheel drive?
No
How do you replace the tailight out of a 1998 Cadillac Deville?
To replace the tailight out of a 1998 Cadillac Deville just remove the fuse and place a new one in the light\'s bulb.
Where is transmission fluid dip stick at in located 1998 Cadillac deville?
where is the dip stick at located in 1996 cadillac deville ?
How do you change a 1988 Cadillac sedan deville headlight switch connector?
how do you take out a headlight switch's in a 1998 cadillac deville?
Where is the Voltage regulator on 1998 Cadillac Deville?
inside the alternator
How can you fix the speedmeter on 1998 cad deville when it went out?
replace it
