20 Most Recent 1997 Cadillac DeVille - Page 7 Questions & Answers

This engine may possibly have a blown head gasket. You need to have the car block tested with a two stage block tester to see if there are any exhaust gases in the cooling system. (Should be done by someone qualifed).

Either connection is bad to low pressure sensor or pressure sensor is faulty.

It will probably get noisy as the internals have collapsed, they don't have to leak to be faulty.

I am not familiar with Cadillac, however I have not experienced such an option for electrical fans as they are run off of temp sensors. I suggest contacting a Cadillac dealership, or the manufacturer themselves.

To the temperature gauge and to make the coolant fans turn on

You Have to change your water pump

welltere are two ways that this can be done ,One is the professional way that takes about fifteen minutes with a cooling system tester (Tool) and the second way the back woods method that takes about two hours you start with a cool car and take off the radiator cap ,start car and allow to idle to warm up takes like 20 minutes , let idle and and keep addng back any fluid that spills out run for like an hour like that topp off any lost fluid level , put car back on tight and run for at least 30 more minutes , drive car normal or shut off and allow to cool, that should take care of it but is not repeat but allow car to cool off completly 1st

It might not start, it might not pass emissions test, it might not run well.

with the rad cap off run car until its at operating temperature and the cooling fan has cycled and the coolant level is full. run the motor rpm after a while up and down to make sure the level is full.

they kick on about 235 degrees.

Around 260-280.

If the overflow tank doesn't lose fluid and there is no steam coming out of the tailpipe when running then the engine is probably okay after the short period of running hot.

Only if its design limits are exceed, and its happening too frequently.

Not sure what the max temp would be. Info should be in owners manual. Or get online info free at your local library, they have access to online service manuals. Sounds like you may have a bad thermostat. When replacing the rad its a good idea to replace the t/stat at the same time. Large fluctuations in temp can be caused by air in the system. Many vehicles can have a very strange procedure to make sure all the air is out of the system. If yours has you need to follow it as described, otherwise air entrapment will occur and this is one of the results.

Under the Exaust manifolds. Hard to get to the ones near the firewall. May have to acces them from beneath the motor.

Check the waterpump and thermostat. When the waterpump doesn't turn, engine heat is not transported to the radiator. When the thermostat doesn't open once warm the same happens - no engine cooling.

The radiator should be hot op top and cooler at the bottom. If it's cold allover then there's no cooling fluid transport

alternators have only have 3 indications of faults 1 no charge 2 over charge 3 noise With no charge the battery will continually run down and the charge light will be on With over charge there will be a very hot battery and the smell of sulphuric acid with noise it will be a high pitched whistle (brushes) or a rumble from a bearing. This noise can be replicated by a bad water pump bearing, bad ac bearing ,bad idler pulley bearing bad power steering bearing or any other item being driven by the drive belt that has bearings. IT would have helped if you were more specific as to the problems you are having.