How do you drain coolant for 1998 cadillac deville

Sounds like it's time for Head Gaskets

The fans /fans are turned on by the pcm, using input from the coolant temp sensor, as well as the HVAC system. The cts is on the right rear of the engine below the egr valve.

Hi.

Here the replacement part: 1998 Cadillac DeVille Coolant Reservoir - Partstrain.comLet me know if you need anything else.

Regards.

Ginko.

The only other things would be the coolant temp sensor or the engine computer. Alot of the new GM's have the on and off function of the cooling fans controlled by the computer. If the coolant temp sensor is ok, then most likely the problem is in the engine computer.

the coolant reservoir has a black cap with an orange label affixed to it.. Unscrew it many times to remove & fill about 3/4 ways up

Check for possible leak. Also check the radiator cap. Inspect the rubber seal for signs of deterioration. Look for signs where coolant had been escaping which would have coolant stains on them.

lower radiator has a petcock just losen or you can always losen and remove lower radiator hose.

where can locate the engine coolant temperture sensor.

try taking off your fuse panel cover, there should be a reset button in there.

on the radiator on the drivers side bottom, there is a pedcock vavle