Wear is the heater valve located in a 95 cadillac deville

Usually they are located behind the glove box.

Hello: On the passenger side, Behind the glove box on top of the heater case is the Body control module, From underneath (passenger side) along side of the Programmer is the Engine control module. There is no one main ECU. This information applies to the sedan devilles with the 4.9 engine

probably your heater control valve. below is a replacement from autozone, but yours may look different. If it isn't the control valve, maybe it's a splice someone put in. The control valve is the only thing that comes stock in the heater hose.

The fan assembly is under the glove compartment. Remove cover[3 scews] unplug electrical connector. then remove the 3 bolts that hold the fan assembly in the housing. take motor apart and clean check brushes in brush holder, then sand the armature where the brushes ride. Stretch spring on brushes , the put the motor back together. works 95% of the time.

Is this during idle or while driving ? My older GM cars were prone to collapsed hydraulic valve lifters....usually from wear or lack of oil pressure to the lifters while idling.
If you hear this only while driving or accellerating.... it's likely a spark knock sound (Engine internal damage likely if you leave this situation unchecked) It may be a 'timing' problem. Get help soon !

Hello,

Here is detailed solution on how to replace the heater core in the 1999 cadillac deville;



STEP 1 Disconnect the negative battery cable.


STEP 2. Drain and recycle the engine coolant.

STEP 3. Disconnect the heater core hoses using tool J-37097 or an equivalent.

STEP 4. Remove the right side sound insulator and the glove box module.


STEP 5 Remove the programmer shield, if equipped, and disconnect the air mix valve link.

STEP 6 Disconnect the programmer vacuum and electrical connectors.

STEP 7 Remove the heater core cover, leaving the programmer attached.


STEP 8 Remove the heater core retaining screws and the heater core.



have a nice day..

check fan fuses and relays. is the idiot light coming on . stop engin temp. if its coming on unplug it . its located behind the rear valve cover in the middle. if that isnt it replace temp sensor. located below the air breather.

i dont remember the 95 caddy with pressure monitors id say try your valve stems or the valves themselves to make sure that they are tight. replace any stem caps that are missing.

The idle may be to low or the motor is just old and a new set of rod bearings is need with an oilpump to bring the pressure back up.

the vehicle speed sensor is located on the top of the transaxle on the passengers side. look for wires on top of trans axle on passengers side.if more problems finding it let me know.