Question about 1990 Cadillac SeVille

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Diagram for the heater core in a 1990 cadillac deville

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  • Sean Wright
    Sean Wright May 11, 2010

    Do you need it for a seville or Deville? You have a SeVille listed, but asking about a DeVille....let us know.

  • Anonymous Mar 29, 2014

    need to flush and replace heater core (((((NEED DIAGRAM)))))

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I should have the diagram you want. Send me the info on your car and your email address and i will send you what I have. Outdoorsman592003@yahoo.com

Posted on Sep 09, 2009

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3 Answers

My cadillac is not giving me any hot air ,ive replaced the radiator, changed the thermostat, has a new water pump, where do istart to look.


Feel the 2 tubes at the firewall for the heater core. If they are not getting hot, the heater core needs to be flushed out or replaced. I had this problem with a 1990 Cadilac Deville, it was just a plugged up heater core.

Remember to install sealant after flushing out the system to prevent leaks.

Jan 25, 2011 | 1992 Cadillac DeVille

1 Answer

I have a 1990 subaru loyal, it runs fine but there is a problem with the heat. the heat coming from the heater core isnt very hot, its barely warm. the car gets up to running temp and doesnt overheat. when...


A clog can cause low heater perforance in the winter. I had a 1990 Cadillac Deville that had cold air blowing in the middle of winter, and had the system flushed and that solved the problem.

One can feel the two heater tubes at the firewall leading to the heater core to verify whether or not the antifreeze/coolant is getting hot at the heater core.

Good luck on this repair.

Dec 18, 2010 | 1993 Subaru Loyale

1 Answer

Cool air coming from my 1990 deville changed raditor and therm. still luke warm.


try backflushing the heater core,remove heater coolant hoses and flush both ways with a garden hose,do you have a air compressor ,blow water back through heater core both ways,this asuming that all valves are working allowing coolant to flow and all air doors in car are opening,if so this fix has worked many times for me in older cars note works better to hook water hose to hoses or a short peice of hose on heater core,good luck

Oct 01, 2010 | 1995 Cadillac DeVille

1 Answer

How do i replace a heater core in a 1999 cadillac deville


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..

Aug 27, 2010 | 1999 Cadillac DeVille

1 Answer

No heat fog's up inside


Do you want to know if it is the heater core. If you perform a pressure test on the cooling system it will pin point the source. But I does sound like the core.

Jun 01, 2009 | 1991 Cadillac DeVille

1 Answer

Serpantine belt broke


there is usally a diagram on either the hood or the radiator core support. now to loosen something there is a idler pulley with a 3/8" drive end in the center of it that will allow you to move the pulley against the tensioner to put the belt on

Apr 12, 2009 | 1990 Cadillac Deville

1 Answer

1992 Cadillac deville heater bypass


the easiest way to by-pass the heater core is to take off both hoses at the fire wall and use a piece of hard tubing to insert in both hoses and use hose clamps it's quick and easy and should get you by. make sure you top off the coolant and do this with engine cold.

Aug 28, 2008 | 1992 Cadillac DeVille

2 Answers

1990 cadillac deville vacume line mix-up


You can find these vacum diagrams in dealer level emission manuals, or in some Hayes publications, which are avaliable at most public libraries.

Jun 20, 2008 | 1990 Cadillac Deville

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