Question about 1998 Cadillac DeVille

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98 caddy deville nothstar v8 how to replace heater coil have no heat and I'm loosing water somewhere

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The heater core in a 1998 Cadillac is very tricky to replace.
start with getting a pressure test to determine where the exact location of the leak is, it may not be the heater core.
if you do decide to pull the dash apart to change the core make sure the battery is disconnected for at least an hour to allow the airbag system to discharge.

Posted on Oct 11, 2012

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  • Cadillac Master
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You need a haynes repair manual to see all the instrument panel screws location.

Posted on Oct 12, 2012

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Posted on Jan 02, 2017

duane_wong
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SOURCE: no heat on my 98 caddy deville delegance?

The heater core may be clogged up. Or the blend door isn't functioning correctly.

Posted on Sep 20, 2010

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1 Answer

1996 cadillac deville I by passed heater coil but water is coming from somewhere else and is running on floor it's not heater coil and what ever it is its draining my radiator so car over heated


To by pass the heater coil, you must connect the two hoses going into the heater coil. Did you do this? or did you just plug one hose line? best to replace heater coil if it is leaking to get heat working in winter.

Mar 27, 2015 | 1996 Cadillac DeVille

1 Answer

98 caddy deville overheating changed the water pump and thermostat


Run the car without the thermostad to see if it still overheats. If so check the heat sensor it might be faulty.

Aug 01, 2012 | 1998 Cadillac DeVille

2 Answers

I need a vacuum line diagram for a 1984 cadllac coupe deville


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Fig. 31: Vacuum circuits - 1984 V8 4.1L engine Fed. and High Alt. (DFI)


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Fig. 33: Vacuum circuits - 1984 V8 4.1L engine Calif. (DFI)

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Oct 18, 2011 | 1984 Cadillac DeVille

1 Answer

1997 cadillac deville heat or ac wont come on at all. i hear it as if its about to start blowing but nothing comes out. i swear i heard something overheat and make a weird buzzing soud somewhere inside the...


right the heater rad is leaking or a pipe is loose or a tap ,their could be a relay or a control if its clima which is what i suspect if its a caddy ,best one here is to ask a local mechanic to have a look then come back on here to confirm ,very difficult to diagnose without my greasy hands under the bonnet.

Mar 08, 2010 | 1997 Cadillac DeVille

2 Answers

No heat on my 98 caddy deville delegance?


do the heater core coolant supply hoses both get hot at the firewall in the engine compartment? if yes then you have a defective temperature control blend door actuater motor.

Oct 17, 2009 | 1998 Cadillac DeVille

1 Answer

A/C only blows hot air, but compressor is getting cold. What might be the solution? This is on a 1995 Cadillac Sedan DeVille, 4.9 Liter V8 engine. It seems to have a full "freon" charge, because it will...


dear sir
check the compressor efficeincy and output pressor its according to the needs if its not like standerd then compressor need to change .
hope answer the question.
thank you

Jun 09, 2009 | 1995 Cadillac DeVille

2 Answers

98 cad deville is running at 210 degrees


Reverse flush the cooling system and put in fresh antifreeze to -20. (20 below zero). If that doesn't help, replace the thermostat.

Mar 18, 2009 | 1998 Cadillac DeVille

1 Answer

Why does my 98 deville continue to overheat?


check to see if there is a valve (usually vacuum actuated) inline somewhere on the lines that go from the block to the heater core. Maybe it is stuck...

Mar 02, 2009 | 1998 Cadillac DeVille

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