Question about 1999 Cadillac DeVille

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Where is fan fuse on 99 cadillac deville. Both of them were not on when my caddy overheated

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  • Cadillac Master
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There are two: the 10A A/C COMP FUSE in the engine compartment fuse/relay center and the 50A COOL FNS FUSE in the right maxi fuse block.

Posted on Dec 13, 2016

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Posted on Jan 02, 2017

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SOURCE: 99 cadillac deville engine overheating an loosing

Check to see if you have flow through the entire radiator.If part of the radiator core is cool to the touch when the engine is at operating temp, this indicates restricted radiator flow. If the entire radiator core is not allowing water to flow through, cooling will not be at all efficient. Also a good idea would be to purchase a block tester. available at napa and other reputable parts houses for around thirty dollars. You remove a small amount of coolant, and put the tool in the radiator, or pressure tank opening. If there are any combustable gasses present, i'e' exhaust, this would indicate a head gasket breech, (or maybe worse) and would indicate that it's time to stop looking for a simple problems, and get proffessional help. Good luck to you!

Posted on May 12, 2011

Kravcar
  • 192 Answers

SOURCE: Engine overheating in 1999 Cadillac Deville.

The most common overheating problem with the Northstar engine is a blocked purge line(small hose).The purge line is designed to purge air out of the cooling system.
There is a small diameter hose coming from near the top of the coolant tank (not the cap) ,this is the purge line.
With the engine idling,pull the purge line from the tank,if there is no coolant flow from this small hose,it is blocked and this will cause overheating.
If the hose is clear, check for blockage at the nipple on the tank.Or trace the hose back until you find the blockage.
The hose goes in to the engine to a crossover and comes out the other side close to the thermostat housing,the blockage may be there.

Also note that the cooling fans don't come on until the coolant temperature hits around 225 degrees.
During normal highway driving the fans will very rarely come on(if at all) due to constant air flow through the radiator.They will only usually come on in heavy traffic conditions on a hot day.
But......if you have the Air Con switched on, the fans will run all of the time.

Posted on Jun 02, 2010

  • 1 Answer

SOURCE: overheating,eveything looks ok.

I have a 97 Cadillac Deville with a northstar engine and have replaced it twice so far, so i answer this by experience...i've noticed to my two prior engines that went bad that the normal temp should NOT EXCEED 228 (normal), the red overheating light will come on at 250 and at 260 it will beep and tell you to stop engine - idle engine and will begin to smoke (overheat).

I hope this helps you and anyone else...by the way if your asking why did i replace my engine twice is simply because my cadillac is super clean inside and out, immaculate condition.

Posted on May 16, 2009

  • 1 Answer

SOURCE: How Do I remove the door panels in my 94 cadillac deville concours?

u have to remove the panel that has the door handle in it, remove the panel which has the window and the seat adjusters, unplug the wires and just lift the door panel and there u are.

Posted on Oct 16, 2008

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Overheating its a 2000 caddy deville


Hello flood_tim and thank you for asking your question, on Fixya.

Here is a simple process that will walk you through a few steps that will pinpoint the overheating problem on your 2000 Cadillac DeVille, without even using any tools. It has helped millions of people, and I am certain that it will help you, because I wrote it for people like you. So here is the link to:
How to diagnose an overheating Cadillac engine

Anyways if that helps you any little bit, then feel free to follow me on Twitter. That one is at: twitter.com/acoates23234

Thanks for the vote, and good luck!

Jul 06, 2010 | 2000 Cadillac DeVille

1 Answer

I have a 99 Cadillac Deville which is overheating and I think it is the thermostat. Can I do this myself? Is it easy to get at? I do have some mechanical skills.


you need to make sure the fans are turning on to cool the engine down first,the fans won't kick on until the coolant reaches 212 degrees ,make sure your not losing coolant ant radiator is full,check it when the engine is cold,the north star engines have a flaw in the head gaskets leaking,

Jan 04, 2010 | 1999 Cadillac DeVille

1 Answer

Looking for the fuse panel that operates back windows of 99 cadillac deville


it sould be under the back seat but i have fixed a few caddys where the back windows wont work it was the wires in the door jam in the rubber boot the wires broke in half from opening and shutting the door

Aug 17, 2009 | 1999 Cadillac DeVille

2 Answers

Overheating at idle


That's because cadillac replaced it with an upgraded switch. to find out if your relay is bad bypass the relay and directly jump the fans to find out if the fans still work. if you don' know how to do this find a friend that does.

Jul 05, 2009 | 1999 Cadillac DeVille

1 Answer

My 96 caddy


make sure you cheak the fuses they should be under the dash by your feet(i have a 1993 deville and the fusebox is by the E-Break) if any look burned either replace them with the EXACT same model (the wrong fuse might cause a fire) if you're not sure have someone else do it

May 05, 2009 | 1996 Cadillac DeVille

1 Answer

A/C fan does not work


The automatic fan speed control, self test the auto ac control center for fault codes.

Aug 31, 2008 | 1995 Cadillac DeVille

3 Answers

99 cadillac deville


hello i have a 1998 cadillac deville course. an i been having the same over heating problems with mine i been taking it to mechanics an no one seems to know even the caddy dealship its overheating i checked the termostat water pump radiator all hoses was wondring could you tell me what you did or what you are doing to fix your problems my email is teree1234@yahoo.com thank you very much

Aug 02, 2008 | 1999 Cadillac DeVille

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