Question about 1999 Cadillac DeVille

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Where is the idle control valve on the 1999 Cadillac De Ville and is it the same thing as the idler motor?

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The IAC or idle air control valve is mounted in the throttle body and uses an air passage that opens or closes to increase idle speed where as an idle motor usually pushes against the throttle plate to increase idle speed most idle motors (stepper motors) where phased out and was never used on port fuel injected engines chances are you have an IAC valve

Posted on Dec 11, 2012



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Posted on Jan 02, 2017

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SOURCE: what is the correct temp on a 1998 Cadillac DE

The normal coolant temp should be around 200-215 degrees.
The cooling fans will come on at around 225-228 degrees.

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.

Posted on May 22, 2010

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SOURCE: Show routing diagram for serpentine belt for a

CLICK on the following LINK. It has all the Diagrams for your Belt that you will need.
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Posted on Feb 28, 2010

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SOURCE: 99 cadillac de ville

the coolant temp sensor is at the rear of the engine and is a "bad word" to get to. the 3 relays are at the bottom,under the fans. if you remove the driver side fan out of the way( 2 10mm bolts holding the fan) you should have good access to them. they do have locks on them and may be tricky to unplug. there is a 7/16 nut holding the relay plate down. remove and it should be easy to remove them.

Posted on Jul 09, 2008

  • 413 Answers

SOURCE: Turn signal flasher fuse location

it is normailly the big round thing in the fuse panel on the driver side under the dash by where your feet go

Posted on Dec 30, 2008

  • 112 Answers

SOURCE: how hard is it to change the water pump belt on a

Please remember to leave feedback and vote. Good Luck


  1. Install a 1/2 inch drive extension into the belt drive tensioner (6).
  2. Push down on the extension to release tension.
  3. Remove the drive belt from the power steering pump (13
  4. Slowly return the tensioner to the original position.
  5. Remove the belt.

  1. Thread the drive belt through all the pulleys except for the power steering pump (1) and the drive belt tensioner (6).
  2. Insert a 1/2 inch drive extension into the drive belt tensioner.
  3. Push down on the tensioner and feed the belt around the tensioner wheel.
  4. With the tension applied, complete the belt routing. Make sure the belt is properly seated in all pulleys.
  5. Slowly return the tensioner back to its original position. This will apply tension to the drive belt.
  6. After installation, check the belt for proper seating on the pulleys, proper routing and alignment.
  7. Start the engine and check for proper belt and accessory operation.


Posted on Jan 20, 2011

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1 Answer

Cant find freez plug for 1999 cadillac davill

Hello rogelioma758: My name is Roger and I will help you. The 4.6 engine used in the 1999 Cadillac De Ville does not have freeze plugs. This was a cast aluminum engine and had no freeze plugs. How ever if you are trying to install a block heater? This engine was made to have a external heater that bolted to the block itself. Should you need further help please just ask. Please rate the answer. Thank You for using Fix Ya. Roger

Feb 08, 2011 | 1998 Cadillac DeVille

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Feel the hoses going to heater core, one should be hot and the other warm. If one is cold or both are then heater core is clogged. Make sure heater control valve works and as vacuum to it and or the cable is free.

Jan 16, 2011 | 1976 Cadillac Deville

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1989 Cadillac Sedan De Ville engine stalls when air is turned on...tries to take off when stopped at stoplight..sometimes dies while driving..

It sounds like the idle compensation circuit for the engine is dirty or faulty. Have your car checked at a shop. have them check the idle air motor for dirt or malfunction. It could be that it only needs to be cleaned or replaced.

The compensation circuit adjusts the idle/slow speed of the engine. The air conditioner puts a load on the engine and this circuit adjusts the engine speed to compensate. Also, when the car is cold this circuit adjusts the idle speed to prevent stalling and help the engine warm up faster. I hope this information helps you.

Aug 16, 2010 | 1989 Cadillac Sedan DeVille

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Air and heat will only come out defroster on 2001 Cadillac De Ville

There is an actuator motor that controls this,and it is most likely not working,the actuator motor needs to be replaced,and the dash has to be removed to access the motor.

Jul 15, 2010 | 2001 Cadillac Seville

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Need to locate thermostat in 99 Cadillac De ville 4.6L

it's in the thermostat housing that is close to a belt driven water pump on the driver's side. Thermostat is hidden inside this housing.

Jun 25, 2010 | 1999 Cadillac DeVille

2 Answers

Have codea 12-19-30-41-52-91 f10-32 please help the car i have is a 1990 cad sedan de ville 4.5 engine

ECM Trouble Codes
12-Distributor signal fault
19-Fuel pump circuit fault (short)
30-Idle speed control (isc) motor rpm out of range
41-Camshaft position sensor (CMP) or circuit fault
52-Electric control module (ECM) reset
91-Park neutral position switch or coicuit fault

BCM Trouble Codes
10-Outside temperature sensor or circuit fault
32-Electronic control module (ECM) to Body control module (BCM) fault loss of communcation

Source: Haynes repair manual

Dec 11, 2009 | 1990 Cadillac Deville

2 Answers

1994 Cadillac De Ville acts like vaporlock

change fuel filter and check fuel pressure.sound like low fuel pressure problems.

Jun 07, 2009 | 1994 Cadillac DeVille

1 Answer

Idle control system

A quick trip to the dealer would confirm but it sounds like your I.A.C. (idle air control motor) may be broken. I don't remember it being too expensive when I replaced it on my 95 caddy de ville. Also check out these symptoms-
Is your car idling properly?
Does it get rough under load or other conditions?
Any idle or off idle irregularities at all?
If so these symptoms may be linked to the I.A.C.

Mar 31, 2009 | 1997 Cadillac DeVille

1 Answer

1988 de ville

if your EGR valve is stuck open its adding "false" air into the cylinders.  (just like a vacuum leak)  the engine will raise its idle speed to prevent the engine from stalling at idle.  the EGR should not be open at idle.  

Jan 26, 2009 | 1988 Cadillac Sedan DeVille

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