It is not idleing enough when I turn on A/C and heater

Tiny
BADBOYMARCUS
  • MEMBER
  • 1995 CADILLAC DEVILLE
  • V8
  • FWD
  • AUTOMATIC
  • 125,000 MILES
Idle is too low how can I fix this. When I replace my idle speed control do I need to disconnect the negative cable? Does it re-adjust itself? Do I screw the bolt all the way?
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Tuesday, September 27th, 2011 AT 2:22 PM

7 Replies

Tiny
DRCRANKNWRENCH
  • EXPERT
There is a part called an Idle Air Control Valve, IACV. It ups the engine speed as the load increases from accessories.
That is what you need to replace.
It is near the throtle body on the intake manifold.
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Tuesday, September 27th, 2011 AT 2:52 PM
Tiny
BADBOYMARCUS
  • MEMBER
Yea I got that part do I screw the bolt all the way in. And do I disconnect the negitive cable on the battery so it can reset it self
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Tuesday, September 27th, 2011 AT 9:58 PM
Tiny
DRCRANKNWRENCH
  • EXPERT
You can just as an extra measure. Leave it disonnected for at least 30 seconds.
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Tuesday, September 27th, 2011 AT 10:32 PM
Tiny
BADBOYMARCUS
  • MEMBER
Thank you
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Wednesday, September 28th, 2011 AT 12:15 AM
Tiny
DRCRANKNWRENCH
  • EXPERT
You are very welcome. Please come back any time that you need us.
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Wednesday, September 28th, 2011 AT 12:38 AM
Tiny
BADBOYMARCUS
  • MEMBER
Ok I put the idle speed control on and when I turn the car on. It starts to idle its self back and forth. What can I do to fix this problem. It also does it in the mornings.
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Wednesday, September 28th, 2011 AT 10:40 PM
Tiny
DRCRANKNWRENCH
  • EXPERT
Try checking the coolant level and then getting air out of the system.

To bleed the cooling system'
Bleed the cooling system by removing the top cap, that lets the air out, and you can add coolant to the radiator, and bleed it out in that fashion. If you need to bleed your cooling system as a unit, that's an entirely different procedure. That outline is going to be given to your owner's manual, and that depends on where the highest point in the cooling system is, as to what the bleeding procedure is, but for a radiator, as long as the cap is the highest point of the radiator, that's how you'll bleed a radiator. If there's a higher point on there, that can trap air in it, you're going to have to put a bleed valve on there, to let the air out, or the system isn't going to bleed correctly, so if you have to bleed a cooling system, what you're going to need to find, is that bleed valve, and that just depends on whether there's a point in the cooling system, that exceeds the height in the cap of the radiator. Wherever the highest point in the cooling system is, that's where it's going to trap the air, and that's where a required bleed point is going to be, but for most vehicles, a radiator, and a radiator cap, is the highest point in the cooling system, and so the radiators can be bled, just simply by removing that cap, and allowing the system to fill up, until all the air is gone. You need to remember also, that there's a thermostat in the system, and when that's sealed, or in the cold or closed position, it can trap air into the bottom side of the engine, so you want to make sure, anytime you're trying to bleed the system, after you've bled it, you've run the engine for at least fifteen, twenty minutes, make sure it's thoroughly warmed up, and the cooling system has cycled several times, and then recheck it after it's cooled, and re-top as necessary, to remove any additional air, that might have been trapped in the engine, so that's how you bleed a radiator, and/or cooling system."

If this does not fix it, you probably need an Idle Air Control Valve.
Replace and performa the bleeding procedure again.
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Sunday, October 2nd, 2011 AT 3:40 AM

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