Question about 1995 Ford Explorer

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Low rpm's in idle when heating/cooling system is on & surges.

My 1995 Ford Explorer runs ok until I turn on my heating/cooling system. Then Rpm's drop from 600 to 100. When I put the truck into gear the RPM's come up to about 300 and the vehicle surges then RPM's drop and it's safe for me to move forward. This vehicle starts and revs nicely when cold but warm starts present the above problem. I've had my heater blower motor replaced since the system cut out totally but that hasn't solved the surging and low rpm problem. I have to keep the heat and a/c off.
Any idea s anyone?
Thank-you,
L.Hamilton

Posted by on

  • leslieh1 Apr 17, 2009

    Can you tell me why my heating/cooling system seems to be involved?

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Check your EGR or your Idle control Valve. This can cause a problem with your irratic idling

Posted on Apr 17, 2009

  • Jeremy Reddick
    Jeremy Reddick Apr 17, 2009

    When you put your AC or heater on it puts a strain on your motor and will make your motor run about 35 to 50 more RPM. The heater especially draws air from the heat of your engine and if your EGR is saying your engine is not hot enough it will cause these problems. I know it seems wierd but it is true.

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My engine idles up and down ,it gets better as it warms up but still very bad

Posted on Sep 07, 2011

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Try replacing the I A C

Posted on Jul 04, 2009

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Posted on Jan 02, 2017

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SOURCE: engine surging

look for the holes in air intake tube.at the bend

Posted on Oct 04, 2008

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