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high idle linked to blower motor


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My wifes 2000 Forester, manual transmission with 175k miles run fine unless the blower motor is on. The idle jumps up to 3000 to 400o rpm and will drop to normal when switching blower off.

As winter approaches running without a heater/defroster is hardly an option.

Any ideas?

rick

w mi.

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Do the headlights dim when you turn on the blower motor?

 

Automotive CPUs are desigend to be very resistant to interference from EMF, but you might give this try. Turn your car radio to an unused spot on the AM band, the FM band will not do. Turn on your blower motor, do you LOTS of VERY loud static?

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Battery voltage hangs around 13.8 to 14.2.

No am radio noise.

Haven't checked what effect the defroster has.

Maybe tomorrow.

How does that figure in the scheme of things?

 

rick

w/mi

 

defroster mode kicks on the AC compressor. AC-compressor-on raises the idle.

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I would inspect the hoses from intake tube to IAC, and from IAC to the thottle body.

 

Idle Air Control valve. IIRC, it's located on the passenger side of the intake. About the size of a sharpie pen, with a couple tubes, and a purple connector.

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