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Old 04-28-2014, 07:16 AM   #1
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P-30 dashboard fan switch

My heater/air conditioning fan switch only works on high; nothing on the three intermediate speeds. I have the three volume GM factory service manual set, but can't find any reference to the fan switch or any resisters that might produce slower fan speeds. A long search of many fan switch specifications at the local auto parts store didn't find any replacement switches.

Has anyone had this issue, and found a solution? (maybe the resisters are integral with the fan motor assembly, but I haven't examined this yet).
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Old 04-28-2014, 09:29 AM   #2
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You will have a resistor I think it has 5 wires usually silver about 1 by 2 inches the older ones had contacts or coils of wire
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Old 04-28-2014, 01:48 PM   #3
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You may have the Evans system...some parts here:

https://comfortairgr.com/product-cat...rome-rv-parts/
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Old 04-28-2014, 02:02 PM   #4
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My chassis is a P30 but my heater control is from a Chrysler minivan. The dash wasn't part of the chassis so the body builders used what they wanted.

The resistor pack is a good place to start, it should be visible from the outside heater housing. High speed bypasses the resistors, when it is the only speed that operates that's a good indication of your problem. It could be as simple as corrosion, check the connections.
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Old 04-28-2014, 07:51 PM   #5
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Whoops...I thought all the early Chevy P30's used the Evans add-on units...it's what I have.
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Old 04-29-2014, 06:11 AM   #6
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Yep, I have an Evans system. Thanks for the link. Both the fan switch and blower resister are available. Now I gotta find the resister location so I can test it.

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Originally Posted by dwhit View Post
You may have the Evans system...some parts here:

https://comfortairgr.com/product-cat...rome-rv-parts/
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Old 04-29-2014, 06:24 AM   #7
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Quote:
Originally Posted by George Schweikle View Post
Yep, I have an Evans system. Thanks for the link. Both the fan switch and blower resister are available. Now I gotta find the resister location so I can test it.
It is usually mounted to the air plenum with the resistors recessed into the airstream .... generally near the fan squirrelcage.
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