a/c fan switch problem- - The 1947 - Present Chevrolet & GMC Truck Message Board Network

into69z · 04-06-2008, 04:12 AM

Once again, I must return to the masters of these fine trucks for some sound advise and shared wisedom! I read recently where someone had a problem with the fan control switch-it would go low, then medium, then back to low-but not high. Can anyone remember the fix? I put in a fresh switch-just r & r'd the heater core -cleaned the evaporater and detailed everything associated with the a/c-heating system. Just can't get the fan to blow on high. I did try the fan directly to the battery prior to install and it turns lots of rpm's hooked directly. This problem did exsist before I started on the project( that's why I had a new Idack switch.....any bells ringing??? help.....Steve

haysonj · 04-06-2008, 04:39 AM

There is a relay on top of the heater box that is probably your problem. It also has a ground that goes from it to the fan motor and a ground that goes from the fan motor to the cowl.

Longhorn Man · 04-06-2008, 05:09 AM

yep, more likely than not, this is the problem

into69z · 04-06-2008, 05:23 AM

I knew you guys had the answer! Thank You Haysonj-i'll get at it in the morning.

04-06-2008, 04:12 AM	#1
into69z "brand new second-hand" Join Date: Feb 2007 Location: White House, Tennessee Posts: 526	a/c fan switch problem- Once again, I must return to the masters of these fine trucks for some sound advise and shared wisedom! I read recently where someone had a problem with the fan control switch-it would go low, then medium, then back to low-but not high. Can anyone remember the fix? I put in a fresh switch-just r & r'd the heater core -cleaned the evaporater and detailed everything associated with the a/c-heating system. Just can't get the fan to blow on high. I did try the fan directly to the battery prior to install and it turns lots of rpm's hooked directly. This problem did exsist before I started on the project( that's why I had a new Idack switch.....any bells ringing??? help.....Steve __________________ Steve 69 3/4t custom camper tilt,am/fm,speed warning,air gauge,buddy buckets,aux battery, big block,p/s,p/b,a/c 67 Camaro 96 Impala ss-sold 04 hybrid Honda-saving gas for the blue truck!:b69:

04-06-2008, 04:39 AM	#2
haysonj Registered User Join Date: Dec 2007 Location: Santa Maria, Ca. Posts: 1,423	Re: a/c fan switch problem- There is a relay on top of the heater box that is probably your problem. It also has a ground that goes from it to the fan motor and a ground that goes from the fan motor to the cowl. Attached Images __________________ 69 Chevy 4x4 383 Power

04-06-2008, 05:09 AM	#3
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,690	Re: a/c fan switch problem- yep, more likely than not, this is the problem

04-06-2008, 05:23 AM	#4
into69z "brand new second-hand" Join Date: Feb 2007 Location: White House, Tennessee Posts: 526	Re: a/c fan switch problem- I knew you guys had the answer! Thank You Haysonj-i'll get at it in the morning. __________________ Steve 69 3/4t custom camper tilt,am/fm,speed warning,air gauge,buddy buckets,aux battery, big block,p/s,p/b,a/c 67 Camaro 96 Impala ss-sold 04 hybrid Honda-saving gas for the blue truck!:b69:



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