blower fan cuts out on high speed setting - The 1947 - Present Chevrolet & GMC Truck Message Board Network

c10 custom · 06-06-2016, 12:34 PM

Hi everybody i am having an issue with a 1984 gmc jimmy
The blower fan works but cuts out when turned to high speed setting
The blower motor resistor has been replaced and the fan relay
any help on this would be appreciated greatly Thank You

05duramaxhd · 06-06-2016, 01:13 PM

had this happen to my K10 after fatmat and new seals, had to crack the window before it would work on high.

How is your interior?

ironroad9c1 · 06-06-2016, 01:20 PM

Bad fan switch? The resistor is bypassed on High.

skeet85silverado · 06-06-2016, 04:17 PM

take your level that controls your air and heat and move it over just lil towards heat. just a tad bit.

tucsonjwt · 06-07-2016, 05:30 PM

Remove hvac control assembly from the dash and operate the control with the engine on. Wiggle the connector at the back of the hvac control and see if it will operate correctly, at least momentarily. If you can get it to work this way, then buy a new short harness with connector - they are still available from the AC Delco pigtail catalog. The connector/harness dries out over time and will not keep good contact with the hvac control.

06-06-2016, 12:34 PM	#1
c10 custom Registered User Join Date: Aug 2011 Location: Lethbridge Montana Posts: 259	blower fan cuts out on high speed setting Hi everybody i am having an issue with a 1984 gmc jimmy The blower fan works but cuts out when turned to high speed setting The blower motor resistor has been replaced and the fan relay any help on this would be appreciated greatly Thank You

06-06-2016, 01:13 PM	#2
05duramaxhd Registered User Join Date: Jan 2013 Location: Newalla, OK Posts: 600	Re: blower fan cuts out on high speed setting had this happen to my K10 after fatmat and new seals, had to crack the window before it would work on high. How is your interior?

06-06-2016, 01:20 PM	#3
ironroad9c1 Master Hater Join Date: Apr 2006 Location: Temple,Tx. Posts: 402	Re: blower fan cuts out on high speed setting Bad fan switch? The resistor is bypassed on High. __________________ 1997 C1500 ECSB 4.3/NV3500 8.5 3.42 "This evening, all of you bleeding hearts... why don't just go ahead and hug yourself for the next 20 minutes or so, because there's a really good chance you're gonna be offended".- Captain Owen Honors

06-06-2016, 04:17 PM	#4
skeet85silverado Registered User Join Date: May 2004 Location: warner robins ga Posts: 158	Re: blower fan cuts out on high speed setting take your level that controls your air and heat and move it over just lil towards heat. just a tad bit.

06-07-2016, 05:30 PM	#5
tucsonjwt Registered User Join Date: Jul 2007 Location: Tucson, AZ Posts: 3,189	Re: blower fan cuts out on high speed setting Remove hvac control assembly from the dash and operate the control with the engine on. Wiggle the connector at the back of the hvac control and see if it will operate correctly, at least momentarily. If you can get it to work this way, then buy a new short harness with connector - they are still available from the AC Delco pigtail catalog. The connector/harness dries out over time and will not keep good contact with the hvac control.



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