Resistor-Dumb question - The 1947 - Present Chevrolet & GMC Truck Message Board Network

treefrog · 08-30-2003, 09:26 AM

I pulled the heater/AC control to replace the fan switch. I also replaced the relay behind the glove box. Vendor said to replace the resistor at the same time. Where is it? Told you it was a dumb question. TF

**68 Stepside** · 08-30-2003, 02:19 PM

I *think* the resistor he is referring to is the three-pronged thingamabob on the heater/ac box. But I could be wrong.

TTT

jef5150 · 08-30-2003, 02:47 PM

??

treefrog · 08-30-2003, 04:46 PM

Jeff 5150, Any chance that has 2 blue and 2 yellow wires on the plug? If so, it's inside the box, no wonder I couldn't find it. Tfrog

GMC Jim · 08-30-2003, 09:30 PM

per 1971 GM Manual.....the resistor pack has 3 wires....Dark Blue; Light Blue and Yellow.......

**kwmech** · 08-31-2003, 12:26 AM

The resistor controls the fan speeds, if you are replacing the switch because of melting connectors there is too much resistance in the blower motor itself, thus creating heat.

treefrog · 08-31-2003, 07:00 AM

Thanks to all, class 69 GMC Jim, 5150 et al. Unfortunately I got the duct work apart before I go the last post, but I'll change it while it's on the floor now. Thanks for the directioin and for the drawing. I owe you. TF

08-30-2003, 09:26 AM	#1
treefrog Registered User Join Date: May 2002 Location: Knoxville, TN USA Posts: 189	Resistor-Dumb question I pulled the heater/AC control to replace the fan switch. I also replaced the relay behind the glove box. Vendor said to replace the resistor at the same time. Where is it? Told you it was a dumb question. TF

08-30-2003, 02:19 PM	#2
68 Stepside huh? Join Date: May 2000 Location: Washington, Illinois Posts: 5,692	I think the resistor he is referring to is the three-pronged thingamabob on the heater/ac box. But I could be wrong. TTT __________________ Someday when I'm lonely, Wishing you weren't so far away, Then I will remember Things we said today. RIP El Jay

08-30-2003, 02:47 PM	#3
jef5150 Inline 69 Join Date: Apr 2003 Location: valleysprings,california Posts: 1,018	is this the"thing-a-mabob" ?? Attached Images

08-30-2003, 04:46 PM	#4
treefrog Registered User Join Date: May 2002 Location: Knoxville, TN USA Posts: 189	Resistor Connection Jeff 5150, Any chance that has 2 blue and 2 yellow wires on the plug? If so, it's inside the box, no wonder I couldn't find it. Tfrog

08-30-2003, 09:30 PM	#5
GMC Jim Senior Member Join Date: Dec 2002 Location: Portland, Oregon Posts: 901	per 1971 GM Manual.....the resistor pack has 3 wires....Dark Blue; Light Blue and Yellow....... __________________ '71 GMC;fleetside;PB/PS/AC/CC/402 Eng./Custom Paint/110,000act miles/3 fuel tanks(52gal).

08-31-2003, 12:26 AM	#6
kwmech Senior Member Join Date: Mar 2003 Location: Colfax-California Posts: 8,480	The resistor controls the fan speeds, if you are replacing the switch because of melting connectors there is too much resistance in the blower motor itself, thus creating heat.

08-31-2003, 07:00 AM	#7
treefrog Registered User Join Date: May 2002 Location: Knoxville, TN USA Posts: 189	I found it Thanks to all, class 69 GMC Jim, 5150 et al. Unfortunately I got the duct work apart before I go the last post, but I'll change it while it's on the floor now. Thanks for the directioin and for the drawing. I owe you. TF



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