heater problems..help - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Silence86 · 10-30-2009, 09:26 AM

ok so on my 86, the heater only really works when im driving...when i come to a light, kinda stops. this really sucks cause this morning i needed to use my defrost and had to roll with the window down freezing my a off...help please

**old Rusty C10** · 10-30-2009, 07:17 PM

the fan motor stops or the temperature of the air coming out changes?

Silence86 · 11-01-2009, 10:15 PM

the fan motor doesnt completely stop just slows down alot

**old Rusty C10** · 11-01-2009, 11:00 PM

sounds like either there is a wiring issue or there is an issue with a connection id start there and work my way back to a blower fan relay, as long as the alternator is good and there is no charging issue where the voltage drops at idle so that it doesnt get enough juice to spin the blower motor

Silence86 · 11-01-2009, 11:01 PM

ill check first thing tomorro morning thanks

TravisMartin · 11-02-2009, 03:02 AM

Sounds to me like the fan isn't running at all, or maybe just on low...you're getting some air when driving from the wind pushing it in.

I'm assuming you've already checked the fuse?

Check the blower resistor and its plug; they're bad about rusting and overheating and making poor connection. It'll be about a five wire plug onto a diamond shaped gizmo (the blower resistor) mounted to the a/c suitcase over by the right hood hinge. The resistor is held into the suitcase with two hex head self tapping screws. Take it out of the suitcase and inspect it...there are three resistors on the part if I recall. If any of them is broken or if any of them has broken loose from its terminal, you need to replace the assembly; they're made of nichrome wire and you can't solder them. Make sure the terminals are clean and making good contact with the connector.

If you still have problems, it's probably the dash switch. Post your progress and we'll help.

Travis

10-30-2009, 09:26 AM	#1
Silence86 Registered User Join Date: Feb 2009 Location: N. Richland Hills Tx Posts: 229	heater problems..help ok so on my 86, the heater only really works when im driving...when i come to a light, kinda stops. this really sucks cause this morning i needed to use my defrost and had to roll with the window down freezing my a off...help please

10-30-2009, 07:17 PM	#2
old Rusty C10 Robert Olson Transport Join Date: Oct 2002 Location: recent transplant to NC USA Posts: 20,277	Re: heater problems..help the fan motor stops or the temperature of the air coming out changes? __________________ Bob 1951 International running on a squarebody chassis "If a man's worth is judged by the people he associates himself with, then i am the richest man in the world knowing some of the fine people of this board" http://67-72chevytrucks.com/vboard/a...t.php?f=25&a=9 (you can review the site rules here!) PM Me for your vehicle/parts hauling needs in the North East US or see my Facebook page Robert Olson Transport Live each day to the fullest.. you never know when fate is going to pull the rug out from under you... I hate cancer!!

11-01-2009, 10:15 PM	#3
Silence86 Registered User Join Date: Feb 2009 Location: N. Richland Hills Tx Posts: 229	Re: heater problems..help the fan motor doesnt completely stop just slows down alot

11-01-2009, 11:00 PM	#4
old Rusty C10 Robert Olson Transport Join Date: Oct 2002 Location: recent transplant to NC USA Posts: 20,277	Re: heater problems..help sounds like either there is a wiring issue or there is an issue with a connection id start there and work my way back to a blower fan relay, as long as the alternator is good and there is no charging issue where the voltage drops at idle so that it doesnt get enough juice to spin the blower motor __________________ Bob 1951 International running on a squarebody chassis "If a man's worth is judged by the people he associates himself with, then i am the richest man in the world knowing some of the fine people of this board" http://67-72chevytrucks.com/vboard/a...t.php?f=25&a=9 (you can review the site rules here!) PM Me for your vehicle/parts hauling needs in the North East US or see my Facebook page Robert Olson Transport Live each day to the fullest.. you never know when fate is going to pull the rug out from under you... I hate cancer!! Last edited by old Rusty C10; 11-01-2009 at 11:01 PM.

11-01-2009, 11:01 PM	#5
Silence86 Registered User Join Date: Feb 2009 Location: N. Richland Hills Tx Posts: 229	Re: heater problems..help ill check first thing tomorro morning thanks

11-02-2009, 03:02 AM	#6
TravisMartin Curmudgeon of Poor Means Join Date: Jan 2009 Location: Lubbock, Texas Posts: 113	Re: heater problems..help Sounds to me like the fan isn't running at all, or maybe just on low...you're getting some air when driving from the wind pushing it in. I'm assuming you've already checked the fuse? Check the blower resistor and its plug; they're bad about rusting and overheating and making poor connection. It'll be about a five wire plug onto a diamond shaped gizmo (the blower resistor) mounted to the a/c suitcase over by the right hood hinge. The resistor is held into the suitcase with two hex head self tapping screws. Take it out of the suitcase and inspect it...there are three resistors on the part if I recall. If any of them is broken or if any of them has broken loose from its terminal, you need to replace the assembly; they're made of nichrome wire and you can't solder them. Make sure the terminals are clean and making good contact with the connector. If you still have problems, it's probably the dash switch. Post your progress and we'll help. Travis



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