"HEAT" fuse - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Hair · 06-13-2008, 03:30 PM

What is the fuse for that says "HEAT" beside it. As you can see, mine is missing. My heater works fine. My blower works and there's nothing else electrical about the heater...that I know of anyway... so what does this "HEAT" fuse do anyway?

Longhorn Man · 06-13-2008, 06:27 PM

I wonder if this diagram we've been useing for so long might be off a little.
Do your turn signals work?

**oldgold70c10** · 06-13-2008, 06:32 PM

The fuse labeled Air Cond should really be Air Cond or Heat, depending on what you have. Use a 10 amp fuse for heat only trucks, and a 25 amp fuse if you have factory AC. The fuse labeled heat is for the radio, but with the right size fuse, could be used for any load that you want on in run or acc. In the first photo, he is pointing at the horn relay.

muddyblazer02 · 06-13-2008, 09:07 PM

Quote:

Originally Posted by oldgold70c10

The fuse labeled Air Cond should really be Air Cond or Heat, depending on what you have. Use a 10 amp fuse for heat only trucks, and a 25 amp fuse if you have factory AC. The fuse labeled heat is for the radio, but with the right size fuse, could be used for any load that you want on in run or acc. In the first photo, he is pointing at the horn relay.

The size of wire behind the fuse socket will determine the load capacity of the circuit, and thus will determine what size fuse you could and should use. If you put a fuse in there that is too much for the circuit, you will over load it and potentally start a fire.

**oldgold70c10** · 06-14-2008, 02:55 PM

You can use any size wire up to a 12 guage, and the corisponding fuse size, since the radio fuse powers the plug terminal above it. The heat/AC fuse size is based on the factory markings on the fuse panel.

Hair · 06-16-2008, 07:23 AM

Everything on my truck works just fine except for the radio, it is dead. I bet that's why. I'm going to stick a fuse in there and see if it comes on. If it works, then I bet I'll see out why they took the fuse out :-) It has the original eight track in it, I hope it works, that will be cool!

**oldgold70c10** · 06-16-2008, 06:51 PM

That would be cool if it did work. Chances are though, if it still has the original speaker that the voice coil on the speaker is open and the set won't play. The original speaker was 10 ohms impedence, but modern 8 ohm units work just fine in their place.

06-13-2008, 03:30 PM	#1
Hair Registered User Join Date: Mar 2008 Location: Tullahoma, TN Posts: 406	"HEAT" fuse What is the fuse for that says "HEAT" beside it. As you can see, mine is missing. My heater works fine. My blower works and there's nothing else electrical about the heater...that I know of anyway... so what does this "HEAT" fuse do anyway? Attached Images

06-13-2008, 06:27 PM	#2
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	Re: "HEAT" fuse I wonder if this diagram we've been useing for so long might be off a little. Do your turn signals work?

06-13-2008, 06:32 PM	#3
oldgold70c10 Who's got steelies? Join Date: Feb 2006 Location: Morrison, Oklahoma Posts: 1,023	Re: "HEAT" fuse The fuse labeled Air Cond should really be Air Cond or Heat, depending on what you have. Use a 10 amp fuse for heat only trucks, and a 25 amp fuse if you have factory AC. The fuse labeled heat is for the radio, but with the right size fuse, could be used for any load that you want on in run or acc. In the first photo, he is pointing at the horn relay. __________________ 1969 C10 LWB W/ 250 I6 & 3spd 1970 C10 with '67 small window cab, 68 front end, blue; 305/TH350, 3.08 limited slip rear end, manual brakes, power steering; & 4-wheel drums-My daily driver. 1975 Chevelle Malibu Classic Coupe 350/th350 mint green 1970 C20 Suburban 350/700R4 4.10 gearing green & white 1978 Big 10 Silverado 350/th350, working ac, 2 tone blue-My summer daily driver 1983 GMC 1500 Sierra 305/SM465 2.73 rear end How to add a trip odometer to your 67-72 stock speedometer How to rebuild your Q-Jet My Truck Page My Youtube Channel

06-14-2008, 02:55 PM	#5
oldgold70c10 Who's got steelies? Join Date: Feb 2006 Location: Morrison, Oklahoma Posts: 1,023	Re: "HEAT" fuse You can use any size wire up to a 12 guage, and the corisponding fuse size, since the radio fuse powers the plug terminal above it. The heat/AC fuse size is based on the factory markings on the fuse panel. __________________ 1969 C10 LWB W/ 250 I6 & 3spd 1970 C10 with '67 small window cab, 68 front end, blue; 305/TH350, 3.08 limited slip rear end, manual brakes, power steering; & 4-wheel drums-My daily driver. 1975 Chevelle Malibu Classic Coupe 350/th350 mint green 1970 C20 Suburban 350/700R4 4.10 gearing green & white 1978 Big 10 Silverado 350/th350, working ac, 2 tone blue-My summer daily driver 1983 GMC 1500 Sierra 305/SM465 2.73 rear end How to add a trip odometer to your 67-72 stock speedometer How to rebuild your Q-Jet My Truck Page My Youtube Channel

06-16-2008, 07:23 AM	#6
Hair Registered User Join Date: Mar 2008 Location: Tullahoma, TN Posts: 406	Re: "HEAT" fuse Everything on my truck works just fine except for the radio, it is dead. I bet that's why. I'm going to stick a fuse in there and see if it comes on. If it works, then I bet I'll see out why they took the fuse out :-) It has the original eight track in it, I hope it works, that will be cool!

06-16-2008, 06:51 PM	#7
oldgold70c10 Who's got steelies? Join Date: Feb 2006 Location: Morrison, Oklahoma Posts: 1,023	Re: "HEAT" fuse That would be cool if it did work. Chances are though, if it still has the original speaker that the voice coil on the speaker is open and the set won't play. The original speaker was 10 ohms impedence, but modern 8 ohm units work just fine in their place. __________________ 1969 C10 LWB W/ 250 I6 & 3spd 1970 C10 with '67 small window cab, 68 front end, blue; 305/TH350, 3.08 limited slip rear end, manual brakes, power steering; & 4-wheel drums-My daily driver. 1975 Chevelle Malibu Classic Coupe 350/th350 mint green 1970 C20 Suburban 350/700R4 4.10 gearing green & white 1978 Big 10 Silverado 350/th350, working ac, 2 tone blue-My summer daily driver 1983 GMC 1500 Sierra 305/SM465 2.73 rear end How to add a trip odometer to your 67-72 stock speedometer How to rebuild your Q-Jet My Truck Page My Youtube Channel



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