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Topic: Correct fuse amperage for Heater / AC blower, High Speed

in Forum: C3 Electrical

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Correct fuse amperage for Heater / AC blower, High Speed (1/8)
7/19/13 2:42pm

Orange-L82
Former Member
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Birmingham, AL - USA

Vette(s):
1975 L82 Coupe

Joined: 6/28/2013
Posts: 6

Does anyone know the correct fuse size, (amperage) that goes in the fuse link on the orange wire, that operates the high speed setting on the heater blower switch?

This is the orange wire with the fuse link that runs over to the passenger side to the high speed blower relay, (1975 Corvette).

My fan doesn't blow on high. I pulled the fuse and it's old, rusty and blown. However, I can't read the amperage on the old rusty fuse and I don't want to try replacng it unless i have the correct amperage, (don't want to melt any wires).

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Re: Correct fuse amperage for Heater / AC blower, High Speed (2/8)
7/19/13 6:21pm

Adams' Apple

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Duncanville, TX - USA

Vette(s):
#1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/ Am-Fm/map light National/Regional/Chapter NCRS "Top Flight" #2-1985 Bright Red/Carmine Cp.L-98/auto Member: NCRS, NCRS Texas, Corvette Legends of Texas

Joined: 11/8/2003
Posts: 20170

I think they are 30 amp, but I need to look in the manual to be sure.

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Re: Correct fuse amperage for Heater / AC blower, High Speed (3/8)
7/19/13 6:32pm

Orange-L82
Former Member
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Birmingham, AL - USA

Vette(s):
1975 L82 Coupe

Joined: 6/28/2013
Posts: 6

Adams' Apple said: I think they are 30 amp, but I need to look in the manual to be sure.

What manual are you referencing? I looked through the owners manual as well as my Haynes manual,..but I can't find the info anywhere.

I am always very scared about having a wiring melt down. To me, wiring can be the biggest headache,..not to mention fire concerns.

Please let me know if you can confirm.

Thanks!!!

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Re: Correct fuse amperage for Heater / AC blower, High Speed (4/8)
7/19/13 6:48pm

Adams' Apple

According to the Service Manual, and the wiring diagram, 25 amp fuse in the fuse box, and 30 amp in the in-line fuse holder. Thumbs Up

I use both the Factory Service Manual, and Mitchell Vintage to get a lot of this kind of info. The Haynes/Chilton type manuals don't always go into very much detail on accessories like the A/C system, nor does the Owner's Manual normally have fuse-link, or in-line fuse info.

btw..if the fuse holder is rusty/corroded, be sure to clean both ends of it really well, or replace it. Rust, or any kind of corrosion can create high heat with a lot of current flowing, which could melt the plastic holder, or keep the fan from blowing properly.

|UPDATED|7/19/2013 7:48:19 PM (AZT)|/UPDATED|

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Re: Correct fuse amperage for Heater / AC blower, High Speed (5/8)
7/19/13 6:56pm

Orange-L82
Former Member
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Birmingham, AL - USA

Vette(s):
1975 L82 Coupe

Joined: 6/28/2013
Posts: 6

Thanks for the info!!! I appreciate the help.

Yes,..the old fuse was actually rusted inside the holder. Both ends of the wiring tips were rusty too. (how did it rust inside the fuse holder)? I have cleaned both ends up with a steel wool pad. They look good now.

I will probabaly put a little dab of dialectrical grease on each end when I replace the fuse.

Thanks again!!

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Re: Correct fuse amperage for Heater / AC blower, High Speed (6/8)
7/20/13 11:00am

JohnRR
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Joined: 2/22/2011
Posts: 110

Rust, or any kind of corrosion can create high heat with a lot of current flowing, which could melt the plastic holder, or keep the fan from blowing properly. Or causing a fire that burns your car to the ground!

I suggest that you not use that crappy old fuse holder. On my '73 I soldered in a modern style fuse holder.

John

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1973 BB 4-Speed Coupe Project Car

2009 Z06 Mostly Stock

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Re: Correct fuse amperage for Heater / AC blower, High Speed (7/8)
10/25/17 4:06am

RedRick74
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Joined: 10/25/2017
Posts: 3

You might have a bad control fan switch .Located just above the a/c unit

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Re: Correct fuse amperage for Heater / AC blower, High Speed (8/8)
10/25/17 4:34am

RedRick74
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Joined: 10/25/2017
Posts: 3

The amp rating should be noted on the fuse box if it still can be read. I just had my c3 completedly rewired New fuse box and all new wires to all controls and lights. along with new A/C unit and wiring harness . This was due to a short in console which melted the wiring harness next to the tran neutral switch .Being 43 years old beware you could be next , so how old are your wires? The cost as of today over $4000,00. Which i was lucky the insurance payed cause i called it a fire. If it had been turned in as corrided wires they or anything due to age ,i checked my policy first before filing claim to Haggertys.This is very important to read and know your policy.I didnt have $4000.00 to pay for this, would you?

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