87 corvette A/C Fuse
Thread Starter
Cruising
Joined: Mar 2014
Posts: 12
Likes: 0
87 corvette A/C Fuse
I have a 87 corvette with manual weather controls. When I put fan speed on high the AC fuse blows. I replaced the relay and the resistor but it still does it. I've read a lot of other forums and they say to check the inline fuse but I cannot find it. I don't know if this matters or not but when the car is off I still have power at the red wire going into the relay. That's all the info I have. So why do I keep blowing fuses and how do I fix it. Thank you
Team Owner
Joined: Sep 2003
Posts: 25,389
Likes: 2,741
I have a 87 corvette with manual weather controls. When I put fan speed on high the AC fuse blows. I replaced the relay and the resistor but it still does it. I've read a lot of other forums and they say to check the inline fuse but I cannot find it. I don't know if this matters or not but when the car is off I still have power at the red wire going into the relay. That's all the info I have. So why do I keep blowing fuses and how do I fix it. Thank you
Put 12V to motor from battery to check with a maybe 3AMP or 5AMP fuse. Will it run? Does it get hot? You haven't replaced the switch? Actually an '87 with manual AC the relay is powered with a "fusible link" rather than an inline fuse, like Cliff mentioned. Do you have an FSM? Should be simple enough to check the "red" wire at the relay with a test light. Is it powered? If yes it's NOT a fuse or the "fusible link. You have the lower speeds with out problems? You mention you've checked and have power to the relay at all times so you've eliminated that aspect of the problem.
Last edited by WVZR-1; Mar 2, 2014 at 06:01 AM.
Race Director
Joined: Sep 2003
Posts: 16,837
Likes: 338
From: Database Error Indiana
In the last 15 years my fan went bad 2 times. First time it just quit. Nothing looked wrong. Second time, the fusible link went up in smoke. The car does have 168000 miles on it so Im not complaining.
Thread Starter
Cruising
Joined: Mar 2014
Posts: 12
Likes: 0
Thank you everyone for the replies. But I don't think the motor is bad because i am fine on the 3 lower speeds. And I ran power directly to the motor from another battery and it will run just fine. It's just when I'm inside the car and I go to turn it in high it instantly blows the fuse.
Melting Slicks
Joined: Jun 2013
Posts: 3,065
Likes: 39
Thank you everyone for the replies. But I don't think the motor is bad because i am fine on the 3 lower speeds. And I ran power directly to the motor from another battery and it will run just fine. It's just when I'm inside the car and I go to turn it in high it instantly blows the fuse.
Team Owner
Joined: Sep 2003
Posts: 25,389
Likes: 2,741
Thank you everyone for the replies. But I don't think the motor is bad because i am fine on the 3 lower speeds. And I ran power directly to the motor from another battery and it will run just fine. It's just when I'm inside the car and I go to turn it in high it instantly blows the fuse.
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Melting Slicks
Joined: Jun 2013
Posts: 3,065
Likes: 39
Get yourself a multimeter, set it to ohms, measure the resistance of the high fan speed circuit. Through the wires and switch, you should see no more than 0.2 ohms. If you see more than that, trace it down by measuring resistance of the circuit in segments and replace/repair that item.
Edit: Or, trace down the whole circuit and see if you find an area where the wire or switch shorts to something else.