Before I post, I want to let everyone know that I searched other posts for this problem to no avail.

With that said, I have an 80 rx. The problem I am having is that whenever I have my radio on, when I turn on my heater or ac, the fuse for the radio blows. Anyone have any ideas why it's doing this, and how to fix it?

Oh and happy thanksgiving to everyone from Misawa Air Base, Japan!!!

 

Welcome to the forum and the Darkside. Two possibile causes come to mind offhand. 1. There is a bare wire that's shorting to ground, 2. The fuse is under rated. In my sig line is a link to the online FSM, carb manual, etc.. While the earlier wiring diagrams are nearly worthless, you might look through the 85 one and check it out. Do you have the cover panel for your fuse block and are the fuses the correct size? If they are are, you may need to start chaseing wires.

If your radio is non-oem, that's where I'd start.
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+1.
Trust me, before delving deep into the car, usually the most simplest explanation is the answer. And, for something like a fuse, I'm guessing probably a low rated fuse. Seeing as how the heater/AC requires a bit more extra amperage, that's probably the reason why: a low rated fuse.

Check that first.

 

Man this forum is awsome. Thanks for the help guys. My car is actually with my father back in CA, so I'll tell him to check the fuse and see if it's rated properly.

 

Also if you have an aftermarket radio set-up make sure you calculate the proper fuse to put in. I haven't personally run into this problem since my Pioneer has a back-up mini 10A fuse in the back of the unit. But I have had a friend who kept blowing his fuse because his radio was drawing way more amperage from the circuit he had used...

 

An aftermarket radio shouldn't pull more amps than the stock system. I've replaced many stereo units and never once had to replace the fuse in the fuse panel with a larger amp rating.

 

air force and rx7s......you make good choices