Jump to content

14th Annual SoCal Vintage BMW Meet 2021! “All couped up”

Registration is still open. Rally from NorCal is scheduled for Friday. Post your event photos.

SoCal Vintage is Here! 

Post your photos!

heater box problems


Recommended Posts

I refurbished my heater box and bench tested the fan. everything checked out. so I bolted it back in the car and hooked up the electrical, and it all worked great. I thought to myself "wow it actually worked with no problems" too bad I didn't knock on wood because once I put the selector levers back on the dash and then tried it again it just blew the 16 amp fuse. so i made sure all loose wires were taped up and were secure. but the problem persists. any ideas why it would just start blowing fuses out of nowhere?

Link to comment
Share on other sites

Time to go to work. Pull the fuse (it is blown as reported so it really isn't needed). Turn the switch on and use a continuity tester check to ground on the fan side of the fuse (not the bus side, not side). If it shows a completed circuit, you have a short to ground.

Chase the wire to the switch and check on the wire to the fan motor with the wire to the fan motor off the switch. Continue on until the circuit shows open. Between there and the privious point is the grounded spot.

Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.

Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.


  • Create New...