1980 VW Caddy (non a/c) - Heater motor was working fine until it randomly cut out today. Heater core was swapped last week... Car was driven a few hundred miles with the heater on at times since swap.
What should I check for? I already checked fuses. Its dark out so I didn't really get to look at it all too much. What typically goes wrong with mk1 heater systems? The blower motor still spins freely... Do the resistors go bad on them?
I found a black/red wire that I thought was it. It was butt connected and a mess, so I removed the mess and hooked it back to where it was on the fuse box. Still nothing. How often do the resistors go bad? If I touch a wire off the battery to each wire off the resistor it will power up the blower motor in different speeds.
Need to get a test light and or volt meter before I go any further.
Last edited by trip permit; 2012.02.12 at 15:32 PM.
If it still does that then the motor and resistor are fine.
The black/red wire should go to your fan switch.
From the switch there should be a white wire going to the blower resistor = speed 1
Then yellow/black = speed 2
And Yellow is speed 3
Try putting power to each wire going to the blower motor resistor and see if you have all speeds.
You must also have a good ground (brown) but I suspect that's in order as you said the motor still works.
Update/Fixed: Black/red wire was cut from the blue plug in the fuse box and ran who knows where. I connected it back up to the fuse box and all is good again.
Funny story about on the way to fix the truck (Copied from my FB)..
cop: "Do you know fast you were going sir?"
me: "No sir actually I don't" As I look at the cluster sitting on the passenger seat.
cop: "haha, get that fixed and go with the flow of traffic."
me: "will do, have a good day sir"
Well that was nice to get a friendly cop for a change. Good times in the caddy continue...
Haha that happened to me about 20 years ago when I was testing the engine in my old El Camino. I was driving around Redmond with no dash, no cluster, no seats or interior! I was sitting on an ammo can on its side. . . . Hehe
The Officer told me to be safe and get it home to get it fixed. He also laughed and said. . . ."at least you're wearing your seat belt!" Haha