Quote:
Originally Posted by Jim's rare 80
The ground at the heater core could be your problem for hi speed. Always repair any ground problem you may find. Sooo important.  Also, check for a wire that runs from the relay to the drivers side firewall. There is a seperate wire from in the dash, to the blower relay for high speed. Usually red, or pink. Mine burnt in the dash, took forever to trace it. Check it out, and let us know.  |
I had the same problem in my 79 Holiday 88. I replaced all the connections on that line. Blower motor and heater work great now!