I have a 1996 GMC Jimmy ~129,000 miles 4 door 4 wheel drive 4.3 liter engine? My heater blower motor comes on intermittently as seems to really load the new alternator, engine RPM jump up. I have checked the fuse, it is ok. I noticed there are 3 Bosch blower motor relays on the passenger side firewall. I replaced 1 of them, (the one on the right side if you are sitting in the seat) did not work. Any ideas? Do I need to change all 3?
Thursday, November 15th, 2007 AT 3:05 PM