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Heater blowing fuse

Tiny
JOE BRUNETTE SR.
  • MEMBER
  • 2003 BUICK RENDEZVOUS
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 150,000 MILES
Heat issue, blowing fuses.
Tuesday, December 12th, 2017 AT 1:10 AM

3 Replies

Tiny
PATENTED_REPAIR_PRO
  • MECHANIC
  • 1,853 POSTS
Which fuse or fuses is it blowing and when? As soon as you turn the ignition key on or when you turn the heat or blower fan on?
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Tuesday, December 12th, 2017 AT 6:15 AM
Tiny
JOE BRUNETTE SR.
  • MEMBER
  • 2 POSTS
Ok. It was blowing the heater fuse when the switch was turned on. So I found the resistor and plug were burned out. After replacing those two items and the blower motor itself, I am now not getting any power to them or the fuse block for that matter
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Wednesday, December 13th, 2017 AT 2:06 AM
Tiny
PATENTED_REPAIR_PRO
  • MECHANIC
  • 1,853 POSTS
I assume this is the "FRT BLWR" fuse in the center console fuse block. If so, it is fed from the IGN 3 relay (same fuse block) and that relay is fed from the ignition switch when the key is on run, the ignition switch is fed from "INKEY" fuse #42 in the same fuse block, then before that the "BATT" fuse #1 in the underhood fuse block. The other half of that IGN 3 relay is fed from the "IGN 3" fuse #47 in the underhood fuse block.
So, check all of those fuses and if there are all ok, try a new IGN 3 relay.
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Wednesday, December 13th, 2017 AT 6:22 AM

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