Heater

Tiny
SEAWOLF
  • MEMBER
  • 1986 GMC JIMMY
  • 4WD
  • AUTOMATIC
  • 150,000 MILES
I have a 1986 k5 blazer 305, recently I installed a 350 out of a 78 gmc pickup, since then the heater will not switch to defrost or vent, have lots of heat and fan works fine Did I miss a vacum hose.I see a 1/2 inch one near the firewall, seems to enter the cab below the fuse box, its not connected to any thing?
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Tuesday, January 4th, 2011 AT 4:56 PM

2 Replies

Tiny
DOCFIXIT
  • EXPERT
Yes vacuum is problem without heater controls go to default. That hose off could be the one but see diagram hose will come from vaccum tank and should have a check valve. Maybe still on old engine
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Tuesday, January 4th, 2011 AT 6:04 PM
Tiny
SEAWOLF
  • MEMBER
Found hose(more like a small tube)hooked it up works fine thanks.I skipped by it several times, thought it was an electrical(push on)connection, Thanks foe you're help
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Thursday, January 6th, 2011 AT 8:39 PM

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