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No heat

Tiny
FORENSICS
  • MEMBER
  • 1989 GMC TRUCK
  • V8
  • 4WD
  • AUTOMATIC
  • 190,000 MILES
Hi I have the truck listed above V3500 with no heat. The heater core hasn't been bypassed and I don't smell any syrup in the cab. I also don't slowly lose any coolant. The blower motor works and the switches for the air all work. So I have no clue as to what it could be. Also it has the 454 and it's a dually.
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Saturday, April 27th, 2019 AT 10:37 PM

1 Reply

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Good morning,

I would start by making sure the thermostat is working and the coolant is getting hot enough.

https://www.2carpros.com/articles/car-heater-not-working

https://www.2carpros.com/articles/replace-thermostat

I would also remove the heater hoses from the firewall and flush out the heater core with a garden hose until you get equal flow to both sides.

Make sure the blend door is responding correctly with commanding heat.

Roy
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Sunday, April 28th, 2019 AT 4:43 AM

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