Heater core replacement

Tiny
SWILLIAMS
  • MECHANIC
  • 597 POSTS
The ENTIRE dash comes out. There are screws behind the speakers on each side and behind the defroster vent. Pls some on each end underneath and at the center where the console is.
You also need to drop the steering column.

Get a new core. They are not usually worth repairing.
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Sunday, October 25th, 2020 AT 12:19 PM (Merged)
Tiny
SERPENTRACER
  • MEMBER
  • 34 POSTS
Does the hoses of the heater core get hot?
If they don't you need to flush it out or bleed the system better/more.

If they do then you can start looking into the controls.
Vacuum operates all the doors of these trucks.

A common problem with these trucks is a bad vacuum line. They go into the cab near the brake booster.
Rubber vacuum lines on these trucks seem to last about 4 years.
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Sunday, October 25th, 2020 AT 12:19 PM (Merged)
Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
Here is a flow chart for troubleshooting. See if you can come up with any information that might help us get to the bottom of this.


https://www.2carpros.com/forum/automotive_pictures/192750_HeaterDiagnosis98SonomaFig01a_1.jpg



https://www.2carpros.com/forum/automotive_pictures/192750_HeaterDiagnosis98SonomaFig01b_1.jpg



https://www.2carpros.com/forum/automotive_pictures/192750_HeaterDiagnosis98SonomaFig02a_1.jpg



https://www.2carpros.com/forum/automotive_pictures/192750_HeaterDiagnosis98SonomaFig02b_1.jpg

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Sunday, October 25th, 2020 AT 12:20 PM (Merged)
Tiny
TARCHER
  • MEMBER
  • 1 POST
  • 1991 GMC SONOMA
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 45,000 MILES
Heater core removal from inside cockpit or through fender well?
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Sunday, October 25th, 2020 AT 12:20 PM (Merged)
Tiny
MASTERTECHTIM
  • MECHANIC
  • 4,750 POSTS
From inside the cock pit. Remove passenger side lower hush panel and glove box. Remove cover to access heater core. **Fairly easy job for the do it yourself mechanic.
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Sunday, October 25th, 2020 AT 12:20 PM (Merged)

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A heater core is po­si­tioned in­side the car and is part of the HVAC sys­tem. Hot en­gine coolant is run through the core which air is blown through via the blower mo­tor which ...
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