Climate control issue

Tiny
WESTY1620
  • MEMBER
  • 1988 CHEVROLET VAN
  • 5.7L
  • V8
  • 2WD
  • AUTOMATIC
  • 295,000 MILES
My van blows air but no heat. The controls are sticky going from cold to hot and it will not change from defrost. But it gets even better. My heat gauge will not get higher the 110 to 120 degrees. I have flow through the heater core. When I bought the vehicle I was told it had a thermostat change. Any ideas I am lost?
Sunday, January 15th, 2017 AT 9:25 AM

1 Reply

Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Check to make sure both heater hoses are hot when engine warm. Check for a vacuum leak. If it has a water valve on heater hose or engine it must have vacuum to send hot water to heater. Also, must have for switching from defrost to floor. We do not have vacuum charts for that truck due to age. But start at engine and should go back to heater through firewall to control on dash then to vacuum motors on heater. Also, check for a broken heater cable if you have one I forget on that model.
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Sunday, January 15th, 2017 AT 11:10 AM

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