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My heaT in 1988 chevy 1500 is not switching from outside ...

Sent to Car Experts January 11 12:08 PM

My heaT in 1988 chevy 1500 is not switching from outside air to heat what or where is the problem

Optional Information:
1988 Chevrolet 1500 305

Already Tried:
heater core and thermostat

Customer (name blocked for privacy)
Status:  Closed   Value: $8
Answer
January 11 12:21 PM (13 minutes and 37 seconds later)
         
ACCEPTEDCheck Mark

The problem is in the air diverter doors under the dash. They are not changing position. This could be a bad vacuum motor, control switch, vacuum hose leak, or door stuck.

Hope this helped, if so please accept.



If more information is needed, please ask me.

Hope this helps, an accept would be appreciated.
Firsthogman
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Firsthogman -- Auto Service Technician -- 96% Positive Feedback on 300 Car Accepts
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Reply
January 11 12:24 PM (2 minutes and 27 seconds later)
         
how easy to get to after i remove glove box and is it possilble to move door by hand
Customer (name blocked for privacy)
Answer
January 11 3:10 PM (2 hours and 45 minutes and 57 seconds later)
         
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40 years as a mechanic on all type equipment.
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