Intermittent heat

125,000 MILES • 6 CYL
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CHAPO5959
  • MEMBER
  • 1 POST
Heat works fine most of the time but will suddenly start blowing cold air. This may last anywhere from two to fifteen minutes. It will shut it down and have to check it every minute or so. Had a mechanic check out thermostat, radiator, heater core, says all checks out. Friend said he had similar problem with a car and it ended up being an A/C switch, or something to that effect. Has the older slide style settings. Thanks for any assistance.
Feb 6, 2017 at 9:31 PM
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HMAC300
  • ✓Experienced Mechanic
  • 48,601 POSTS
this has a vacuum setup and it may be leaking vacuum at the motor or control or hose. check for a vacuum leak or poor supply. the motor may be leaking and closing door for heat. See picture.
Feb 6, 2017 at 10:07 PM
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