Question about 1984 Chevrolet S-10

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Heater when I turn my heat on no matter what setting it is on it only comes out of the defrosters and the floor what could this bee?

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U need to check the vacuum to the mode control switch at the back of the AC/heater control, if there is vacuum replace the vacuum switch, if no vacuum check for broken small vacuum line at the engine.

Posted on Feb 12, 2009

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Had no heat at all in my 06 equinox tried everything to fix and no luck. Until I noticed AC pump was turning on and off unplugged it and now have heat. What would cause AC to do that?


The A/C compressor will cycle if the climate controls are set to send air to the defroster vents, or if the controls are set to an A/C position. Running when on defrost prevents fogging. What is most likely your issue is that the blend door in the heater box is not shifting over completely to the heater core, thus you are getting the colder A/C air rather than the heated air. You could also have a kinked heater hose or partially clogged heater core.

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I assume your heater setting is electric control, if so either your defrost and floor heat switch failed or wire problem. For the air not hot, check the heat control valve on the top of the hose it should be in front of the firewall. I don't know your car is using mechanic valve or electric control valve. Anyway check there first. Good luck.

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its called the blend door actuator
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i had a simmiler problem on my 95 chevy pick up. on mine it would not chg. from floor to defrost, no matter where i put the selector. with mine it was the controls. if you go under solutions for k1500chevy gmc trucks it should tell you what your problem is, or give you an idea whats going on with yours.

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