Question about 1997 Ford Ranger SuperCab

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Heater blows hot all of the time.

My heater blows hot at all times even when you switch it to A/C... replaced the switch, and still has the problem. all of the other functions work correctly except that it always blows hot. Now granted the blower speed switch does work correctly so I can turn it off, but I would like to find a solution to this problem before summer.

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  • Ryan O'Rand Jan 01, 2009

    Im wondering if the Blend door inside the dash is not functioning properly... I hate to pull the entire dash apart just to find out that that doesnt fix it.

  • Ryan O'Rand Jan 01, 2009

    I pulled the small hose off of the valve and vacuum tested it. It does not seem to be getting any vacuum to it.

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The vacuum operated valve in the engine bay is stuck in the open position.
You should be able to find it on the firewall with the heater hoses from the engine connected to it.

Posted on Jan 01, 2009

  • J F Jan 02, 2009

    If there is no vacuum at the valve there may be a hole in the hose or possibly no vacuum getting to the switch on the dash.

    Not an easy one to diagnose.... You'll have to search it out step by step.

    you know there is no vacuum at the valve so check for vacuum at the switch. If it is there then the switch is faulty. If no vacuum at switch check the main vac hose from the inlet manifold.

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