HEATER CONTROLS NOT WORKING PROPERLY - Ranger-Forums - The Ultimate Ford Ranger Resource


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Old 01-09-2016
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HEATER CONTROLS NOT WORKING PROPERLY

MY SELECTOR SWITCH NOT WORKING
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Old 01-09-2016
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Check fuse #18(15amp) and fuse #10(7.5amp) in cab fuse box
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Old 01-09-2016
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I'll give it a try ,thanks for the help
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Old 01-10-2016
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If you mean the air doesn't go where it should or the air flow is low and you still hear the fan then a common issue is the Blend Door.

Google: ford ranger blend door

Explorer, Ranger, and most ford trucks used the same setup
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Old 01-11-2016
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I'll check out the blend door the fuses are good I'll keep going to find the fix, thanks
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Old 01-13-2016
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The blend door is moving from hot to cold, but I can't get the unit go from defrost to vent or floor, how can you check the selector, the vacuum side. I think it's time to check all vacuum line & tank for this side
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Old 01-13-2016
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First look in the engine bay for a Black Plastic Sphere, that is the vacuum storage tank.

Should have two hard plastic vacuum hoses attached, some just have one line and a Check valve, you will see it if you follow the one line.
From storage tank or check valve will be a line to the intake manifold, that's the vacuum source.
The "other line" will go to the firewall and into the cab, this is the vacuum line that makes the air direction doors work.

First check if the storage tank can hold a vacuum, put a hose on it and suck on the end of the hose.
Follow the Vacuum Source line to intake manifold and make sure it is hooked up.

Put cab selector to OFF, then suck on the line going thru firewall it should hold a vacuum.

Last edited by RonD; 01-13-2016 at 09:16 PM.
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Old 01-14-2016
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looked in the engine bay and found the lines 2 lines from the firewall, 1 white line didn't go anywhere, 1 black line goes to vacuum tank, second line from the tank broken , but found connection for it & fixed it, most of the system works now, got to find where the white line goes. I thank you for all of your help with this problem... I will find where this line belongs & fix it
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Old 01-14-2016
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Good work.

Thanks for posting the fix, should help others in the future.

White line often goes to a vacuum actuator on/near blower housing, I think it is for A/C, but not sure.
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Old 01-14-2016
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by everything I can find out it is for fresh air or recycle air in the a/c circuit, but I haven't found where it goes outside cab as of yet,but I will... If I do I 'll place it here

thank you again
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