Question about 1991 Ford Ranger Supercab

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Heater in truck blows either cold air or no air.

When I turn on my heater in my truck, it only blows out cold air. Sometimes, no air at all comes out. I drive a 1991 ford ranger. What could be causing this?

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  • kayla bryson
    kayla bryson Oct 02, 2009

    Thank you! I hope that works.

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  • Ford Master
  • 4,369 Answers

It sounds like you have air trapped in the cooling system. Try filling the radiator and coolant reservoir cold. Then leave the radiator cap loose and run engine at 1500 rpm until it warms up and the thermostat opens. Make sure heater is on full warm setting.

Posted on Oct 02, 2009

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Blows cold air turn heat on


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1 Answer

My yruck only blows cold air wont blow warm


Could be the air flaps of the heater unit are set incorrectly or not working at all or possibly the heater radiator is blocked or semi-blocked or perhaps there is something wrong with the heater hoses or the heater water valve if one is fitted.

These things need checking before a cause can be established.

I am sometimes called upon to flush out a heater radiator. Sometimes it works and sometimes it doesn't and sometimes it causes a leak and the heater radiator must be replaced. Not an easy job on many vehicles made in the last couple of decades..

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My heater blows cold air 85% of time


You got a bad heater door module most likely or the door itself may have issue.

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My air condition only blows out cold air not hot


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I have a 95 honda accord and it only blows cold air,the tempature gets to where it should be but it is still only blowing cold air.Help


if the car has been drained recently you might need to bleed your small rad in heater you call it your heater core sometimes get air locked or possibly your heater valve not turning on when you put on heat

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Heater blows cold air but sometimes will blow


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it sounds like a bad blend door motor.these are controlled electrically and not with a cable like older vehicles did.

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Heater blows cold air


With the car warmed up,feel the heater hoses,are they both warm/hot near the firewall in the engine compartment?If they are both warm/hot,then the heater core should have circulation through it and it may be a "blend door" issue in the heater a/c assembly.If they are not warm/hot then the heater core could be dirty and plugged up and needs to be flushed.
If the above does not help,a drain and vacuum of the cooling system and vacuum refill will remove any trapped air.
Sometimes,clamping off the top rad hose and holding the engine rpm at 2000 rpm will force trapped air out of the heater core.(Watch temp gauge when trying this)
Lastly,a NEW thermostat doesn't mean its working correctly.

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