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Luke warm air

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Old 11-04-2011, 12:08 PM   #1
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Default Luke warm air

My heat comes out Luke warm and never gets hot. Could this be my thermostat? What else can I look for? I read in a repair manual it could be some electronics not working?

I have a 97 Ext cab 4.6 F150

Thanks in advance
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Old 11-04-2011, 12:47 PM   #2
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blendoor motor actuator, easiest way to tell is to first turn it to heat and let it sit for several minutes then switch it to a.c, if no change then its the actuator, if there is a change check the heater core
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Old 11-04-2011, 02:41 PM   #3
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When I turn it to ac do I leave the dial on my dash on warm?
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Old 11-04-2011, 04:56 PM   #4
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Quote:
Originally Posted by larbec
When I turn it to ac do I leave the dial on my dash on warm?
Lol
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Old 11-04-2011, 06:09 PM   #5
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Quote:
Originally Posted by larbec View Post
When I turn it to ac do I leave the dial on my dash on warm?
i think what he's saying is to see if there is a difference between all the way cold (blue) and all the way hot (red) - if there is then you know that the blend doors are working and you most likely need a new heater core.
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Old 11-07-2011, 08:32 AM   #6
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There is no difference. I turn on AC and put it to hot and it's Luke warm. I felt the top and bottom hoses on radiator and they were warm NOT hot after 10 minutes if run time.

Thermostat?
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Old 11-09-2011, 12:26 AM   #7
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thermostat does nothing for the ac/heating system, im willing to bet its the actuaor for the blendoor, another way to tell is have the speed **** on low and the car on the acc position not on, and switch it from max cool to to max heat, you should hear a slight wine from the actuator
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Old 11-09-2011, 02:38 AM   #8
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Quote:
Originally Posted by devenfx4
thermostat does nothing for the ac/heating system, im willing to bet its the actuaor for the blendoor, another way to tell is have the speed **** on low and the car on the acc position not on, and switch it from max cool to to max heat, you should hear a slight wine from the actuator
That statement is wrong if your thermostat is stuck open the truck will never see operating temps
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Old 11-09-2011, 02:29 PM   #9
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That statement is wrong if your thermostat is stuck open the truck will never see operating temps
x2
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Old 11-10-2011, 12:31 PM   #10
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If the Tstat is stuck open would my hoses be hot?
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