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1996 Ford Ranger 3.1 L Heater switch activates AC cmpressor blows cold air


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SamBo1
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Dec 7, 2009, 4:06 PM

Post #1 of 9 (3540 views)
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1996 Ford Ranger 3.1 L Heater switch activates AC cmpressor blows cold air Sign In

1996 Ford Ranger 3.1L When I turn my AC/Heat selector switch to Heater (any position) it activates the air compressor and blows cold air. I replaced switch. No change. Do I need to replace rotary temp control? Both heater hoses are hot. Blower and air distribution is ok.


fordtech
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Dec 9, 2009, 10:18 PM

Post #2 of 9 (3521 views)
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Re: 1996 Ford Ranger 3.1 L Heater switch activates AC cmpressor blows cold air [In reply to] Sign In

 3.1???? ford did not have a 3.1 in the rangers 2.3 3.0 or 4.0. A/C will be on if it is on defrost mode. the blend door is cable operated. need to check cable if it is switching the blend door.


Hammer Time
Ultimate Carjunky / Moderator


Dec 9, 2009, 10:29 PM

Post #3 of 9 (3518 views)
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Re: 1996 Ford Ranger 3.1 L Heater switch activates AC cmpressor blows cold air [In reply to] Sign In

The heat in that vehicle is controlled by a blend door that regulates heated air flow. it is operated by an electric motor/actuator. The problem can be that the actuator is stripped or inoperative or the door itself could be damaged. This is what needs to be determined by examining the actuator and see if it is responding to heat change commands or not.




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mik88
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Jul 5, 2010, 3:47 PM

Post #4 of 9 (3392 views)
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Re: 1996 Ford Ranger 3.1 L Heater switch activates AC cmpressor blows cold air [In reply to] Sign In

WOW! The guy asks why the AC compressor turns on when the selector is placed in other positions beside AC or MAX, and he gets comments about "Blend Doors"!

I have pretty much the same problem on my 2.3 four with AC. I understand perfectly well that the compressor comes on in AC or MAX position, and it does. The problem arises when you put the selector to other positions, where the compressor is NOT supposed to engage. On mine, the only position that will not engage the compressor is the "dash vent only" position, just to the left of "OFF". Any other position to the right side (HI/LO, FLOOR ONLY, FLOOR/DEFROST, or DEFROST ONLY) will engage the AC Compressor.

Does anyone know if this is the Function Selector Switch itself doing that, or is it possibly the Compressor Relay, WOT Relay, or what???

Any help in understanding which will be appreciated...I drive Ford trucks at work with the exact same Function Switch setup, so I do know it ain't a s'pose to work like it does on my Ranger...Thanks

p.s. The original poster said he changed his selector switch, so I wonder what this could be really...


(This post was edited by mik88 on Jul 5, 2010, 3:57 PM)


Hammer Time
Ultimate Carjunky / Moderator


Jul 5, 2010, 3:59 PM

Post #5 of 9 (3389 views)
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Re: 1996 Ford Ranger 3.1 L Heater switch activates AC cmpressor blows cold air [In reply to] Sign In

OK Mr WOW, If you had read the original question, you would have seen the complaint about requesting heat and getting cold air. The problem wasn't the compressor coming on, it was the temp of the air. The compressor is supposed to come on in all those modes.

Quote
When I turn my AC/Heat selector switch to Heater (any position) it activates the air compressor and blows cold air.


If you have a question about your own vehicle, then you need to start a new question for it.




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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



(This post was edited by Hammer Time on Jul 5, 2010, 3:59 PM)


mik88
New User

Jul 5, 2010, 4:24 PM

Post #6 of 9 (3384 views)
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Re: 1996 Ford Ranger 3.1 L Heater switch activates AC cmpressor blows cold air [In reply to] Sign In

Actually I did read it. As the topic title states, Heater switch activates the AC cmpressor blows cold air. Also, in the quote you provided you'll note the description states again that the "air compressor" comes on in any position. Your reply was helpful, but not in the way intended I'm sure. However, if you prefer this problem restated in a separate topic, I'll oblige...


Hammer Time
Ultimate Carjunky / Moderator


Jul 5, 2010, 4:30 PM

Post #7 of 9 (3380 views)
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Re: 1996 Ford Ranger 3.1 L Heater switch activates AC cmpressor blows cold air [In reply to] Sign In


Quote
Your reply was helpful, but not in the way intended I'm sure.


You really should do your homework before contradicting us. You might learn something.

A quote from the service manual for that vehicle

Quote
Air conditioning does two things to cope with the problems of high heat and humidity: (1) it cools the air to a comfortable level, and (2) it lowers the relative humidity to a comfortable percentage below the dew point.


Now if you have any idea how to read a wiring diagram, you will see in the following diagram for that vehicle that the clutch circuit is powered by the mode control switch in all modes but straight vent and straight floor. All other combinations energized the A/C compressor.






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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



(This post was edited by Hammer Time on Jul 5, 2010, 4:31 PM)


mik88
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Jul 5, 2010, 5:20 PM

Post #8 of 9 (3375 views)
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Re: 1996 Ford Ranger 3.1 L Heater switch activates AC cmpressor blows cold air [In reply to] Sign In

Been reading them for some 45 years, heh heh. Unfortunately for me, the only one I could find didn't show it quite that way. Ford had their reasons I'm sure, but thanks for clearing that up. Now I know why the original owner had unplugged the compressor on a working system...

Thanks again, Michael


Hammer Time
Ultimate Carjunky / Moderator


Jul 5, 2010, 5:36 PM

Post #9 of 9 (3372 views)
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Re: 1996 Ford Ranger 3.1 L Heater switch activates AC cmpressor blows cold air [In reply to] Sign In

It's done to remove moisture from the air.

PS, I removed your other question since we answered it here.




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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



(This post was edited by Hammer Time on Jul 5, 2010, 5:39 PM)




1996 Ford Ranger 3.1 L Heater switch activates AC cmpressor blows cold air


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