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97 Dakota A/C issue

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Jul 27, 2011, 7:20 PM

Post #1 of 2 (1486 views)
97 Dakota A/C issue Sign In

1997 Dodge Dakota 3.9L 2wd automatic

Background: A/C refrigerant reservoir had been empty and not used for a long time (years)

Happening: put full can of 134A refrigerant into A/C system recently, conducted load as per directions and all seemed to go well. No leakage and as it reached 120psi during the upload the compressor came on. This was the first time I had heard or seen the compressor working on this truck. I did have some cool air from the A/C afterwards but it wasn't what I would consider cool enough. I chalked that up to needing another can of refrigerant to top up the reservoir.

Issue: the compressor now activates every 5-10 seconds during all functions of the air selection switch. i.e. the compressor is activating even when the A/C is not selected. If I select one of the other non A/C vents the compressor should not be on. It's acting like it thinks the A/C is now on all the time in any mode. The only way to have the compressor stop is to shut the air selection switch to off.

I hope I've explained this okay. Does anyone have any idea why the compressor is on all the time now? (except when the switch is in the OFF position).

btw, there are no fault codes coming up via the computer.

(This post was edited by Hammer Time on Jul 28, 2011, 3:08 AM)

Hammer Time
Ultimate Carjunky / Moderator
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Jul 28, 2011, 3:11 AM

Post #2 of 2 (1459 views)
Re: 97 Dakota A/C issue Sign In

The Windstar stuff is in your signature so go to edit your profile to delete that.

The answer is the same here as you got on the other site. The A/C runs in defrost also to remove moisture. You may have a bad control head but no one can confirm that without using a wiring diagram and testing.


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