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post #1 of 5 Old 09-11-2019, 10:42 PM Thread Starter
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Recirc sucks when not sucking

1989 Plymouth Acclaim 2.5turbo with A/C
Problem is recirculation mode. If the car is idling or revved in Neutral or park its fine. I but the car in drive and the system goes to FLOOR mode, I let up on the gas and goes back to AC recirc. I checked the usual suspects. The recirc door doesnt move. Its the actuator by the steering column that moves, but it holds vacuum. Any ideas?
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post #2 of 5 Old 09-12-2019, 05:33 AM
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Re: Recirc sucks when not sucking

what do you mean 'The recirc door doesnt move.' ?
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post #3 of 5 Old 09-12-2019, 10:34 AM
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Re: Recirc sucks when not sucking

I have the same exact problem and I have not looked into it yet.
Now that I am retired and my driving is usually only on weekends and with summer being almost over I probably will not look into it this year.

I also have a problem with the mode doors not sealing properly so when on defrost I also have air coming from the floor, knowing this I am assuming I am losing vacuum and going to default which is defrost, it sounds like the same is happening to your vehicle.

My first thought was a vacuum issue due to a faulty underhood check valve, I replaced it and no change.
That would mean that vacuum is not being held in the system during acceleration/low vacuum conditions due to a leak on the inside, either from the control unit, vacuum harness or a mode door actuator.

Looking at the diagram you will see that the recirculation door actuator and heater control valve underhood receive vacuum from the same source at the control unit.
Recirc sucks when not sucking-hvac-88-89-ex.l-body.jpg

You are going to have to connect a vacuum gauge inline to both components and see what vacuum does at idle and acceleration and if vacuum is present when it is supposed to be.

If you find your problem you will probably also find my problem.

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post #4 of 5 Old 09-12-2019, 11:04 AM Thread Starter
Garrett Booster
 
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Re: Recirc sucks when not sucking

yeah finding this stuff is a pain in the butt. Esp for a big guy who doesnt fit well under the dash. Im leaning towards the control unit. I checked all the lines I could see and tried a bunch of different things. My vacuum gauge is of course in California and Im in Georgia. I might say eff it and have my ac place diagnose it. Id like recirc for the desert but the ac works fine in regular. But if I find anything Ill keep you posted

NAJ I thought maybe the recirc door would open but now that its not 2 am or so I realize that was dumb and another actuator is probably screwing up or said control unit
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post #5 of 5 Old 09-12-2019, 11:32 AM
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Re: Recirc sucks when not sucking

I have another control unit for my car but due to age the plastic housing/dash panel where the unit bolts to has crumbled and fallen apart, I repaired it with Plastic Weld (and other things since the entire sections where the mounting holes were disintegrated) about 5 years ago but I am afraid to even attempt to remove it unless it becomes absolutely necessary.

Keep me posted on what you find.
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