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Ky_Man
Dodge Dakota
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3/30/2010
19:54:55
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 Subject: A/C blows cold, then musty and warm.
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So, recently my A/C on my truck has been running cold and
great for the first few minutes (driving or just sitting), then the
air gets musty and then blows warm/ just air from outside. I
checked under the hood and the low side pressure with a gauge.
The compressor was not spinning anymore, and the low side
pressure was VERY high, it completely maxed out the pressure
tester. The compressor and clutch work perfectly for those first
few minutes, but once the warm air starts coming out the vents,
the compressor just stops turning.
I'm thinking that there may be a block in one of the lines
because I've read that there is a high/low pressure sensor that
may be turning the A/C off to prevent damage to the system.
Anyone have experience with this?
Other than that I have no clue. It will work just fine a for a few
minutes, then just stop for a few hours. I'm just making an
educated guess as far as the pressure goes, considering there is
a high amount of pressure on the low-side once it shuts off.
Thanks
1997 Dodge Dakota CC SLT
5.2L V8 2WD
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psssst
Dodge Dakota
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3/30/2010
19:58:34
| RE: A/C blows cold, then musty and warm.
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Message:
Does the electric fan stay running while the AC is
on?
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Ky_Man
Dodge Dakota
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3/30/2010
20:39:05
| RE: A/C blows cold, then musty and warm.
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Message:
Oh yeah, I forgot that info. Yes, the fan will continue running.
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psssst
Dodge Dakota
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3/30/2010
23:30:54
| RE: A/C blows cold, then musty and warm.
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Message:
me again
OK could be a clogged orifice valve
also have you checked the condenser?
clogged with dirt, bugs out front?
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Ky_Man
Dodge Dakota
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3/31/2010
01:10:21
| RE: A/C blows cold, then musty and warm.
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Message:
Yes, the condenser is pretty clean, no dirt clogging it or splattered
critters on it as of right now.
Also, could it be the drier/accumulator? I hear the intake to those
can get clogged as well.
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daddio
Dodge Dakota
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3/31/2010
09:02:36
| RE: A/C blows cold, then musty and warm.
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Message:
Your system is low on refridgerant. The reason your low/suction pressure goes up when the compressor is off is that the system pressure equalizes when the compressor is not running. The reason the compressor is cutting out is because the suction/low pressure goes to low.
You probably have a leak somewhere. Add some refridgerant.
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Bob Lincoln
Dodge Dakota
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3/31/2010
10:29:56
| RE: A/C blows cold, then musty and warm.
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Message:
Probably so. But check high side pressure with compressor running before adding refrigerant. If there is a clog, adding more refrigerant may cause the high pressure relief valve to pop.
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daddio
Dodge Dakota
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3/31/2010
11:45:19
| RE: A/C blows cold, then musty and warm.
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Message:
Bob, you are correct about checking both high/ dsicharge side and low/suction side at the same time. But, If the sytem is equalizing as soon as the compressor shuts off, I would not suspect a restriction.
Ky_man, get a decent set of guages and check both sides.
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Ky_Man
Dodge Dakota
JOIN HERE
4/03/2010
00:16:53
| RE: A/C blows cold, then musty and warm.
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Message:
Thanks guys, I'll let you know the the outcome as soon. I thought
it may be low on refrigerant, but I really wanted to make sure about
it all before just adding it to a system that may be full already. So,
I'll check both sides before I recharge or anything.
Thanks
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Ky_Man
Dodge Dakota
JOIN HERE
4/03/2010
18:29:43
| RE: A/C blows cold, then musty and warm.
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Message:
Well, I checked the pressure again. This time I checked it while
the A/C was actually running normally and it was at the correct
pressure it was supposed to be at for the temperature. So,
eventually, it did shut itself off like it always does and the
pressure went up on the low side again. All of the pressure was
fine across the board on both sides while it was running. Does
that mean there is a gap in refrigerant or something, where it
will immediately drop in pressure on the vacuum side and then
just shut off and cause what's on the low side to build up
pressure (like when you turn it off)? Maybe i'll take it in for an
evap and recharge soon, and see what that does.
Any other ideas?
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daddio
Dodge Dakota
JOIN HERE
4/03/2010
18:44:20
| RE: A/C blows cold, then musty and warm.
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Message:
That sounds normal just low on refridgerant. What did the low pressure read right before the compressor shut off? As I posted earlier the system will equalize pressure when the compressor is shut down. It sounds like what is happening with yours is the suction pressure is dropping to low and shutting the compressor off then as pressure equalizes, it rises enough for the compressor to engage again causing the cycling.
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Ky_Man
Dodge Dakota
JOIN HERE
4/03/2010
20:25:44
| RE: A/C blows cold, then musty and warm.
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Okay. I'm going to take it to a shop and get it recharged on
monday. I'll let ya'll know what happens then.
Thanks!
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eric
Dodge Dakota
JOIN HERE
6/25/2010
15:26:00
| RE: A/C blows cold, then musty and warm.
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Message:
what was you final out come. i am having the same issue with my 98 dakota. runs nice and cold when the compressor is on, but after running for a bit the high side pressure goes off the chart, and the compressor stops.
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mac
GenI
7/24/2010
21:20:55
| RE: A/C blows cold, then musty and warm.
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Message:
I would guess it stops because of hi pressure limit switch.
Will stop if low side pressure drops below about 30 as well.
if pressures are wildly off with respect to each other, I think I'd suspect an orifice tube. Fairly easy to fix, and cheap as well ($35 or so, depending on year, etc) if you can discharge, evac, and recharge yourself.
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Nake
Dodge Dakota
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9/09/2010
12:06:09
| RE: A/C blows cold, then musty and warm.
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Message:
My 2000 Dakota had the same symptoms would work fine for any random amount of time and then get warm and humid and not work for a while but completely random.
And this was after a dealer did an A/C service on it. They said I was low on freon but when the dye was injected and they tested for leaks, no leaks were found.
I've since brought it back to the dealer and had a vacuum put on the system for about 90 min to remove any moisture that could be freezing a particular sensor and shutting the the cold air down. When they put the vacuum on it they said one side was extremely high pressure and the other side normal and then they heard a pop and both sides equaled but they are not sure what popped. Anyone have any ideas?? Oh and now the compressor is not cycling anymore either.
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97 DD V8
Dodge Dakota
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8/10/2015
07:20:54
| RE: A/C blows cold, then musty and warm.
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Message:
Anybody know what was wrong with his AC system? KY Man? I have the same exact problem with my 97.
Thanks!
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