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#11693411 - 06/28/16 10:01 AM Truck AC issues.
KingwoodCat Offline
TFF Guru

Registered: 10/30/04
Posts: 35387
Loc: Broaddus TX
I've been having issues with the truck AC since October. Compressor and Accumulator have been replaced in the past couple of years. I bought an infrared thermometer to provide the AC folks with some data. AC starts off cold. 48 degrees coming out of the duct. Running down the highway an hour and it is now 68 degrees coming out of the duct. Another half hour and it is 78 degrees. A half hour later 88 degrees. Shut off the AC and drive a half hour, and start the AC and it's back to cooling at about 68 degrees. I think the compressor is freezing up. If so, why? What say the TFF?
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#11693459 - 06/28/16 10:20 AM Re: Truck AC issues. [Re: KingwoodCat]
Nathan "Bull" Montgomery Offline
TFF Celebrity

Registered: 02/23/11
Posts: 5649
Loc: Fort Worth, Tx.
Maybe the condenser is clogged with dirt/grime/debris? What kind of vehicle is it? I know on some of the Ford Super Dutys that if they are used offroad in dirty dusty condition the evaporator core inside the a/c case can become clogged as well. Id check that first.

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#11693478 - 06/28/16 10:30 AM Re: Truck AC issues. [Re: Nathan "Bull" Montgomery]
KingwoodCat Offline
TFF Guru

Registered: 10/30/04
Posts: 35387
Loc: Broaddus TX
Originally Posted By: Nathan "Bull" Montgomery
Maybe the condenser is clogged with dirt/grime/debris? What kind of vehicle is it? I know on some of the Ford Super Dutys that if they are used offroad in dirty dusty condition the evaporator core inside the a/c case can become clogged as well. Id check that first.


Dodge 6.7 Cummins Mega Cab 4WD. Not operated in a real dusty environment though.
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"Any man who thinks he can be happy and prosperous by letting the government take care of him had better take a look at the American Indian".

Henry Ford

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#11693490 - 06/28/16 10:36 AM Re: Truck AC issues. [Re: KingwoodCat]
Cast Offline
TFF Team Angler

Registered: 07/31/12
Posts: 3567
Loc: North Texas - God's Country
It won't freeze with 48 degree air. It's broke again. The air should get colder but stay at about 40.
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#11693492 - 06/28/16 10:37 AM Re: Truck AC issues. [Re: KingwoodCat]
redchevy Offline
TFF Celebrity

Registered: 01/25/05
Posts: 6055
Loc: texas
Not sure if it is involved in the air flow to the cooling system componets or if it just filters the air coming into the cabin, but have you checked to see if your truck has a cabin filter? and has it been changed?

I changed the one on my last car at 100k for the first time and I'm amazed air even came out the vents that thing was so filthy. Just an idea to check, I have no idea if it could really be the problem or not.

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#11693518 - 06/28/16 10:49 AM Re: Truck AC issues. [Re: KingwoodCat]
bronco71 Offline
Pro Angler

Registered: 02/05/06
Posts: 946
Loc: Farmers Branch/Sulphur Bluff
Have no idea about the Dodge but the Ford trucks I have had in the past had an orifice tube in the line that would clog up, especially after a compressor failure/replacement, changed it out and had cold air again.

I don't know what Toyota does different but I have had my Tundra for 10 years and it still blows cold as day 1 and I've never done a thing to it.

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#11693634 - 06/28/16 11:31 AM Re: Truck AC issues. [Re: bronco71]
KingwoodCat Offline
TFF Guru

Registered: 10/30/04
Posts: 35387
Loc: Broaddus TX
Originally Posted By: bronco71
Have no idea about the Dodge but the Ford trucks I have had in the past had an orifice tube in the line that would clog up, especially after a compressor failure/replacement, changed it out and had cold air again.

I don't know what Toyota does different but I have had my Tundra for 10 years and it still blows cold as day 1 and I've never done a thing to it.


The tube was the last thing that was replaced. It was clogged, but obviously not the real problem.
_________________________
"Any man who thinks he can be happy and prosperous by letting the government take care of him had better take a look at the American Indian".

Henry Ford

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#11694199 - 06/28/16 03:42 PM Re: Truck AC issues. [Re: KingwoodCat]
TITANIUM-BACK Offline
Pro Angler

Registered: 09/03/12
Posts: 807
Loc: Lake Lavon,Tx.
fist thing you need is pressure reading at idle with a/c on max with driver window down, then a reading at truck idling at around 2-2,300 rpm you can use a stick. Could be low charge, accumulator went bad. It doesn't matter what environment you drive in I have stuff come in here at the house looks clean but you remove the top plastic cover and start blowing stuff out you would be surprised at the [censored] that comes out of the radiator, charge air cooler and a/c condenser. All 3 of those things need to be clean in order to achieve maximum air flow across the a/c condenser.
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#11696051 - 06/29/16 02:18 PM Re: Truck AC issues. [Re: KingwoodCat]
TX0303 Offline
Outdoorsman

Registered: 03/19/15
Posts: 104
Loc: WilCo
Have you checked the blend door operation? Maybe it's opening up slowly and letting hot air in.

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#11696770 - 06/29/16 09:33 PM Re: Truck AC issues. [Re: TX0303]
smooth move Offline
Pro Angler

Registered: 10/14/12
Posts: 849
Loc: bayou vista,tx
Originally Posted By: TX0303
Have you checked the blend door operation? Maybe it's opening up slowly and letting hot air in.

what he said.
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#11698108 - 06/30/16 02:49 PM Re: Truck AC issues. [Re: KingwoodCat]
HaulinBass02 Offline
Angler

Registered: 06/30/05
Posts: 449
Loc: Springtown, TX
Why was the compressor replaced? If it went out catastrophically, then the actual recommendation is to replace the condenser too. This is because the condenser lines on the newer vehicles are too small to flush out and debris can and will get trapped in there causing cooling issues.
On my truck, the evaporator coil under the dash was dirty and it stopped blowing cold because it was freezing up due to moisture buildup in the dirt and grime. Basically the dirt and grime prevented the moisture to condense and drain away and it caused freezing on the surface. I had to pull the dash and replace it. I'm a DIYer and it took me 3 hours start to finish to pull the dash, replace the evap coil and the heater core (cheap insurance). I had to do the whole system though because the compressor was making funny noises too.
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#11698362 - 06/30/16 05:52 PM Re: Truck AC issues. [Re: KingwoodCat]
Allison1 Offline
TFF Guru

Registered: 12/14/03
Posts: 15783
Loc: Grand Prairie, Tx
Have you seen the drain putting out water. Just a shot but if its blocked it will do what you are seeing.
Mine was blocked a couple years ago. After putting a little shot of compressed air the thing drained something like 3 quarts of water. A wire up the drain a couple times shook some junk loose and it hasn't occurred since.

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#11718315 - 07/12/16 09:07 AM Re: Truck AC issues. [Re: Allison1]
KingwoodCat Offline
TFF Guru

Registered: 10/30/04
Posts: 35387
Loc: Broaddus TX
Originally Posted By: Allison1
Have you seen the drain putting out water. Just a shot but if its blocked it will do what you are seeing.
Mine was blocked a couple years ago. After putting a little shot of compressed air the thing drained something like 3 quarts of water. A wire up the drain a couple times shook some junk loose and it hasn't occurred since.



Draining fine. I'm taking it back to the mechanic on the 25th and giving him instructions to fix whatever it is. I moved to the lake last week in a truck that the AC lasted for an hour at a time on a 2 1/2 hour trip. This is what I know about the AC. It starts out when it is cool outside early in the morning and puts out 45 degree air (Infrared thermometer). Running down the highway and within a half out the output temp is 60 degrees. Another half hour and it's 75 degrees.
At that point I turn it off for a half hour, start it back up and its putting out 65 degree air for about 20 minutes, then it goes back to 75 degrees.
_________________________
"Any man who thinks he can be happy and prosperous by letting the government take care of him had better take a look at the American Indian".

Henry Ford

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#11718404 - 07/12/16 09:44 AM Re: Truck AC issues. [Re: KingwoodCat]
Cast Offline
TFF Team Angler

Registered: 07/31/12
Posts: 3567
Loc: North Texas - God's Country
That is annoying. I parked my GMC when the AC went out.
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#11718774 - 07/12/16 12:56 PM Re: Truck AC issues. [Re: Cast]
KingwoodCat Offline
TFF Guru

Registered: 10/30/04
Posts: 35387
Loc: Broaddus TX
Originally Posted By: Cast
That is annoying. I parked my GMC when the AC went out.


I can afford to let it set up until the last week I am in Houston as I am retiring at the end of the month. The plan is to drop it off at the mechanic shop and let them keep it until they've fixed it.
_________________________
"Any man who thinks he can be happy and prosperous by letting the government take care of him had better take a look at the American Indian".

Henry Ford

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