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sprinkles08
sprinkles08, ASE Certified Technician
Category: Cadillac
Satisfied Customers: 22301
Experience:  ASE Master and Advanced level certified. Factory trained with 15 years dealership experience
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Have a Dts and it will blow cold air on both sides they it

Customer Question

Have a Dts and it will blow cold air on both sides they it goes to warm air. any ideas
Submitted: 10 months ago.
Category: Cadillac
Expert:  K. Wiggins replied 10 months ago.

Are both sides going warm or just one? Does the AC compressor stay engaged when this happens?

Customer: replied 10 months ago.
the air compressor is engaged and both sides are both blowing warm air.
Expert:  K. Wiggins replied 10 months ago.

Thanks, ***** ***** temperature is set to manual instead of auto does it do this as well?

Customer: replied 10 months ago.
it does.
Customer: replied 10 months ago.
Believe it or not I have another Cadillac in the shop doing the same thing this morning.
Expert:  sprinkles08 replied 10 months ago.

Hello and welcome to JustAnswer!

The first thing I would suspect if this is happening while sitting or at low speeds is the cooling fan not working. If the fan isn't working at all or is running slowly then a/c high side pressure will increase and it will start blowing warmer air.

Does it blow cold while driving at highway speeds?

Customer: replied 10 months ago.
It will sometimes but not all times.
Expert:  sprinkles08 replied 10 months ago.

are you able to monitor pressures?

Customer: replied 10 months ago.
No not here.
Expert:  sprinkles08 replied 10 months ago.

Are you able to check for fault codes?

Customer: replied 10 months ago.
I hooked my scanner up ad it said no codes but I can get it to command anything either. I noticed the compressor is not on so I commanded it to come on from the scanner and it keeps telling me to check my leads and make sure the key is on. All tht is good, is there a fuse somewhere were I am not able to communicate with computer in car???
Expert:  sprinkles08 replied 10 months ago.

What module are you trying to communicate with?

Customer: replied 10 months ago.
A/C control module
Expert:  sprinkles08 replied 10 months ago.

Do any control head functions work?

Customer: replied 10 months ago.
the control head works on the car. Were it says shut passenger side off, does not work, when you push ac it doesn't come on all the time.
Expert:  sprinkles08 replied 10 months ago.

Are there any codes in the PCM?

Customer: replied 10 months ago.
No codes
Expert:  sprinkles08 replied 10 months ago.

What does the PCM show for a/c pressure?

Customer: replied 10 months ago.
my gauges outside show low side @35psi and high side @130psi and the low side line is cool to touch.
Expert:  sprinkles08 replied 10 months ago.

What does the PCM show compared to the gauges?

Customer: replied 10 months ago.
For some reason I can not get my scanner into that section
Expert:  sprinkles08 replied 10 months ago.

Either way, if you had 35 PSI on the low side and only 130 then the system is either undercharged or the compressor is weak.

Customer: replied 9 months ago.
Ok I am back, I put a new air conditioner system on this and in the stall it go to 62 degrees and I went for a drive and it started blowing warm air and I stopped and noticed the compressor clutch was not running. got back to shop and put gauges on it and the high side was 225 and the low side was 48. Shut the car off wanted a little bit started it back up and the compressor was engaged and it got it down to 68 inside and the compressor shut off. Any suggestions. Thanks Eddie
Expert:  sprinkles08 replied 9 months ago.

What exact components were replaced and where were they from?

Customer: replied 9 months ago.
Compressor, orifice tube receiver dryer and they were four season components
Expert:  sprinkles08 replied 9 months ago.

How was it charged?

Customer: replied 9 months ago.
I put 2.8 oz. of pag oil and 22 oz. of R134
Expert:  sprinkles08 replied 9 months ago.

What was the vent temp when the pressures were 48 and 225?

Customer: replied 9 months ago.
They went to 62 then the compressor shut down. then the temp went up of course but the compressor would not come back on until you shut the engine off for 30 minutes and then the compressor would come back on and get it back to 62 at the vents then shut down again.
Expert:  sprinkles08 replied 9 months ago.

I'd have a look at evaporator temperature and see if it's showing low than it should be. If it's incorrectly low then the compressor will be turned off and not allow proper cooling.

Customer: replied 9 months ago.
Ok help me here how do I do that?
Expert:  sprinkles08 replied 9 months ago.

A scan tool would be necessary to monitor data to see why the compressor is being disabled.