Skip the auto shop - Our mechanics make house calls

Q: A/C blows hot air - completely stumped after a number of repairs...

asked by on

I have an 03 TB EXT LT. Dual climate control - digital. A/C blows warm air. If it's 90+ degrees out, it blows around 80 degrees from the vent. The entire way on my 45 minute commute to/from work. We have verified the following: Acuators are working. Low pressure control switch was working. Fuses and relays are working. External temp readings are fine. Blower is fine. Fan clutch was working. Radiator working and coolant levels perfect. We added some Freon after finding it low but no change in temp. Idled for 20 minutes, low pressure a/c do not get cold. We replaced the compressor and accumulator, then vacuumed out the Freon. Vacuum pressure held steady. Started adding Freon. After 1 can, low side was at 40 psi and high was at 285 with vent air reading 80 degrees. Started adding 2nd can when low spiked to 75 while high side dropped to 100. Temp actually rose to 90. We stopped adding Freon at that point as readings were off and we didn't want to damage anything further...

My car has 153000 miles.
My car has an automatic transmission.

A: It sounds like you did not replace the expa...

It sounds like you did not replace the expansion valve when you replaced the compressor and accumulator. The condenser, evaporator should be flushed out also. You should remove and replace the expansion valve filter since it is clogged causing the high pressure and eventual A/C cut off. If you would like to have this resolved, a certified technician from YourMechanic can inspect your A/C system and perform the right repairs.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: My car makes a noise when it's cold

Hi there: This sound could be caused by the actual radiator fan being slightly bent, a drive pulley that's damaged or even the serpentine or drive belt that's wearing out. There are other issues that could be causing this problem,...

Q: ABS/brake lights on

Typically when a vehicle has the ABS light appear on, the brake light will appear right along with it. When this happens, the next step would be to use a automotive scanner to communicate with the ABS module. This will...

Q: Hot air from the AC

Having a broken A/C is very unfortunate, not to mention uncomfortable. There can be several reasons why your Mercury’s Air Conditioning is blowing out hot air and you are correct to believe that the expansion valve could be one of...

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the P0052 code means This code is seen when the Engine Control Module (ECM) tries to control the...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.