Skip the auto shop - Our mechanics make house calls

Q: Low and high pressures stay low regardless of rpm, even while adding more than required r134a

asked by on

Same as above, no cold air, very little drip from evaporator, cold line sweats very little. Compressor runs without any excessive noise. I'm suspecting expansion valve trouble.

A: Hello. I would need to know more informatio...

Hello. I would need to know more information about the type of vehicle this is to know for sure what is going on. Most of the time though, if you have low pressure on both sides it is caused by low refrigerant. If the refrigerant level is fine, then it is either caused by the expansion valve or the compressor has an internal valve problem. Both can occur and cause this. I usually check the pressures and the line temperatures to determine which one it is. If you are planning on having this AC cooling issue fixed, consider YourMechanic, as a certified mechanic can come to your home or office to diagnose the AC system and help you move forward with 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: AC clutch fan relationship

The fan is kinda related, in that it is needed and commanded by the AC system to help cool the hot condenser. Its electrical circuit is separate from the AC electrical circuits. Definitely check the fuses first, then check...

Q: AC stopped working

The clutch on the air conditioning compressor is a common failure item and the complete compressor is usually replaced. Once the system is opened, the receiver/dyer or accumulator must be replaced at the same time to ensure proper system operation....

Q: Coolant fan runs continuously? What can it be?

Hello. Most of the time on this vehicle the issue is caused by a failure in the fan control module. It typically has an internal short that causes this. I usually test the circuit to make sure that the computer...

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...
How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.