Q: AC blows cold until engine warms up.

asked by on

4.8 liter V8, AC is full of refrigerant, verified with gauges. I cleaned the condenser out with a hose last year when I replaced the radiator. I had the AC serviced last July and they did a vacuum test and it held pressure. They put in .81 lb of refrigerant and it was fine the rest of the summer.

My car has 223000 miles.
My car has an automatic transmission.

A: You do not mention what kind of vehicle you...

You do not mention what kind of vehicle you have, but I can tell you that if they only put in .81 lb of Freon then your system is likely low on Freon. Most systems take more than 1.5 lb of Freon. If you are just using your A/C after not using it during winter time then you may have leaked some Freon out.

You should have the A/C system checked to see if it is running at the correct pressures when the vehicle is warm. Depending on the vehicle and outside temperatures, your pressures should be about 30 on the low side and 200 on the high side. These pressures are not exact, and will vary, but would give indication of problems if your pressures at idle are way off from these pressures. I'd recommend having the system checked by a qualified mechanic, they will be able to perform these tests and accurately diagnose your A/C issue. Once that is done, the necessary repairs can be made.

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・Save up to 30%

Get a quote

What others are asking

Q: car loses power, hesitates, and miss fires

From the symptoms described, it does seem that your BMW is unfortunately experiencing engine misfires. However the source of these misfires can really be caused by multiple sources, from worn out spark plugs, to even a failing mass air flow...

Q: Door hinges lubricated properly

Hello. I would suggest that you try using white lithium grease. This is the best way to lubricate door hinges, but it may leave a white film on the hinges. Although this may be a bit unappealing, it may be...

Q: Interior lights blink on/off & car quits on interstate on my 2001 Chrysler LHS

Hey there, thanks for writing in about your 2001 Chrysler LHS. The body control module (BCM) controls the interior lights for this vehicle. The BCM gets inputs for the interior lights to come on by any one of the door...

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 Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...