Q: My a/c blows warm when switched to drive. What can cause this?

asked by on

My a/c blows cold in park but when I put it in gear it blows hot.

Hello, thank you for writing in. There is a chance you may have a vacuum leak. You will need to check for them physically, or have a technician do so. Typically the vehicle has more power when at higher RPMs and the air conditioning works better. If you have a bad connection to the evaporator, compressor, or condenser the extra power needed by the engine in drive may be overruling the air conditioning. Only further inspection will tell. For more help, contact our service department to schedule an appointment.

Was this answer helpful?

Hi there. In most cases, an obstruction of dirty, debris or other materials on the AC condenser will cause this type of problem. However, a refrigerant leak, loose hose or pressure problem will also be the source of a malfunctioning AC system while the vehicle is in motion. You might want to have a professional mechanic come to your location and complete an AC is not working inspection to correctly isolate the source of this problem, so the right repairs can be made.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. My a/c blows warm when switched to drive. What can cause this?

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: What does the “CHECK BRAKE SYSTEM” warning mean in the message center?

Quite a few different warning messages can be displayed in your car’s message center. If you see one that reads “CHECK BRAKE SYSTEM,” it means that the car’s computer has detected a problem with the Brake system and it needs...

Q: Nissan Altima rumble

The rumbling is caused by an imbalance problem with one of your axles or one or more of the tires. Even though you had the tires balanced, that does not mean your tires do not have a balance issue at...

Q: Advice on buying a 1997 Volvo S70 with 190,000 miles

If it's a running car and it runs good--that's what that car probably would go for. I personally wouldn't buy an S70 because I work on them for a living. I've worked on quite a few of them and they...

Related articles

P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
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...
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.