Skip the auto shop - Our mechanics make house calls

Q: Air conditioning only blows hot air after having a blown and replaced fuse

asked by on

I accidentally shorted the wires in one of the vanity mirrors, after which all interior lights went out and the air-conditioning lost the ability to produce cold air.

I replaced the blown fuse (number F49, which is listed as being for the airconditioning ECU as well as the various courtesy lights) and the interior lights came back on, but the aircon still only blows hot air.

I looked at the fuses that according to the manual are related to the air-conditioning, but the ones I checked looked fine.

My car has 57000 miles.
My car has an automatic transmission.

A: Hi and thanks for your question. In the A/C...

Hi and thanks for your question. In the A/C circuit to the compressor clutch from the switch, there is an inline fuse. Check continuity from the switch to the clutch on the compressor. If you have high resistance or if the meter reads out of limits, then the wire has a break in it. Find the break and fix it. When shorting wires, electricity will find it least past back to the battery so check all of the circuits that relate to the connections that you accidentally shorted. If you need further assistance with the wiring, then seek out a professional, like one from YourMechanic, to diagnose the electrical issue in person and move forward with correct 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

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 console is not working can't turn on my air or radio.. Can't defrost

Hello. I would start by load testing the battery and the alternator. Most of the time when this happens all of a sudden it is because there is a loss of voltage in the electrical system. If that is fine...

Q: Acceleration problem

Hey there. This may be related to a fuel delivery issue such as a faulty mass air flow sensor or throttle position sensor. As you may know, the mass air flow sensor regulates the air intake as it is mixed...

Q: Ac question

The most likely issue is the blower motor is not turning on. There are two in your car, one for the front, and one for the rear. Turn off the rear blower motor, and you should hear the front...

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...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...
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.