Skip the auto shop - Our mechanics make house calls

Q: HVAC is not working right

asked by on

My heating, ventilation, air conditioning system isn’t working right. When I turned off the air conditioner it would come right back on and the fan would go faster. If I turned it up higher the fan would go faster and slower and faster and slower. The RRR mode selector is working, but the white lights aren’t on two of the switches. Do you know if I can fix this myself or will I have to replace the system?

Hello. This is a programming problem. It is common on this vehicle. The HVAC module needs to be reprogrammed by the dealer to take care of this. Some of the time, the module will need to be replaced but most of the time the reprogramming will take care of it.

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: Hard shifting and thunking noise at the rear end

Hello. The shift lever should remain stable unless it's moved by the driver. If it pops out of gear, even after a transmission replacement, I suggest inspecting the transmission mounts, engine mounts, and subframe bushings. Cases show that the subframe...

Q: When A/C unit is off, vents still have air flow

This type of ventilation is typical on most cars. Try setting the controls to "Recirculate" mode and see if that helps. The Recirculation setting typically closes off the flow of outside air from entering the passenger compartment. At highway speeds,...

Q: Throttle control warning light is on and I have no power.

Hi there. The code P2127 is coming on for the throttle position sensor being disconnected or not communicating with the ECM (computer). Check the throttle position sensor to see if the resistance changes when the throttle is opened and closed....

Related articles

What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...
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.