Skip the auto shop - Our mechanics make house calls

Q: Blower Motor works but A/C Shifts to Vent towards windshield when accelerating. Cruise control doesnt work. Vacuum Lines?

asked by on

My A/C was working fine, but recently when accelerating/any demand is placed on the engine, the vents pointing toward driver/passenger divert to the ones which are used to defrost/de-humidify the interior of windshield. I have read that this is a common issue with 2nd Gen Ram 1500s... something to do with insufficient vacuum due to a leak in vacuum lines. Cruise control also doesn't work. Electrical/indicator light for "CRUISE" comes on, but set speed button will not hold. Can these be related?

Thanks, J

My car has 132000 miles.
My car has an automatic transmission.

A: Hi and thanks for contacting Your Mechanic....

Hi and thanks for contacting Your Mechanic. The issue is there is a vacuum hose that is either burned with a hole or the hose is cracked. Open the hood and check for any vacuum hoses to the cab that may be disconnected or have a hole in it. If all of the vacuum hoses are in good shape, then check under the dash for the vacuum hoses. If the hoses are in good shape, then you will need to replace the vacuum blend door actuator. If you find a hose that is burned, cracked, or has a hole in it, replace the vacuum line and retest your a/c. If you need further assistance diagnosing your a/c issue, then seek out a professional, such as one from YourMechanic, to help you with your vehicle.

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: Grinding and squeaking noises from front end

Most modern vehicles do not have serviceable ball joints (grease fittings that allow them to be lubricated). They are lubed and sealed from the factory. Once the grease dries or decays over time, the ball joint will basically wind up...

Q: rough idle dies at 65 hesatation

Hello. Thanks for writing in about your 2002 Chevrolet Silverado. This can be caused by a number of things. Most of the time this will cause a Check Engine Light to come on if there is a powertrain issue. If...

Q: Air conditioning has slow leak

There is specialized equipment for finding leaks in AC systems. One way is to add a fluorescent dye the the system, run the system, and check for a leak with a black light. There are also electronic tools to detect...

Related articles

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.
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.