Q: Blower motor stops when I accelerate

asked by on August 21, 2016

When driving on the road and I accelerate to pass a car or to increase speed the blower motor stops working until I decelerate.

My car has 144678 miles.
My car has an automatic transmission.

AC is not working Inspection $111.46 - $131.46 Get a Quote

Does the motor stop or is the location of where it blows out of change? What you may be experiencing is that, when accelerating, the intake manifold vacuum is decreased. Vacuum is used to change the vents from defrost to dash to floor. With a loss of vacuum, the system defaults to the defrost position. Check your vehicle for vacuum leaks to make sure it gets the proper vacuum to maintain the vent position. The vacuum canister can also develop small cracks that can reduce the vacuum that is stored for time when you need to accelerate quickly. If you need help finding the source of your concern, a certified technician, like one from YourMechanic, will be able to diagnose the cooling system in order to have this fixed appropriately.

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


Experienced Mechanic?

Earn up to $70/hr

What others are asking

Transfer case adapter leak.
There should be an output seal between the transmission and the transfer case has an input seal with a gasket in between. If any of these are bad it may leak transmission fluid. I would recommend having a certified technician,...
I need to replace the crankshaft sensor. Where is it located in the motor?
Hello. Carbon buildup and other issues can cause these sensors to fail prematurely. You will need to raise the vehicle to access the sensor best. Once below the right, or passenger, side of the vehicle, you will want to look...
Noisy aircon
Hi there. Yes, a low refrigerant charge in the a/c system (https://www.yourmechanic.com/services/ac-recharge) can cause the a/c compressor to make noise. The R-134a refrigerant is what carries the PAG oil throughout the a/c system. A low system charge, results in a...
Cut door trigger wire, reconnected it, and now the anti-theft is on and the car won't crank
Hello, thanks for writing in. If that was the only wire cut, the butt connector may not be sufficient to attach the wires together and they may have to be soldered. Some systems watch resistance readings through the circuit and...
Battery draining when it is cold.
To find the source of the parasitic draw, a proper test must be performed on the vehicle. The test includes using a multi-meter to measure system load while removing fuses or relays. If the system load changes dramatically after removing...
Car shudders when moving off in first gear or in reverse 1974 Ford Mustang II
Hello - although vibration may come from the driveshaft or loose motion in the rear end, this problem starts with the clutch (https://www.yourmechanic.com/question/how-does-a-clutch-engage-and-disengage). This problem is called "clutch chatter", and it involves the clutch grabbing/releasing multiple times in a choppy...
Where is transmission speed sensor on 07 Lincoln MKZ?
Hi there. It is common for 2006 to 2010 Ford / Lincoln transmissions to have problems with the TSS and OSS harnesses. It's attached to the side of the transmission and is very difficult to get to without removing multiple...
2006 Mazda 3 makes a hum sound when accelerating. Sound is louder at higher speeds but stops when car is out in neutral and still
Hi there. If the humming sound is coming from your vehicle while it's in gear, then the likely source is the transmission. It is possible that CV joints or wheel bearings might also be the source of your problem, but...
I have a 2010 Nissan altima it's given me a p1717 code and does not move can anyone help
I have checked this code and there is not a listing that code P1717 applies to this vehicle. You will need to have the computer scanned again and verify the codes stored. Once you get the correct code then let...

Related articles

Top 10 PZEV Cars for Eco-Friendly Drivers
Teddy Leung / Shutterstock.com The whole idea of a PZEV (that is, a partial zero-emissions vehicle), seems paradoxical. You’d think it’d have to either be zero-emissions or not in the category at all. But as contradictory as...
The Best Used Cars to Buy If You're a Skier
When When summer ends, skiers start thinking about hitting the hills, and that means having to contend with winter driving conditions. Not just any vehicle is going to get the job done. We have evaluated several used ski-worthy vehicles, and...
Symptoms of a Bad or Failing AC Accumulator
Common signs you need to repair your AC accumulator include rattling noises during operation, noticeable refrigerant leaks, and a moldy smell.