Skip the auto shop - Our mechanics make house calls

Q: My interior A/C, heater fan doesn't work

asked by on

Two or three time a week, the engine dies when I apply the brakes very hard while I'm on a surface street. When I restart it, the engine does fine at first. Also, the air filter was replaced recently and I had the oil changed the same day. There had been a hole in the master cylinder, so the mechanic replaced that too. What do you think the problem is?

A: The first thing to check, is to see if when...

The first thing to check, is to see if when you press the brake with the engine idling and is in park or neutral whether the engine runs rough or you hear a hissing noise under the dash. If you do, then the brake booster is leaking into the engine vacuum and will cause the engine to stall. When the master cylinder was replaced maybe the seal on the booster did not seal or the brake booster is leaking. Either way have the mechanic that did the master cylinder check his work to see if it was something he did. If you need a second opinion or would like to have this checked by an outside source, then have a certified mechanic, such as one from YourMechanic, diagnose your AC system for you.

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: Misfiring on a 2003 Audi A4 3.0

You've got to replace the cover gasket valve that's leaking oil in the spark plugs. But that's not going to get it to run better right away. But I would change that. If it's running poorly, it's not going to...

Q: Air conditioning not working well

A very common culprit for low A/C temperature is a part called a cabin air filter. I have seen many cases where responsible car owners did not even know that it existed. If the A/C system seems to be operating...

Q: Timing belt off track

A timing belt that appears to be slipping its way off its gear, or coming off track, is an indication that the timing belt is loose. When the timing belt starts to slide off its gears, it can rub against...

Related articles

How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the P0052 code means This code is seen when the Engine Control Module (ECM) tries to control the...
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...