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?

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: Is there any reason that a transmission fluid leak issue has to do with needing a a/c compressor replacement? 2008 Jeep Liberty

Hi there - these 2 faults are NOT connected. A transmission fluid leak will not cause AC compressor failure. You are not getting good advice from whoever told you this - not to be trusted. A transmission fluid leak can...

Q: My Check Engine Light came on. I fixed the issue, but the light quickly came back on. Will it turn itself off?

Just because a code is displayed does not mean that part is bad in all cases. The code is used as a tool to diagnose the problem. You may have to have the code diagnosed by an experienced mechanic like...

Q: Fan stays on when car off

The blower motor resistor seems to be a common repair on your car. It can cause the blower motor to run when the key is off. The heat and AC and your car has a dedicated computer. It also could...

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...