Q: My 2001 automatic Miata idles really rough at stoplights when I run the AC, but not when it is off.

asked by on

When I stop at stoplights with my AC on and the transmission engaged, the car idles very rough. When driving or when in park with AC on it runs smooth with no problem. I just had all new belts installed, plus a new flex/fly wheel in the transmission. My mechanic says I now need a new AC compressor and a two other parts to fix this problem. Does this sound like the correct solution?

My car has 73000 miles.
My car has an automatic transmission.

Hello, thank you for writing in. Two aspects about the issue lead me to believe the previous technician is correct. To start, the compressor is the only component that will effect the engine, as it is the part connected to the engine via the drive belt (which is turns powers the entire AC system). If the compressor is causing extra strain on the drive belt and engine, everything else the drive belt and engine are connected to are also effected. This causing many issues. Secondly, the drive belt was just replaced, so we know it is not a drive belt issue. As to the other components he wants to replace, there is no way to tell if that is needed or not. For a quote or help from our team, contact the service department to schedule an appointment.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. My 2001 automatic Miata idles really rough at stoplights when I run the AC, but not when it is off.

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: Transmission making whirring sound

This is a common issue with Mazda transmissions. There is an additive I recommend for the issue. It is called "instant shudder fix." It comes in a little red tube, and although may be pricey, it usually solves the Mazda...

Q: How much to flush the ac system

Hi Short, Thank you for contacting YourMechanic! To set up the quote for the AC flush for your vehicle, we need some extra information in order to get you the most up-to-date prices on parts and labor. To verify...

Q: My heater blows out warm air instead of hot air when my temperature dial is turned as hot as it can go.

Hello there, warm air coming from the vents on your 2001 Ford Taurus will be caused by a variety of issues. The heating system for your vehicle and the air conditioning system are completely separate and likely unrelated. A low...

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...
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...
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...