Car dies when AC is on

Q: Car dies when AC is on

asked by on July 28, 2017

hi..if i on my ac in my diesel car.. and decrease the speed slightly then suddenly my engine turns off.. especially when the radiator is running.. plz give me a solution.

It sounds like you may have a damaged AC compressor or compressor clutch. As you may know the AC Clutch is the pulley that spins with the Belt. There are two ports on the rear of the Compressor. One is a Suction Port and the other is the Discharge Port. The Suction port is going to be your larger port and the Discharge port is going to be the smaller port. Refrigerant is sucked into the Suction port, compressed and then it exits out the Discharge Port, then entering the A/C Condenser. Your vehicle’s AC Clutch consists of the Hub, the Pulley, and the coil. The front part of the A/C Clutch is the Hub. Next is the pulley, which is where the belt rides. Finally, under the pulley is the coil, also called a field coil. The Coil is a copper would wire, that functions like a magnetic coil. If the AC Compressor is powered up, electricity engages the coil, and when this happens, it also engages the pulley. The large magnet forces the hub to pull against the pulley. Since the Shaft of the AC Compressor is mated with the A/C Hub, once engaged, it begins to pump refrigerant in the system. Turning whenever the engine is cranked, the A/C Compressor Clutch Pulley will spin even if the AC Compressor is off. If the A/C System is turned on, power is sent to your A/C Compressor Clutch and it will then engage. However, if the pressure in the system (or the refrigerant level) is either too low or high, switches will kill power to the Compressor to keep from damaging it. I would suggest having a professional from YourMechanic come to your location to take a look at your vehicle.

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

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

Jerking while accelerating now it won't start had to get tow home car felt as if it was rolling

Based upon the symptoms you are describing, it sounds like you may have a faulty camshaft position sensor. The camshaft position sensor is a magnetic sensor that monitors camshaft speed to regulate ignition timing and fuel injection timing. It gathers...

Fuel burns and car jumps when stopped

Whatever is causing your car to run rough is probably also causing it to drink gas. Look under the hood for any vacuum lines that may be off or in bad condition. It's surprising how many problems you can solve...

What factors affect fuel economy?

Your Accord came with a window sticker that explained the miles per gallon the car was rated for under different driving conditions, such as highway driving, city driving, and also provided a combined total. It’s important that you understand these...

Related articles

P0684 OBD-II Trouble Code: Glow Plug Control Module to PCM Communication Circuit Range/Performance
P0684 code means there is a failing connection within the Glow Plug Control Module often due too corroded wires and solenoid failures.
P2176 OBD-II Trouble Code: Throttle Actuator Control System - Idle Position Not Learned
P2176 Code Definition Throttle Actuator Control System - Idle Position Not Learned What the P2176 code means The P2176 trouble code...
How Does an Engine Idle High and Low?
A common problem that car owners experience is high or low engine idle. A damaged intake gasket, cold air intake, or PCV valve can cause idle issues.