Skip the auto shop - Our mechanics make house calls

Q: When I cut ac on my truck idle goes down two or three times the truck stalls

asked by on

Yeah I had a diagnostic done on the truck and camshaft position sensor came up so I changed it plus the crankshaft position sensor and I ran the truck for about 5 minutes and the problem started again when I cut my AC on the truck stalls I was just wondering what else could be the problem could it be a throttle body position sensor maybe

My car has 200000 miles.
My car has an automatic transmission.

A: The first thing to do is disconnect the A/C...

The first thing to do is disconnect the A/C compressor and then turn on the A/C and see if the engine still stalls. If it still stalls, then you have a problem with idle control circuit and would need further diagnosis. If the engine idle goes up, then connect the A/C compressor so it kicks in and see if it kills the motor, then you may have a compressor locking up and stalling the motor. The A/C pressures will need to be checked and monitored to see if the high pressure goes too high indicating an A/C problem that will need a mechanic to diagnose in person to see what is causing the A/C pressures to be so high. If you need help with this, have a professional, such as one from YourMechanic, inspect your truck’s stalling issue and let you know what needs repair.

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

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

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: Car will not shift, speedomete is erratic..

Hey there: It's possible that the speedometer sensor is the source of your shifting and speedometer issues. The speedometer sensor is designed to register the driveshaft’s rotational speed and relay this information through the speedometer cable and to the vehicle’s...

Q: Air won't blow

This is a very common problem for your type of vehicle. Most likely what has happened is that the blower motor is going bad. As a result of that, it is drawing too much current. What is likely to be...

Q: Left turn signal malfunction.

Check the bulb contacts, front and rear, and just make sure there is no obvious corrosion. Check the headlight harness connection to the headlight bulbs as well. From what you are describing, there is some sort of short or voltage...

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...
What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...