20 Most Recent 2002 Mercury Grand Marquis - Page 6 Questions & Answers

it sounds like a transmission prob or break or suspension

depends on the engine could be up front by the damper pulley or in the rear of the engine around the flywheel

po340 is a camshaft position sensor code depending on what engine is in your vehicle sensors are located in different places you'll probably need a service manuel

Does it not start or not crank ?If it does not start, you will need to figure out if it is a lack of fuel to the injectors or lack of spark to the plugs to proceed.

Check the limit switch on your brake pedal. Or step on your brake pedal.

It would have to get really hot to damage the seal, but its possible.You will see oil leaking from the seal if it is damaged.

Yes it should have a low press cut off switch to shut the compressor down if press is too low.

probably the refridgerant level is low preventing the compessor to start

You may need to get the ac charged up