Anyone had a problem with a grunt or knock on startup of thier AC system? I hae had it looked at twice and both times was told its "Normal" with the new style AC compressor and R134.

Its very loud and shakes the whole truck...


Anyone?

 

I have it, as well as seen it written about on boards.

It doesn't sound normal but I have 28000 on my 2004 expy and it still works.

The first time I started the truck at the dealer when I bought it it did it.

Good luck---Bob

 

Whats funny is mine never did till about 4 weeks ago. I dont buy into this "Normal" noise. I know in the HVAC industry when a compressor makes sounds like that its going south. We will see I guess...


Thanks!

 

whatsup richard, long time no see. I don't work for ford anymore, i do IT work for a healthcare co., but we used to have to explain that to customers all the time. Some will do it, while other vehicles will only do it every once in a while. I have a 2003 Navigator now, and it has done it once or twice. Here is what ford has to say about it.


SOME 2003-2004 EXPEDITION/NAVIGATOR VEHICLES MAY EXHIBIT A MOMENTARY GRUNT/POP FROM THE A/C SYSTEM WHEN THE COMPRESSOR IS ENGAGED AFTER THE VEHICLE IS PARKED FOR A WHILE, BEFORE THE ENGINE COMPARTMENT HAS WARMED UP. THIS CONDITION IS DUE TO REFRIGERANT BEING PUMPED OUT OF THE COMPRESSOR. WHILE MANY VEHICLES HAVE PCM STRATEGIES THAT ADDRESS THIS BY REPEATEDLY CYCLING THE COMPRESSOR ON START-UP, THIS MAY NOT COMPLETELY ELIMINATE THE NOISE. THIS IS A NORMAL CHARACTERISTIC AND REPLACING A/C COMPONENTS WILL NOT ADDRESS THIS CONDITION, SO DO NOT ATTEMPT REPAIR. TO MINIMIZE THE NOISE, TURN THE A/C SYSTEM TO VENT BEFORE EXITING THE VEHICLE, AND IN MILD AMBIENT TEMPERATURES (50-75F/10-24C) WAIT A FEW MINUTES BEFORE TURNING ON THE A/C OR DEFROST.