My 2003 Toyota Echo produces a loud vibration with the A/C on at engine speeds of about 1800 - 2000 RPM. This occurs both in Drive and Park. The sound is coming from the right side of the engine compartment. The noise disappears at lower and higher RPM. it does not occur with the A/C off.
Change the a/c compressor's bearing or service the compressor.
My 01 Echo started to make a loud screeching sound when I turned on the A/C and progressively got worse. It got so bad it even made noises when I ran the fan only. Nothing I tried worked, resin on belt, replacing belts, etc., and everyone I asked had no answers. Then a strange thing happened, I replaced the spark plugs and the noises went away. Now I may get a few noises if I am stopped with the A/C running.
×
806 views
Usually answered in minutes!
Thanks. But that is an expensive suggestion. If the compressor bearings were failing, I would expect the vibration to be over a larger RPM range. The sound is more like something is loose and knocking, or like a loud relay chattering, than a rotational bearing problem which I would expect to have a squeaking sound.
×