My wifes Expy has a strange noise. When you have the truck real quiet (no stereo, A/C off, etc.), when you come to a stop, I hear what sounds like a "motor" running for about 5 seconds, then it stops.

It sounds like the my old LLS pump running, almost exact (but quieter), except, now that I disabled the LLS system it cannot be the LLS pump.

It sounds like it is coming from the passenger kick-well, by the heater box. It is a "gurgling" motor sound, and like I said, It cycles for approx. 5 seconds....then stops for about 20 seconds...then runs...etc.

Anyone know what it could be?

 

I sometimes hear a gurgling noise like the one you describe when I have my rear heat on and the truck running, and then either shut the heat off, or come to a stop and shut the truck off. Kind of by the passenger kick well/center console area is where it seems to come from on my truck. It doesn't cycle on my truck, though.

I kind of guessed that it was either air being pushed through the system, or pressure being purged once the system was off.

 

Could be that, but it is definatly an electric motor of some type.

 

It is probably the self leveling pump.

Milkman