Quote:
Originally Posted by Johnny_5
How loud are these pumps supposed to be? Reason I ask is that I can barely hear it. Even when I have the rear lid open and listening I can hear it but its pretty faint. Does that mean its going bad?
Is it common for these pumps to get that hot? I thought these had heat sensors so they turn off if they get to a certain temp? Have you maybe considered soldering on a new set of wires or building a new set from scratch? Color will be off but as long as you color code the wire I dont see that being a problem.
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The 4.4 is the only one I could hear out of 3 E53's I have owned with air suspension. Since I could hear it, I sorta assumed it was on the way out. Though that was in 2019, it was less than 25k miles ago. Production dates could be a difference. The 4.4 is a small sunroof unicorn (the 2nd of these I have owned) with an early production date 10/03, IIRC. It could be that early units of the LCI were louder than the newer ones. The 4.8 is a July '04 production.
I dunno ab the heat.
Some of the used units I saw on eBay also had a little frey in the insulation there so maybe it is more common than we hear. I found a used four corner unit with good wires for $160. If I can get a functional Wabco rebuilt for $200, I am in.
Your question does have me looking for some heat sync fins I could glue on there or use double sided thermo tape. They're all over the place for PC builders. I always figured I would have to add them to my Android radio when it got too hot, but it never has messed up due to heat. OTOH, if this is something that fails every 6-7 years, I may not cross this road again in the 4.8.
