Lumbar pump
 

Doing a search, all I seem to find is repair it with a rubber glove. Don't know if the diaphram is torn or not, but all the pump does is go "thunk-thunk". I would think if the diaphram were torn it would run but not pump. Mine doesn't seem to even run.

Thanks for any help. Steve

Re: Lumbar pump
 

Correct, the pumps with the bad diaphragm will run but not build any pressure.

The 94+ seats used a different style pump from the 90-93, just so you know. Not sure what year your car is.

I'd suggest pulling the lower seat cushion, to see if you've got voltage at the connector for the pump when you hit the switch. If so, then perhaps the motor of the pump is bad.

Re: Lumbar pump
 

Thanks Vettemed, the car is a 1990. I should have mentioned that, I saw looking through posts that they were different. No easy place to check voltage, but it pulls about 2 amps when I hit the switch and goes thunk.

Re: Lumbar pump
 

can't you disconnect the harness where it plugs into the pump and measure voltage at the connector terminals?

If it's the pump going "thunk" and not a relay, then it sounds like a bad motor to me.

Re: Lumbar pump
 

And just where might I find a new motor these days?

Re: Lumbar pump
 

probably not gonna find new, used will be your best bet I suspect.

Re: Lumbar pump
 

I cut a diaphram from a thin bicycle tube (not the thorn proof ) The pump now works and was very easy to accomplish. To the point that even if I did need a new 20 year old used motor, I would change out the diaphram first anyway.

George

Re: Lumbar pump
 

If you haven't opened the motor up, I would suggest doing that before looking for a new one. When I fixed mine, the diaphram was hung up inside. I had to free the motor thingee from it and then the motor worked. maybe your motor has encountered the same problem.

Re: Lumbar pump
 

I was going to post the same.

I know I had a few pumps at one time, I am not sure I have any extras, but I bet the piece the connects the pump to the diaphragm is stuck

Re: Lumbar pump
 

As has been mentioned several times. These are very fixable. On a scale of difficulty from 1 - 10 I'd put this as a 2.
A "1" would be changing you oil.

I too used thin inner tube to fix mine in 99. Hasn't failed again since. Others have used kitchen/bathroom cleaning gloves.