nozzano22

Group,

I read the great post by Tony on the regulator replacement and pulled out the blower tonight. I suspect my problem lies with the regulator but wanted to check if my troubleshooting is correct.

Last week my AC started blowing warm, but with the same force as always. A quick $100 trip to a local shop and a recharge and it blows cold again, but now does not blow on high (some changes with the lower settings, but no high speed function). As I had all the parts out I carefully turned on the unit again and the fan had a slight squeal and spun up, but then started to slow down to a stop.

I am not sure if this is a typical symptom of the regulator or blower motor, any thoughts? I also read the post about the diagnostics available via the AC controls, is this the proper way to test for this problem? I put a volt meter on the leads going to the blower and got a 12V reading regardless of what level was selected on the AC controls.

My car is a '98 e300 with 237,000 miles so it has seen its fair share of use,

Thanks in advance,

Mike

iluvJesus

jump the motor itself with 12V, if it blow as strong as your usual high speed flow, change the regulator. But do not buy the unit make in China from ebay.

nozzano22

Thanks for the quick reply, I will jump it with 12V and go from there!

Mike

TMAllison

Being a 98 I doubt you can get the reg only; typically prior to 99 you'll have to buy the ~$800 blower motor, heat sink, and reg retrofit part.

You can use a reg from equalivent year W140; you'll have to cut and spice your harness to it. Search should pull up the part numbers.