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Originally Posted by PalmSpringsE534.6
Pulled and replaced the fan. Still no operation. Pulled the AC pressure switch to make the aux fan run...no go. Checked power from fuse 61 to the fan plug...that's ok. Ground wire is good. Waiting to have a shop put a scope on the signal wire to see what's going on. Hoping it's just a bad signal wire and not a DME/ECU issue...but I can send the DME and EWS out for service if need be. I'll update once the shop looks at it. Took the opportunity to also change the radiator output temp sensor so there is that. Also ordered a new air tube for between my air hood and the air cleaner/resinator. It had a crack I hadn't noticed. Also cleaned up and detailed the engine compartment again.  |
About two years ago somebody had a non operating aux fan. Fan worked ok just never got the signal to turn on.
He made solution that ran the fan based on radiator in/out temp. I'm not sure how/why the AC worked but rather than replace/rebuild the DME it was a solid workaround.