My 2004 Endeavor is making a strange hissing noise under my car. It comes on when I do over 20 MPH and continues until I drop below 20MPH. I thought it might be the brakes so I changed everything up front, caliper, rotors, and brakes but no help. It's driving me crazy. I don't hear it below 20 MPH. Help

I have this noise too. I thought it sounded a bit like a valve letting off some steam - wondered if it was a coolant leak, but it isn't that.

There has been some talk on here about it being a bearing of some sort, I can't remember exactly.

This noise and my weird grumbling wheel bearing noise that isn't a wheel bearing, and the fact I'm out of warranty = today I have just done a deal to trade to a new Outlander XLS! Got a great deal and was getting the "time bomb" feeling with the Endeavor, so have just gotten rid. Pick up the new Outlander on Saturday - Can't wait!

My Endeavor has been a great vehicle until this last year where it has been hit by multiple problems and expensive service bills. Maybe if I stumped up more cash to fix them, it would go fine again - but for what little payment the one is costing me, it really wasn't worth the risk.

Your noise sounds similar to mine. I had more of a screeching noise coming from my engine. Kinda sounds like a belt. It starts when the car is warmed up and I reached 40 MPH. The pitch of the sound goes higher as I increase speed. It stops screeching when I go below 40 MPH.

I take my Endeavor to GoodYear for service and mentioned the noise. I ended up taking the mechanic for a drive to let him hear for himself. The mechanic said that its thepropeller shaft and there is a service bulletin out. I hope this helps.

I JUST had the same issue -- it turned out to be the bearings on the driveshaft were bad and the driveshaft needed to be replaced. Problem solved.

I have the same problem, I'm going to call my local dealer about the propeller shaft. The dealer had it for 4 days last week and couldn't figure the noise out! They first thought it was the brakes, then a hub bearing, then a caliper. Nada. Hopefully this will be it!

do a search. This has been talked about many times here.

It was the shaft! :clap: I drove it home today and there was no noise. I am doing the happy dance.