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Hi, my Merc is a 92 300CE-24 with the M104.980 engine. One of the haunting problems is the high idle and would like to seek your advice. Three years ago (2019), the idle all of sudden stuck at 1500 rpm. My mechanic tried adjusting the duty cycle without success. It turned out the air...

I notice that the rev keeps bouncing almost every minute after I turn the a/c on. Usually, the 1st 6 to 7 minutes are fine, then the rev goes down and bounces back every 40s to 1 minute. Look like the a/c is on and off. Just wonder if it is normal. I recorded a video and it is here. In...

Hi, I've just bought a 92 300CE-24. Once the engine is started, I hear "hee-hee" from the central console. It turns out coming from the air flow speed switch - the left dial in the following picture: I get it out As you can see there are 2 nozzles that connect to 1 vacuum tube in...