Question about Mercedes-Benz 190-Class
Both fans operate when tested but eng. aux. fan won't cut in when o/heating.
Your vehicle should have a viscous fan clutch for controlling the engine temp from overheating. The auxillary fans in front are used when the a/c is on. I would start by spinning the engine fan or viscous fan by hand when the vehicle is off. The fan should show resistance when you spin it. If it doesn't and it just free spins then the viscous fan clutch is bad. Let me know what happens when you spin the engine fan and also exactly how high does the engine temp get. Does it reach the red mark?
Posted on Feb 23, 2012
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Posted on Jan 02, 2017
SOURCE: i have an 03 grand
Based on limited information so far, it sounds on the surface to be the TPS (throttle position sensor). This component controls the idling speed of the car under all conditions (cold, warm, AC turned on). Unfortunately, the component is purely electrical and the only way to repair it is to replace it.
Posted on Jun 20, 2011
Just a shot in the dark, But did you or some one else remove the thermostate?
If so put a new one in this will let the car run fine in the summer but cold weather the car cant get warmed up.
Posted on Nov 28, 2010
I had a similar problem on my 190E 2.3 1992.
I solved it replacing the relay multi use with 5 pin connection. It's cheap and probably will resolve it.
Posted on Jan 23, 2010
i assume u r refering to the cooling fans,,, if this is so the freon is low ,fans come on and lower the high side ,there fore lowering the low side and the low side switch cuts it off and on,,charge it up
Posted on Jun 30, 2009
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