230te overheating in traffic/carrot test extras

TonyJones

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2003 S55 L AMG kompressor
Hi

I've had a '92 230te auto non aircon for about a month now and noticed the temp gauge, which normally sits around the 80 creep up when i'm stuck in traffic to 100+ and then return to the normal 80 once on the move again. The fan is just running very slowly at this this raised temp.

Have seen the carrot test mentioned here but it seemd pointless as it wouldn't chop soft butter let alone a carrot :D

I needed the aboved fixed urgently as I was going to use the car to do a 450mile round trip tomorrow so booked it into a merc specialist for the fan coupling replacement. They have subsequently told me its not the viscous coupling but a faulty switch/solenoid causing the problem ie if bypassed fan works perfectly.

So if anyone else has such problems its worth checking the above too. I have no idea where said switch/solenoid is (near thermostat ?) but will check when i pick the car up on Saturday (no part avail til tomorrow)

I now will be making the journey in a 1.2clio (uni visit to Durham) which wont be fun :( albeit cheaper on fuel :D
 

rpe2

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His: 2018 E220 d; Hers: 2016 SMAX
Hi Tony,

The sensor is on the top of the engine next to the thermostat housing. If you were to follow the wires, it would lead you to the back of the water pump.
 

television

Always remembered RIP
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2002 SL500, 216 CL500, all fully loaded
Yes as rpe2 smack on top of the engine at the front,,well known for failing after all of these years
 
OP
T

TonyJones

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Thanks rpe2/television , can visualise it now
 

Alex Crow

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W169, W124, w202, W203, KTM 250 EXC, VW T25 camper and a Polo in a pear tree
expect the temp to reach 105deg.

!!!!!!!!!!!!!!!! these switches do not engage the fan until over 100deg !!!!!!!!!!!!!!!!!!!!

as long as the temp does what you say it sounds fine, if a little scary - maybe put some tape over the gague?
 


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