mercedes 190e cooling fan,

[rick 1]

hi,i own(and love) a 92 mercedes 190e 2.0iauto,the thing is the cooling fan refuses to cut in,causing the engine to run hot.i replaced the cooling fan sensor in the cylinder head to no avail,yet when i joined the two wires that run to the sensor together the fan runs constantly.does any one have any ideas?cos im miffed.also the engine runs lumpy(misfires,revs its self up)whether its hot or cold.ive heard from a fellow 190 owner it could be the emitions sensor,could this be right??? any info,advise,would be gratefully received.thanks rick 1.

 

[Stevie A]

Could new temp sensor be faulty? Can be tested in water with a battery and bulb. Or maybe there is no water / coolant at sensor area caused by airlock / low coolant, so it is not switching in order to tell fan to work.

If air lock - Remove coolant resevoir top up lid and give top rubber hose next to head a good squash with hand until air bubbles stop coming out.

 

[television]

As Stevie A says, got to be the sender faulty and a good way to test it.

malcolm

 

[rick 1]

Could new temp sensor be faulty? Can be tested in water with a battery and bulb. Or maybe there is no water / coolant at sensor area caused by airlock / low coolant, so it is not switching in order to tell fan to work.

If air lock - Remove coolant resevoir top up lid and give top rubber hose next to head a good squash with hand until air bubbles stop coming out.

thankyou,ill try that.

 

[rick 1]

cheers for the help,this sites great.thanx.