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Can anyone tell me why I don't have vacuum at the cabin temperature sensor on 93 Mercedes 300E 2.8 the sensor is located close to the sunroof and the 2 wires are hooked up correctly when I put my hand on the hose it doesn't have any suction.where is the source of the vacuum coming from so I can trace it back to the beginning.Thanx in advance

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Am not sure.but i gess in the means the membraan,
is leaking air out.see on your pc for the program,
wheeler&dealers.he has made a program how to do this.

Posted on Oct 18, 2013

Testimonial: "Thanx for trying ro help me with your answer but the climate cabin temperature sensor sniffs the air fro thedome light area and its for the purpose of sending a signal to the climate comtrol for the air conditioning the sensor has aprobe with resistor and a place for the vacuum hose theres nothing in the trunk it should be located under the hood or the climate comtrol unit but I want to be sure before I start taking things apart there was another posting suggesting it was a coolant sensor that is totally wrong the there are 2 coolant temperature sensors on the Nercedes 300E 2.8 and the blue one is located at the water outlet on front of the engine and its the blue one its on the same location as the thermostat housing the other one is at the water pump and theyre not the same as an air ambient inside the car at the dome light on the left side there is asmall window where the sensor is hooked up and its design to sample the inside of the cabin air to send the correct continuous info to the climate control unit providing the vacuum suction is working properly otherwise its totally useless and the compressor will not turn on not even by jumpimg the wires 5 and 7 at the relay swith cluster.Tahnx anyway for trying"

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