C180 elegance 1999, aircon temperature problems

[peter longstreeth]

I would be greatful for any suggestions for this heater fault on my wifes car.Aircon not cold enough

March 1999 - C180 elegance manual heater control,

With the aircon on, the Temperature dosn't run cold enough like it used to, it seems to be an intermittent fault.

It has been re gassed but the symptom still remains.

When both the heaters are set to lowest temperature settings I have noticed that both the heater solenoid valves pulse, say every 2 seconds and can feel warm water passing through them, if i disconnect & reconnect the wiring plug to the solenoids the heater will go to maximum heat & then once cooled down the pulsing stops and will run very cold until the pulsing returns to the solenoids after a few minuets.

I was wondering if it could be the inlet air temperature sensor playing up, any suggestions please as to get to this i think is a real pig of a job, steering coloum and the dashboard has to come out, or am i wrong, many thanks for any suggestions peter

 

[type49]

I was wondering if it could be the inlet air temperature sensor playing up, any suggestions please as to get to this i think is a real pig of a job, steering coloum and the dashboard has to come out, or am i wrong, many thanks for any suggestions peter

You only remove the dash to replace the evapourator. If the evapourator needs to be changed, it will be because it is leaking gas & no other likely reason. The air temp sensor is in the bumper. There may be fault codes or other info that can be read out via diagnostics , eg outside air temp sensor, interior air temp sensor, gas pressure sensor, gas temp sensor, evapourator temp sensor, compressor clutch etc etc. Get it looked at by someone who knows what they're doing. Try "Reader Air" in Woking, Surrey, just round the corner from you.