Aux Heater Temp Sensor

[Masked Marauder]

No, I have checked all the wiring digrams.

[Jeff115]

I don't understand what you are on about Jeff?

 

If the switch does as you say and stops the air-con working if the switch is closed (below 4 or 10 degrees) then having the fuse in the connector would disable the air-con.

 

Sorry for delay, am home alone minding young 'uns for couple of days :lol:

 

Yes, MM, if we agree that the ambient temperature sensor in the plenum chamber just closes to allow full current to pass through when temperature is less than 10 degrees then I agree and I cannot see how this simple switch could protect the a/c by stopping the operation/engagement of the a/c clutch at temperatures < 1 degree.

 

I can see how it works for the heater i.e. closes the circuit from alternator to booster heater (or clock switch to additional heater), on diesel engined models, when temperature less that 10 degrees to fire the heater and provides supplementary heating to coolant.

 

However the Seat / VW workshop manual does depict and describe that this ambient temperature sensor does switch off the a/c magnetic coupling at low ambient temperatures (off @ -1 degrees and on at +7 degrees) in the case of a/c systems with manual controls from 06-2000.

 

I wonder could this work in a similar way to disengaging the a/c coupling when you floor the accelerator? Is this done using the ECU?

 

For a/c systems with manual controls to 05-2000 the ambient temperature switch is shown under and to RHS of the thermo switch (mid-engine chamber) but with same described functionality as above.

For a/c systems with Climatronic to 05-2000 the same switch is depicted as Manual and to 05-2000 but function is described as