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[quote="gritsop"]Hi,

Well ... problem with the thermostat solved. The defective elements were on the thermostat and specifically the IC (LM2903 - voltage comparator) was burned out and one of the two Zener diodes was also blown. Replacing one element at a time did not make any difference until both elements were replaced.

[img]http://img518.imageshack.us/img518/4372/copyofhpim6533fw0ma6.jpg[/img]

Now the A/C switch reacts like a variable resistor and it can actually trigger the compressor clutch depending on the position of the switch. Both condenser fans operate and the compressor clutch cycles on and off respectively. Ice does not form any more on the low pressure hoses and I now have a fully working A/C unit. :D

Moreover there was a drop of the performance of the A/C since the first freon charge. The problem was found at the discharge port of the compressor. The charging needle (like the needles of the tyres) was bent and freon was leaking out ... one could actually hear the hisssss by placing his ear close to the port. It was a five minute job for the A/C shop to vaccum freon and replace the needle with a new one. I also had the pipes and unions checked for leaks by the A/C shop and no single leak was found  8)

Looks like the A/C project is over at last  :wink: and I am waiting for the hot days to arrive in order to check the performance.

Special thanks to Dr.A and Ken for their input

Regards,[/quote]

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