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Can anyone help me identify this mystery part? It is a small a/c control module mounted on the back corner of my rheostat dial on the a/c control. It's a small black plastic box with a circuit board inside. The only writing on it is on the plastic case which reads "Plessey for Autoclima".

My car is a 1989 GT-5 with the Maserati heater a/c controls.

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  • heater_ac_switch_control_module
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Good thing there's nothing like that on my old Pantera! Razzer

Seriously, if you can't locate a replacement, the circuit board doesn't look so complicated that any television or radio repair shop can't rebuild it for you. Worth a try, before going to a Maserati dealer or if Mr. Roland has one.

Josh
Peter
Just by looking at the board I would say that the polarity has been changed,
thus causing the diodes to fry, as they are designed to pass voltage and current one way!
All the components on the board are very readily available.
You can very easily test the relay and the resistors.
As far as the IC goes it looks like a texas instrument type TL331CP.
Also the transistor can also be tested and replaced, it shouldn't cost much at all.
I would change most of the components.
Dennis Smiler
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