I have been experiencing troubles with my 1996 Celica air conditioning. Replaced my compressor, receiver, evaporator, compressor speed sensor, and eventually the shop said it was a bad amplifier. The dealer said that part is obsolete and cannot be ordered. The shop went to a pick and pull and got the A/C working, $690 later! When I picked it up still no cold air! Any suggestions, short of re-wiring A/C to a toggle switch?