I did some research for an expansion value on the net and the most expensive price I got was $60.
Is the technician correct with this price quote?
(also my a/c was converted to the latest a/c, if that helps any)
The roughly $300 quote is reasonable if it includes about three hours of labor to recover refrigerant, flush the system, replace the expansion valve, and recharge. The part itself may cost around $60. A mechanically skilled owner can lower the bill by replacing the valve and flushing the system after a shop recovers and later recharges the refrigerant.
The owner of a 1992 Toyota Celica with a converted A/C system was quoted more than $300 for an expansion valve, while online parts cost about $60. The expert explained that book time is about three hours for recovery, flushing, replacement, and recharge, so labor plus the part can approach $300. Doing the mechanical work personally after a shop handles refrigerant recovery and recharge could reduce the cost, but requires mechanical skill.