Expansion valve on 1990 Honda Accord

a Honda mechanic friend said i needed an expansion valve for the AC. Where is it located on this model? My car is cool initially then the AC goes from somewhat cold to warm when I stop at red lights. Once the air blows warm it stays warm until I shut the car off for a while. There is no overheating, no coolant leaks, plenty of 'freon'. So i know it's an A/C problem. Does the expansion valve typically cause this? Car has 280,000 miles.

Asked by for the 1990 Honda Accord
The expansion valve is located behind the dash in the evaporator housing. It could be causing the problem you describe. To replace it requires evacuating the refrigerant and recharging the air conditioning system after the valve has ben replaced.
Thank you! We may give it a go today.
3 answers 1 comment
1990 HONDA ACCORD EXPANSIN VALVE : WHERE IS IT LOCATED
I WILL TAKE A " GUESS "!! YES IT MAKES SINCE THAT (1). A BAD OR CLOGGED EXPANSION-VALVE WOULD CAUSE THE SYMPTOMS YOU DISCRIBED ; BLOWING COLD FOR A 'LITTLE' WHILE ,THEN BLOWING 'HOT' AND THEN NOT COOLING AGAIN UNTIL THE CAR IS RESTARTED. IT SOUNDS AS IF THERE IS A RISTRICTION IN THE LINE,AFTER ALL THE COMPRESSOR WORKS FOR A LITTLE WHILE AT LEAST, AND FREON LEVEL IS OK.