Well I have an intermittant A/C problem on my 1993 4Runner SR5 with 6cyc, automatic 2x2. (133K)

A/C is charged with R134 by the dealer about 12 months ago. Sometimes its cold, sometmes just the fan blows. Yesterday it was out all day. Today it worked fine.

Dealer said it may be the "H-Valve" deep under the dash. I looked t at the manual and do not see an H-Valve anywhere.

Any ideas on what to do first?

 

http://personal.utulsa.edu/~nathan-b...ditioning.html

 

Thanks, I have that link. Cant find anything that lists an H-Valve only a heater relay.

 

It's the expansion valve. I've never heard of the "h-valve."

On the link above, check out the evaporator section. The expansion valve is attached.

 

I've had a leaf get into my AC vents far into the dash (no idea how), and cause the system to only blow hot air. After a while, the rotten leaf pieces blew out into the cab and the air was as cold as before. It may be pieces of the same leaf. Very weird, but it resolved itself both times.