Call Eurasian. Earlier models used one valve pre 88 and new models used two valves post 88. These valves are also used in mercedes. I currently driving a E32 735i and when I turn on the a/c. It blows out hot air first and then turns to cold. But sometimes when I turn the a.c on turns hot air and then the right side turns cold after like 5 seconds, but the left sometimes won't and stay on blowing hot air for the rest of the trip. Anyone have the same problem? Is this problem caused by the heat valves? Thanks??