2004 Corolla A/C problem

[Riche]

After searching for a little while I believe there are not many Toyota’s with a/c problems. I am trying to help a friend out with his wife’s 2004 corolla. The a/c is not cooling everything seems fine. The a/c switch inside engages the cooling fan. The motor rpms rise. But the compressor does not kick on. Plenty of 134a in the lines, a test of the 12v lead to the clutch shows no 12v. The a/c fuse is good… Is there a relay? If I put 12v to the clutch it engages and cools… I suspect the switch on the line is bad. Anyone know how to test the high pressure line switch? It has 4 wires????
What is the next step back from the compressor to test? I would appreciate any help you guys can give; I think we are going to try to work on it again this weekend… If anyone can help please do my buddies wife is pregnant with no a/c!!! I am sure he will get an ear full every night when she comes home till it is fixed!!!!
B.T.W. For you guys up north, yes we need a/c this time of the year in south Louisiana!!!!

[Riche]

The relay was bad it was labled mc, mac or something like that. It is in the pannel under the hood on the drivers side.

[bpodskalny]

there is a tsb for this issue, it will be covered under 3yr,36k warranty if its still applicable.

every car from i think 2000 on has this crap relays. we cant keep em in stock. should be a recall imo.