1991 Loyale. The push button cassette on the dashboard is not powering up blower fan or engaging a/c compressor clutch. Two 15 amp fuses are good. Fusible links under the hood are good. Fan speed switch set on high shows about 1 ohm reading from blk to blu wires, so fan speed switch is not the problem. I really want to avoid opening a can of worms by getting into the cassette push button electric contacts assembly to look at any problems in there, unless I am forced to do that. The symptoms were intermittent then nothing. Is there a relay switch for the air controls?  Thanks

Edited August 31, 20196 yr by rickyhils

yes, relay is under dash to left of steering column, in a bracket that holds 4 relays.

It will be the one with a big fat Green/white wire in it.  Not sure but I think it's a Blue connector.

The pushbutton cassette only has 2 sets of contacts.  

1 that closes at any position other than "off" that activates the power to the fan.

the other set is for the A/C "on"

All the other switching of blend doors and such is done with vacuum, not electronics.

The dropping resistor that controls fan speed is in the air duct above passenger feet.  That resistor controls the GROUND side of the fan wires.