Subject: DIAMANTE/ELECTRICAL
Question:

1994 DIAMANTE 3.0 DUAL OVERHEAD, AUTOMATIC
HEAT WAS KICKING ON WHETHER SWITCH WAS ON OFF OR ON POSITION WHENEVER I HIT A BUMP. I HAD THE SWITCH CHANGED, DIDN'T ELIMINATE PROBLEM, THE COMPRESSOR ALSO KICKS ON, THEY SEEM TO TAKE TURNS DOING THIS. WHAT SHOULD I BE LOOKING TO FIX, CHANGE?

THANKS! 
Answer: Essie,
Because the Diamantes uses push-button heat/AC controls instead of dials like many other cars, the buttons can wear there spring locks and cause the different accessories to automatically engage when you hit large bumps.

There may be a series of switches that need to be changed. You may even need your accessories electrical harness replaced. Sometime the harnesses can become loose and cause such problems. Also, you have relays that are controlled by the switches inside your car. A relay is just a heavy duty mecahanical on/off switch. Like all mechanical devices, they can wear down. These relays should be located in your fuse box, under your hood. There's no visible way to check to see if they are in good working order, but they are easily replaceable. You may just need to replace both your heater relay and A/C compressor relay.
Good luck!