MX5Bob

In trying to figure out the electrical issue with the air conditioning on my '93 Pickup [3-liter V-6, 2wd] I decided to try replacing the relay that's mounted in the passenger foot well next to the glove box. In exploring RockAuto's listings there's one for the blower relay, which is the square one with black plastic case, and one for an A/C compressor relay, which has a round, metal case.

Anybody know where that second relay is located? The wiring diagram from the FSM doesn't include another one, so it makes me wonder if it's the cut-off relay for the 4wd model.