June 2, 200718 yr I'm having a hard time troubleshooting this one. The fan for the A/C, heater, etc went totally dead. The fuses for the fan and heater are all good. I checked for power at the motor and didn't get any. I pulled the dash cover and put the multimeter on the harness to the switch and can't detect any power to any of the five leads on there. Is there something that would kill power to the switch but not kill the fuse? All four fan positions worked prior to the sudden death. Any tips for troubleshooting this one? It's getting hot and my A/C is actually functional if I can just get the air to move.
June 2, 200718 yr The power for the blower runs through a relay under the dash. It sounds like the relay is causing the problem. You may be able to locate it by tapping on the relays. It might make the blower work. One thing to note about the circuit is the switch and the speed resistors are on the ground side of the motor load.
June 2, 200718 yr Author Thanks for the tip, Cougar. Where exactly are the relays located? Left side? Right side? Do you happen to remember which panels need to be removed to access them? Thanks!
June 2, 200718 yr I'm not positive on the 86 but on the 87's it is located above the ECU -> which is above the drivers left knee when seated. That is the panel you must remove, take down the ECU to make room. Way up in there amoungst the wire jungle it will share the location with other relays snapped in to a row. They all are the same and all look like this Hope this helps.
June 6, 200718 yr Author Thanks Skip and Gloyale! Thanks to you two, the relay was easy to locate. It was obviously bad when I pulled the plug and saw the scorched lead. I went up the road to Meridian Auto Wrecking in Graham and found a replacement. They didn't even charge me for it! I plugged it right in and it worked immediately. By the way if anyone is doing this in the future, you don't have to pull the ECU, just the fuse box to access this relay. Another USMB save!
June 6, 200718 yr Good photo Singlecoil. You can see how the heat from the bad contact connection in the relay transfered from the relay connections to the connector.
June 6, 200718 yr Thanks Skip and Gloyale! By the way if anyone is doing this in the future, you don't have to pull the ECU, just the fuse box to access this relay. Another USMB save! You're welcome. Knowing that it's fixed is great, thanks for updateing and great pics. The warm feeling of being connected to working cars driving happy people is the reward for taht makes up for the countless 's from the GF. I may have to quit this or she'll be
June 6, 200718 yr could you please post this pic into skip's repair thread? http://www.ultimatesubaru.org/forum/showthread.php?t=75738 It would be invaluable, but since its your photograph I hesitate to post a link to it myself.
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