scoobiedubie Posted August 14, 2016 Share Posted August 14, 2016 (edited) My heater fan quit functioning simultaneously with my A/C compressor, when I turned the engine off. Now, neither will turn on again. In the past, the heater fan occasionally stopped working, but then it eventually comes back. I have check the fuses and fusible links. I have changed out the heater fan switch, the interior heater fan itself, and the pulser amplifier. There is suction in my dash mounted control unit with 5 buttons. From the manuals, my remaining options are "the mode actuator", "the mode control unit" and the "A/C max unit", non of which do I know where to find or what they look like. Does anybody have any previous experience in solving this issue, and could you please point out where I might find the most likely culprit that is screwing up my ventilation system. Edited August 14, 2016 by scoobiedubie 1 Quote Link to comment Share on other sites More sharing options...
two85s Posted August 14, 2016 Share Posted August 14, 2016 ...me too. My fan doesn't turn on period at any speed. Quote Link to comment Share on other sites More sharing options...
jsyme Posted August 14, 2016 Share Posted August 14, 2016 I've got a 1989 GL 5-speed dual manual trans w/ 230,000 miles. The car is new to me and it's got the same symptoms: no AC click engaging the clutch, no interior fan speed 1,2,3,4. nothing. no bad fuses. no heat or cool. 1 Quote Link to comment Share on other sites More sharing options...
scoobiedubie Posted August 17, 2016 Author Share Posted August 17, 2016 With all the experts on this board, who have never been stumped, I just cannot believe that not one of them knows the answer to this question. Quote Link to comment Share on other sites More sharing options...
TomRhere Posted August 17, 2016 Share Posted August 17, 2016 Haven't seen any of the "Guru's" on here in a while. I believe, that the mode control unit and mode actuator are the complete push-button assembly on the dash. It's two units, screwed together. Had issue with my '88 where it wouldn't change modes unless I left the control unit loose in the dash. Found the vacuum part of the control to be broken in a few places. Swapped in another control, all is good. No ideas on why your blower fan doesn't work. Not real knowledgeable on EA82 systems. Quote Link to comment Share on other sites More sharing options...
DaveT Posted August 17, 2016 Share Posted August 17, 2016 Get a scan of the fsm schematics. Troubleshoot the heater fan with that and a voltmeter / test light. I never had a GL10 so no easy guesses for me. Also have not had many heater fan or ac problems, other than the lowest speed failinf, or a freon leak. Quote Link to comment Share on other sites More sharing options...
rdweninger Posted August 17, 2016 Share Posted August 17, 2016 On the heater blower motor, try hooking it directly up to 12v to see if the motor actually works. Also, if I recall correctly, I believe there is an inline fuse before the blower motor (somewhere up-under the passenger floor). I have had several resistor packs go bad... but they always seem to work on High (4) ie., no resistance. However, I'm sure it is possible for the entire pack to go bad. Sorry, no help on AC... I don't have it, and thankfully, don't need it on the breezy coast. Quote Link to comment Share on other sites More sharing options...
scoobiedubie Posted August 26, 2016 Author Share Posted August 26, 2016 (edited) See "heater blower circuit" thread. It looks like the problem is a relay under the dash. Mine is now back running for the 95 degree weather, thank you very much. Edited August 27, 2016 by scoobiedubie Quote Link to comment Share on other sites More sharing options...
Loyale 2.7 Turbo Posted August 26, 2016 Share Posted August 26, 2016 If everything A/C related, fails at the same time and you are Sure that the system is completely Charged; then check the Relays, they usually fail after more than fifteen years. Here's all the info regarding the EA82 Relays that you might need, it cover the A/C ones: ~► http://www.ultimatesubaru.org/forum/topic/87523-how-to-swap-the-old-roundie-relays-with-standard-bosch-relays/ Kind Regards. Quote Link to comment Share on other sites More sharing options...
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