ccssupra Posted July 16, 2014 Share Posted July 16, 2014 If I have the fan temp at say 20, then it will be fine, if I change it to 25, I got full on hot air coming through like its on the hottest setting. I have changed the heater controls themselves to no avail. Also, when aircon is on, it comes and goes, you can hear the engine change note when you feel ice cold air coming through, then it will return back to "normal idle" (like aircon is off) even when the aircon button is still lit, and only normal cold air comes through.. What can be the cause of this? Quote Link to comment Share on other sites More sharing options...
ccssupra Posted July 19, 2014 Author Share Posted July 19, 2014 bump! Quote Link to comment Share on other sites More sharing options...
Scooter Posted July 19, 2014 Share Posted July 19, 2014 I'd check the rod/arm mechanism and how it moves when you move the temperature dial. You need to lie on your back in the passenger side footwell to look up and see it. Quote Link to comment Share on other sites More sharing options...
JayJay1374 Posted July 24, 2014 Share Posted July 24, 2014 Scooter please empty your inbox! Did you get the heaters sorted mate? Quote Link to comment Share on other sites More sharing options...
Guest Roger NE Posted July 25, 2014 Share Posted July 25, 2014 (edited) I'm not familiar with the Mk4 heater panel . . . but I imagine it will work in a similar way to the Mk3 system On these, the control panel develops dry joints - you need to remove it and re-solder EVERY point on the circuit board (especially all the pins that go from one side of the board to the other). But you need to be very thorough - I'm an electronics engineer, and the first time I did mine I hadn't done every pin - had to do it again before it was fixed. The other thing that's worth doing is using proper Electronic Switch Cleaner/Lubricant in the temperature dial, in case that has any residue causing intermittent connections. Mk3s exhibit exactly the symptoms you describe . . . re-soldering the board properly always fixes it. Edited July 25, 2014 by Roger NE (see edit history) Quote Link to comment Share on other sites More sharing options...
wile e coyote Posted July 28, 2014 Share Posted July 28, 2014 here you go slam Quote Link to comment Share on other sites More sharing options...
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