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Recirculate door malfunction Help!!
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Question
M.Richter
I am at a loss I have a 2001 GMC Yukon XL slt with dual heat and AC, I will try to explain this as simple as possible, since I purchased it about a year ago the Fresh/Recirculate Door stays in the Fresh position! I have replaced the Recirculate Actuator the one close to the passenger defrost vent, It has power because when I push on the door through the glove box it fights back! The switches on the heat AC control module work (so it seems) the light switches between the 2 modes as I would expect but the door will not change position! I know there are modes that recirculate is not available! I can get the recirculate light to stay on but the door does not move! Now to explain everything I have done to hopefully fix this and other issues, ( replace orifice tube, Receiver/Drier, Recirc Actuator, vacuum down system, add 5oz of Pag oil plus 5 more (the amount recovered from Drier) added 3 lbs of R134a (what the system called for) I pulled the schematics from a Mitchell manual for the AC wiring but can't make heads or tails of why it has 2 high pressure cutout switches? I did check a repair chart that mentioned one of the high pressure switches causing the recirculate door to malfunction? But causing it to stay in recirculate not fresh, I don't know if I should look at the control module below the radio(could it not be sending the right signal?) I see 3 wires in the schematics for the recirc motor I attached a photo of the schematics I am trying to use to figure out why the actuator won't change modes? Everything else works in the heat AC system (hot/cold) (vent switching) the rear system works great! Sorry if it was confusing I am at my wit's end with this up to today every one tells me it the actuator they don't seem to hear that I ripped the dash cover off and made my hands and arms bend in ways they should not to replace the actuator motor! I just need to find someone who knows how this actuator is wired and how to eliminate things without replacing good parts till it works again I have several volt/ohm meters and a 5mm bore scope to get into tight places I just need to know were to start and what to look for?
Thanks I am loosing sleep over this.
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