Climate control system problem
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Climate control system problem
My Excursion has got the manual heating and air conditioning system, and while turning the mode selector control, the air distribution does not shift accordingly. For instance selecting 'MAX A/C' should result in air flow distribution through instrument panel registers, which does not occur. System seems to be stuck in Floor/Defrost-position. However all controls turn freely like they should. Temperature regulation seems to work. Anyone got any ideas what could be wrong?
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Actually I used the 4wd yesterday, and the front wheel hubs def. engaged. Will check tomorrow, as the car is parked at work over night. The leak could have occured after 4wd-ing yesterday?! Thanks
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Crack could've been in the vacuum line(s) and with the air used to engage the hubs, it was probably enough to damage the hose enough, but I could be wrong.
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OK, this afternoon I started the X, and before I did anything else I twisted the climate system mode selector control in different positions while engine kept idling. Same thing as during the whole of yesterday, no actual shifting of airflow. Then I engaged 4wd in an empty and icy part of the parking lot, 4wd and hubs promptly and completely engaged without any probs. Funny thing - suddenly the climate mode control worked, too. Also when disengaging 4wd again. Tried on and off several times and have been driving several errands this evening. Everything functions as normal. Happy? 
Beats me!
Beats me!
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So - two days later: Climate control mode selector starts failing again, and hubs disengage/fail to engage. Shop finds leaky seal atr left front wheel - replaces it and says everything okay. 5 minutes driving, shop now just closed, climate control mode selection fails again, just like before. Mode shifts by engaging 4wd, whit hubs now engaging allright. but climate control mode "slips out" of setting again. Back to shop next day. After several hours of trouble shooting, shop can only identify one possible cause - a defect valve, part# (on box of new) 7C3Z-9H465-A, part# on defect valve >PA66-GF33<. Valve has both electrical and vacuum tube connectors, whole thing little smaller than the size of my fist. Probably located somewhere in the engine compartment considering the contamination of old part. Now - $1600 later, of which seal replacement cost $900 and new valve (part alone) cost $170, we are good. 
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mwells
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Dec 29, 2014 09:13 PM
