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I'm at the point of changing the o-rings out of the heater core, I can see the 2 servo's right above it. Should I drill a couple holes in it and give her a good blast of oil or grease?
 

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Oil or grease could collect dust and jam up the motors and flaps, i could be wrong, maybe someone else has tried this, i sometimes spray WD40 into the air box to free up a sticking distrubution motor that sticks sometimes bringing up the book symbol, i done thid by removing the center vents in the dash and drilled a small hole in the heater box
 
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