Hi all, The Maverick has been running good for some days now, (I have actually got to drive it the last two weeks without actually working on it) but, I have another problem, I think I know what is causing it, but, I can't remember how to fix it. Here goes: When the HVAC controls are on any position but "defrost" the blend air door goes to the defrost position when I step on the accelerator to pass, etc. It generally occurs on wide open throttle and when I let off the accelerator the blend air door goes back to its intended position. I know that there is a dashpot, one way air valve, etc. that isn't holding, possibly. Any ideas? Thanks, Craig.