I have an 07 Expedition EB and the front air does not work infrequently, but it only happens when the temp is over 100F (I live in Phx). This issue started last September and stopped when the temp lowered and started again this week. Nothing by way of phone chargers has changed over the past 9 months (when it was happening in September, then didn't happen all winter, and now happening again). Clutch engages, rear air works, just front stops blowing...any ideas or solutions? I have tried all the different settings, and when it won't blow nothing logical seems to get it back moving...and then there are some random times, it will blow.