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My 02 V-10 Ex seems to be blowing Air from the front vents up to the Defrost unless it go through a series of events-- Hit Auto then forward Air then the fan has to be a 4 only. It will blow forward vents then go back and forth from theirr to the defrost. Also the Temp seems to be much hotter then it should.
Took a interstate trip this weekend though and it seems to blow much colder and do a little bit better staying in the front vents however still goes back and forth. Im in FL and its HOT!!!! The only thing I know is that its a vacuum system.. and that again its HOT in the truck as a daily driver. Please Help with the next direction to go!
First step should be to inspect the vacuum lines going to your hubs. These vac lines can break leading to vacuum leaks.
IF the AC doesn't feel cold you that could be 1. you need a recharge of R134a or your fan clutch is getting weak. The latter is true especially if it gets warmer in town than on the highway.