Diagnosing a HVAC vacuum issue on a Ford F53
The AC/heat is switching to the defroster under higher RPM conditions on my 2006 F53 chassis Damon. It actually seems to be doing it now under low throttle steady state conditions as well. Obviously...
Forum Discussion
JaxDad wrote:
Glad you found the actual problem instead of just throwing silly wasted parts at it.
So much for the “ONLY” solution........
The main reason I won’t go to the stealerships is for exactly that reason, there’s no THINKING about the problem and finding the solution, it’s just throwing parts at it because a book or computer said to do that.
Thankfully the only place where such foolishness does NOT exist is in aviation, which given the price of parts is a VERY good thing.
According to the description the OP made, Heavy acceleration, The problem was the vacuum was used up, which IS a common problem on Ford Chassis vacuum supply. The difference is YOU don't trust dealerships, that is fine. But you come to me and then you pay me $150 an hour to find a supposed vacuum leak, then I find some leak and fix it $300 later. Then you come back and tell me the problem still happens on full acceleration, you then pay me MORE. So, a customer comes to me and based on MY EXPERIANCE, I charge him $150 install plus the $75 for the Vacuum pump and at $225, he is fixed EVEN IF HE HAS A SMALL VACUUM LEAK. The 12 volt pump will overcome any supposed vacuum leak. Lets wait and see if the OP's problem is fixed on heavy acceleration. Doug
