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I had an issue last year with the same thing. I cant remeber the specific code, but the A/C would work, then stop blowing cold. I replaced the switch on the lines with a new switch. I bought a Ford OEM part BT4Z-19D594-A and replaced the switch. I have been blowing cold air ever since and have...

Has anyone else had any issues with the knock sensors retarding timing at higher RPMs? I found out from Lund Racing after data logging for a tune that the knock sensors were active at higher RPMs. I have used gas from 3 or 4 different gas stations and checked the compression of the cylinders...