2001 Honda Civic Q&A
2001 Honda Civic Question: AC cycles 1x then drops off at highway speed. Under 45 MPH works great.
Civic EX /5-stick /177K mi. Q: At Hwy speeds the AC cycles 1x then drops off & blows hot & moist. Under 45 MPH works great (inc stationary). Honda mech's have replicated the problem but can't determine the cause. So far the thermal protector has been replaced, & overall system checked out, but problem persists. The car has been properly maintained, everything else works great, no codes. ...car back w/Honda dealer, 1wk and counting... - xclibr96
Check the Throttle Position Sensor. This may sound wacky but hear me out, the A/C is designed to cut off at about 1/2 to full throttle, so if the Throttle Position Sensor has a worn spot, at steady cruise speeds it can go 'open' which makes the engine think that the driver wants full throttle, then the A/C system is shut off, to give more power. I have seen this before on other types of cars. - dandd