CuCruiser
SILVER Star
Maybe this was discussed before but I couldn't find it. Are the HAC valves strictly on or off, or is there a gray area where they are partially open, then gradually opening fully with elevation?
I ordered one to replace the unit missing from my truck. When I got it I sucked on one of the ports to" test" it (an activity more accurately described as idly goofing with a new part), and it gave a loud 'pop' which I hoped was normal, but kinda figured wasn't. I've driven the truck from down around 2500' up to near 7000' and there is always some vacuum at the distributor advance. It runs better without it on a daily basis in the low-mid 3000's, so currently disconnected.
I ordered one to replace the unit missing from my truck. When I got it I sucked on one of the ports to" test" it (an activity more accurately described as idly goofing with a new part), and it gave a loud 'pop' which I hoped was normal, but kinda figured wasn't. I've driven the truck from down around 2500' up to near 7000' and there is always some vacuum at the distributor advance. It runs better without it on a daily basis in the low-mid 3000's, so currently disconnected.