hi everyone and Merry Christmas.
i have posted this problem on another forum and we have not come up with a solution so see how you all see it.
i have an NF Fairlane 6cyl on gas. i had a problem start about 2 months ago when as i was driving a bit hard or going up hill or reving the car the temp would slowly rise until the temp got to 3/4 on the gauge( the R on NORMAL) and at that point the A/C would shut off (this is caused by the cut off on the comp) the fans would go to high and it would cool back too 1/4 ( L ) and after about ten minutes the A/C would come back and off we went again.
as i own a car yard i have plenty of workshops so i sent it to one and they said it was a blocked radiator. what i am about to list is what we have now done or replaced on the car up until yeasterday.
head gasket replaced and reco head, thermostat(various dec), water pump, new radiator, ECU, all hoses, temp sensor, whole system flushed and a new radiator cap. we also had the fans wired up to run on med/high when the A/C is on and high when the car reaches a preset point via a davies graig controller. all of this mad eno difference at all!!!!
we then took the trans oil cooler off and cleaned the condenser as some times a small leak from the oil cooler will block it up. this worked a bit and the temp sat lower on the gauge(just below the L) but still when you rev it too high or drive hard or a hill it climbs. so some one suggested i let some A/C gas out. we did this and the car stayed at 1/4 longer but eventually climbed but this was the first time we had any real gain. so we took it to a A/C shop and he said the head pressures were very high and this was because the car was getting hot.
so we are now at the point where the car actually runs cold at idle and takes a while to get warm thats how good the cooling is working! what we found today is if you hold your hand behind the thermo's at idle you feel some heat being sucked off the radiator and condenser but when you turn off ths A/C it drops, ok thats normal, but when you hold the revs at 2-3000 with the A/C off there is afair bit more heat as the engine is working harder and thats right but the moment you turn on the A/C the heat goes to a point where you cannot hold your hand there i mean it gets really hot and i dont think thats right and when you look at it thats been the problem all along--- fine at idle/low speeds cool days but on hot days/acceleration/hills or hard driving temp goes up.
could the A/C OVERHEAT THE CAR? when it does get hot if i slow down or stop the fans cool it down very quickly