Hey guys- I'm working on the Fiesta that is blowing warm air.
I had it for another concern a little while ago and while on the test drive, I noticed that the cold air would come and go- typically with acceleration, kinda like the WOT cut out. Any way, customer didn't mention it as a concern, so I left it alone. A few weeks later she calls me saying that it's not working and that they added some refrigerant. So the first thing I did was vac it down and recharge with the correct amount- seemed to work ok. Well, she called me again stating that it went back to not working again. With the gauges on it, not running I saw 375psi on the LOW side and I think 75 on the high side. Running at idle, I'm seeing around 400psi on the high side and around 35 psi low. Raising the engine speed brings the high side down to around 300 or a bit more and the low up to 75-80 psi. All values are inside a climate controlled shop at 71*F and low humidity.
Any ideas? Stuck/sticking expansion valve?
I had it for another concern a little while ago and while on the test drive, I noticed that the cold air would come and go- typically with acceleration, kinda like the WOT cut out. Any way, customer didn't mention it as a concern, so I left it alone. A few weeks later she calls me saying that it's not working and that they added some refrigerant. So the first thing I did was vac it down and recharge with the correct amount- seemed to work ok. Well, she called me again stating that it went back to not working again. With the gauges on it, not running I saw 375psi on the LOW side and I think 75 on the high side. Running at idle, I'm seeing around 400psi on the high side and around 35 psi low. Raising the engine speed brings the high side down to around 300 or a bit more and the low up to 75-80 psi. All values are inside a climate controlled shop at 71*F and low humidity.
Any ideas? Stuck/sticking expansion valve?