Bad expansion valve symptoms?
Anyone ever see a bad epansion valve/ symptoms?
I just did some homework on the pressures and temps according to the MB cd and mine are off with correct amount of freon. 91 300E with R-12 that was just evacuated, flushed and recharged at an MB independent shop.
MB spec: Ambient 104 F / 40% Relative Humidity, High Blower Speed=
Low side 29-36 psi High side 377-391 psi Duct temp 55-60F.
Actual readings 105 ambient/ 25% RH, Low side 45-47psi High side 220-235 psi and 80-83F duct temp. That is with the front fans on high and helper fan.
Noticed last night that the guages will slowly fluctuate about 10 to 20 psi. the high side will go up 20 while the low goes down 8 or 10 at the same time, then they go the other way and over and over but like 3 or 4 times a minute.
This morning it was 86F ambient 38% RH on the way to work and on low it only blew 65F....same as when it was 105F yesterday. So Im wondering if the expansion valve is limiting the freon to the evap to 65F on low blower or any blower for that matter , or if the evap is dirty and clogged on the outside, but it blows hard.