My wires have been cut, I am attempting to get the a/c fuctioning. I have located the brown and bk white wires that go to the low pressure switch. The wires are hangign above the pass foot area. Where is the switch? Bill
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If I understand your question correctly, its the rotary AC switch right on the end of the console. The multifunction switch has an electrical connection to switch on the magnetic compressor clutch and the rear fan, and a Bourdon tube that inserts into the evaporator to detect icing. Late & early switches were different in the amount of Bourdon-tube they had sticking inside the AC housing but the electrical hookup was the same.
Stick with me Jack!. Yes it is the icing switch I am looking for. I have 2 hoses that run to the evaporater. 1 big 1 little. The smaller hose has a copper diphram lookin'disc with a tube that makes a short loop to the neck of the larger hose fitting, the end looks like a sensor and was held to the large hose with dum dum. This is an early 1362 car.What is the switch operated by? I am afraid there is a wire behind the right air outlet on the dash that looks like it could be a capilarry tube with no end on it. I'm going back under the dash.
I am all but convinced that the tube from the evaporater with the end missing was my icing switch. Now all I need is a n/c switch with a remote capillay that opens when it gets cold. Now, dosent that sound like a refrigerater defrost switch? Any ideas?
snip.....
Thats the so-called AC expansion valve which also has a Bourdon-tube sensor that was originally held to the input line with a tricky little chrome clip, then the whole works was covered with AC goo to prevent sweating on the passengers leg. Bourdon- tube devices, usually gauges, are filled with an alcohol mix & expand/contract with temp changes. Incidently, vast improvements to many AC systems can be easily done by digging the tiny conical screen filter out of the side leg of the expansion valve, cleaning & returning it. No freon flow thru a plugged filter= no cool air....
Thats the so-called AC expansion valve which also has a Bourdon-tube sensor that was originally held to the input line with a tricky little chrome clip, then the whole works was covered with AC goo to prevent sweating on the passengers leg. Bourdon- tube devices, usually gauges, are filled with an alcohol mix & expand/contract with temp changes. Incidently, vast improvements to many AC systems can be easily done by digging the tiny conical screen filter out of the side leg of the expansion valve, cleaning & returning it. No freon flow thru a plugged filter= no cool air....
I have located a capilary tube therostat that opens when exposed to cold. I don't think I will be able to make it touch the evaporater' but I can get close. My cicutry works the clutch. I will also use a high limit @ 300 psi to open the circut to the clutch. My fittings for filling the system will be here tomarrow. I should be cool by friday. I will clean that screen. but the hose connection is between 3/4 and 7/8, I got to figure that out. I will not put pliers on it. would that be 20-21 mm?
http://www.panteraplace.com/page123.htm about 3/4s down the page.
I took the hose off and can hold the expansion valve in my hand. The conical screen looks like new, My a/c expert was impressed and wrapped it up for later installion, after we flush the lines with r 134a. One of the final fitting came in the wrong size. Reordered, will arrive fri. AM. I wired my high limit in line with the themostat and can hear he clutch engauge. Mike, you know I am running R134a so I am going to try the expantion valve I have. It is cheap enough to spill a little. I replaced the foam between the a/c outlets and the evaperator box. This is where I slid my themostat wire into the evaperator, I hope I have enough adjustment, I figure I could move it further away from the evap. if nessacery. I think I go blow some air through some lines. Bill