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Post by mikeinfhaz on Aug 10, 2009 17:01:57 GMT -5
i searched the forums and did not find what i wanted to know, pro'lly overlooked it!
my a/c is clogged. I have evaporated the system and changed out the valve cores (schraeder valve) but the issue is still happening.. the compressor seizes up and the belt slips resulting in A) a high pitched squeal that is embarrasing and B) loss of compression and no cold air!
somewhere in the system is a clog, or blockage. what do you guys think is the most likely cause? could it be the expansion valve? or something else?
fwiw, when i purchased the Monty there was that chartreuse stop-leak type refrigerant in the system. that is all but gone now that i changed out the refrigerant (due to the valve core leaks)
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Post by dannytuned on Aug 10, 2009 17:09:16 GMT -5
Sounds like you need a new compressor. If there was a blockage somewhere the compressor would keep going and the emergency pop-off valve would vent.
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Post by bdmontero on Aug 10, 2009 19:36:03 GMT -5
Well a new a/c system includes a new compressor. a filter/drier. your system being properly evacuated/flushed, new compressor with proper oil and refrigerent installed and leak tested/pressure tested. Also it is IMPOSSIBLE to thoroughly clean out an old condensor where the compressor has seized and thrown god knows what into the veins. SO a new condensor would be a must.
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Post by mikeinfhaz on Aug 10, 2009 20:28:50 GMT -5
hate to sound ignorant.. but i dont seem to locate an "emergency pop off valve"
the system was recently tested and the high side pressure was way to high... and the low side in accordance was lower than expected. the concensus was there is a blockage somewhere in the lines, but i cant say that is either right or wrong diagnosis. the compressor seems to be working fine, but i'll take your advice and check into this further..
just curious, what and how does the expansion valve go out? (even tho is pro'lly not the problem?)
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Post by bdmontero on Aug 10, 2009 21:05:44 GMT -5
expansion valve/ orifice tube is a small filter inside the system that turns the freon into a gas such as it goes from a high pressure liquid to a low pressure vapor??(Can't remember about that for sure... if I am wrong please correct me) Anyway ANY type of debris in the system can easily clog this and cause high pressure in the system.
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Post by buggzyy on Aug 10, 2009 23:35:31 GMT -5
expansion valves are easily changed from the outside underhood you may evacuate system and pull the valve and inspect it if you have crap in it then you may have other issues also was oil added to the system each time you pulled the refrig. out if not you may be low on oil as well. but your pressures would indicate otherwise. try this run the system and feel the lines where you have a hot spot then a cold spot thats where the blockage is.
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Post by bdmontero on Aug 11, 2009 17:13:35 GMT -5
Well I have seen vehicles in the past where the expansion valve is connected to the evaporator itself. So you might have to pull the dash to remove the expansion valve. So I think it depends.
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Post by dclambertt on Sept 2, 2015 16:02:34 GMT -5
Just to add to this old thread in case someone searches and finds it, the expansion valve on my '01 was inside the firewall attached to the evaporator. It can be removed fairly easily without removing the dash, just removing the glove box. Getting the valve loose from the evaporator was a bit more difficult with all the sticky insulation foam wrapped around it.
Here's a basic DIY, with a few skipped steps, from TROUTDOG.
s156.photobucket.com/albums/t34/troutdog311/Expansion%20Valve/?action=view¤t=100_3001.jpg
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