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Not sure if I'm too late to answer this one, but you're describing a low refrigerant condition. The hissing noise and constant cycling of the compressor clutch are indicators of that. You should recover the system, record how much refrigerant was recovered, evacuate the system (with a vacuum pump), add A/C dye, and recharge the system to capacity. Common leak areas on these vehicles include the A/C condenser (located in front of the radiator), and the evaporator (located inside the dash, and requires complete removal of the interior dash to replace it). If you can't find a visible leak after running the recharged system with dye for several weeks and it starts to blow warm again, you will need to use an R-134a leak detector to "sniff" areas of the system for a refrigerant leak.
o god, try looking at cabin box filter. The only thing really is to remove the dash and all heater tubes and vents. I hope its easeir than this for you though. I have a transport that mice got into the heater system and i had to strip the inside entirely except for electrical. Mind you the van had sat for about a month with a blown engine, but it took around six to eight months to rid the smell as they of course did their #s in everything let alone the smell of death. you have to find it or it gets worse. best of luck to you. Anything you remove dont forget to wash it with soap and water.
these vents should snap in. If you look closely at the inside of the vent, there should be either two U shaped cuts on either side with the bottom of the U facing you, or maybey a couple of metal tabs. Either way, you should be able to place a precision screwdiver into the tab and pry it inward on one side then gently pull that side to you. It should rock outwards and come out of the dash if you pull it to the side you took out first. Let me know if this helps :)
Have replaced my heater core in my 2001 regular cab 4wd in december 2009. Had to pull the complete dash including the complete metal dash behind the dash that you see. Also had to remove the right passenger side inner fender well to acess the remaining two bolts that hold the heater core cover to the firewall. Its an insane job to do but the repair shop books call for 9 1/2 hrs to do the job. I'm not an expert but this is what it takes.
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