When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
long story short i used to have pickup trucks and that didnt make enough sense, so i got a van and wow what a difference. i grew tired of not being able to standup in there so i was looking into hightop vans, box trucks, etc....i found this bus and fell in love.
okay one last experiment today was testing all the grounds.
i looked at all the connectors for the pcm in the book and i found 5 of interest. because how could the pcm create a ground? it cant, it has to create continuity to a physical ground. so that is what its not doing for the ac relay. i went ahead and tested all of them and unfortunately they all passed!
A PCM ground won't cause your specific issue, it would cause widespread problems.
Go back to post #8. Did you check that circuit between the PCM and the relay socket? If you have continuity there, I'd conclude the PCM's output driver has failed.
I made an apparatus so i can keep everything intact and switch the compressor on/off as needed. when switched off, the psi would climb to 80, the 12oz cans were able to juice it up until a certain point, so i would flip it on, and when the psi went down to 30, 20, 15, then the cans could overcome it and fill it some more.
to my surprise in the midst of all this, i switched the compressor off, yet it was still running! i had it on maxac. i flipped the dash switch to vent and it shut off. something occurred somewhere. there must be a sensor or circuit somewhere i dont know about, obviously the pcm was happy and doing its job. now i do have rear ac. and, a plethora of secondary circuitry that controls it. i traced out every single wire and can affirm the purple demand wire goes through some of it before it goes to the hi/lo pressure switches in the engine bay, infact, i plucked it from all that rear ac circuitry and made it go directly to the engine bay as if it was stock so i can troubleshoot easier. its very strange, the ecm now works. a few people have recommended i fill the system, and after exhausting every possibility and even trying to explain to them it does not matter i said "ok fine". i will have to give credit where its due and appreciate their simplistic approach.
unfortunately i had a blowout during this filling process. the condenser unit midway under the vehicle had some corrosion, the mileage is low but it has seen alot of salt, stage 1 as id call it, to where the major things are okay, but it has nipped at some of the little things, the gooseneck shaped metal fitting gave out, and about 4 cans if refrigerant and a half oz of oil with dye hissed out.
a few days ago the gas tank where there is a strap and trapped moisture caused rot a hole developed and i lost 7 gallons of gas overnite. it has not been an easy ride!
i clearly now will have to vacuum the system and repair the hole in the condenser. it will not make sense to get a new condenser because it is made by carrier and costs $1100. plus the fittings for all the hoses are in the kindof shape that they are best left alone. theyd have to theoretically be cut off and hoses redone with new fittings, or extensions added on, or new hoses alltogether, not a rabbit hole i want to go down.
