Thanks everyone. So Uniblurb, the suction hose comes with the manifold gauge set you linked me right? Also where is the drain valve for the evaporator? I assume when you say firewall that's the engine bay side but I'm thinking because the evaporator is behind the dash it may be inside the cab.
So Saturday I took it to another shop (the first one was J-Mac Radiator, the second was Aamco) and they actually diagnosed it right and said it's low on refrigerant. $160 to evacuate, refill with dye and refrigerant. Okay, so I asked how much to just evacuate it...$130. Wow, what a rip off.
Yes, that manifold gauge set comes with 3 hoses; Red - high pressure hose, Blue - low pressure hose, and Yellow - suction hose also referred to as vacuum/refrigerant hose.
It should be noted the high and low pressure hoses come with different size quick disconnect connectors on the ends so you can't connect them to the wrong ports on the lines.
I will say it was difficult pouring 1/4oz of that 1oz bottle of UV dye in the suction hose small ID hose. You shouldn't have it connected to the gauge set and have the other end up while you pour it in. Wear rubber gloves and clean it all off the outside hose connectors before connecting it to the can tap or manifold gauges. One thing which would help on cutting down on the mess is go to your local pharmacy and ask them for a plastic syringe. They should just give you one (no needle) and that way you can pull 1/4 of the bottle of UV dye out while injecting it into the yellow suction hose end.
The evaporator doesn't have a drain but it's the drain coming out of the bottom of the HVAC box through the firewall. It's pretty difficult to see/find from underneath and in the middle of the firewall somewhere underneath the evaporator tubes. If you run your AC long enough you may be able to see the dye coming out with the AC drain water rather than having to swab the inside of the drain with a q-tip. That is if there's a leak and hope there isn't.
What a rip those shops want $130 just to evacuate/recover the 134a! Plus like I said they're just going to turn around and sell it to someone else as a recharge since they clean it.
Good call on the Denso compressor oil. I did already order two 8 oz bottles of PAG before seeing your post. Where do i find how much goes in each component? Also, I only ordered one bottle of flush solvent 32 oz. Should that be enough for the evaporator and condenser?
That flush should be more than enough for flushing out the evaporator and condenser. In fact you should have about half left over since 8oz through each component should be sufficient. Hopefully you have a compressor and make sure you attach a hose or something to the outlet of those components just so you don't blow it everywhere. Safety glasses are a must and I'd wear some rubber gloves.
I did some research and your 01 4.7 AC system takes 24oz of 134a total when empty. This is exactly 2 of the 12oz cans of 134a you bought. But you should still watch the manifold gauges when getting near the end of the 2nd can so you don't overfill it. And the performance chart I posted a link to in my other thread is correct for your 01.
It's 'clear as mud' on how much PAG/refrigerant oil your 01 takes and how much goes into each component? I'm including a chart below for the 01 and how much each component takes is spelled out.
But here's where the confusion starts. They say the AC system takes 5.75oz of oil but it looks like they aren't including the compressor? And if you add up the amounts in the other components it equals 6.09oz yet they say it takes 5.75oz?
And then if you add the amount of new oil to the new compressor that you measured out of the old compressor how do you know this is correct?
They sure don't make the WJ FSM's as easy to understand as the ZJ FSM's which gives you total AC system oil capacity including compressor. Someone else may need to chime in here to help? And know many may just split the oil between the compressor and drier/accumulator.
BTW, new o-rings should be used on all connections and coated lightly which pag oil. Once everything it together is when you'll need to borrow a AC vacuum pump. And it should be noted it draws/boils the air/moisture out but leaves all the oil in the system.
Below is the refrigerant oil capacity chart for the 01 and someone else may need to help clarify it.