Re: A/C Recharge(what not to do)
Yes, you really need to know pressures before you mess with the A/C system. You got lucky. These systems have a high head safety and it seems some kind of blow off valve that I've never seen before. I've been doing A/C for over 30 years though not so much on cars.
You know the high side from the low side by feeling the temp of the hoses/pipes. The cold hose is the low side which is where you charge the system. If the system is totally empty and there's no temp. difference, the low side is bigger in diameter. You can also follow the lines and the one going to the condenser in front of the radiator is the high side.
All A/C systemsare sealed systems. The refrigerant never wears out like oil and should never need to be replaced. If you need a charge there's a leak. Leaks are a real bitch to find in a car. If a system leaks a lot and there's a big leak there's usually oil at the spot where it's leaking. The oil needs to be replaced too in this case. If it's that bad, you're best off getting it done by a pro.
Hi, Im JIM
2005 Grand Cherokee Laredo
4.7 Ltr engine.
So far K@N replacement air filter,hood scoops, 255/65/17 General Grabber AT2 tires, Magnaflow muffler and I trimmed the front valance under the bumper.
"An unarmed man can only flee from evil and evil is not overcome by fleeing from it."Col. Jeff Cooper