Have a 2003 Liberty with 200,000+ miles. Have no A/C. It leaks all it’s coolant in 2-3 days time. After 7 recharges with dye, the dealership was unable to find a leak. NO LEAK at all. Not even a little one. Called Chrysler who opened a special case, but then closed it saying they could not repair an A/C if there was no leak but I was welcome to bring it back later. The problem has really been building over a couple of summers and we are now in a condensor, 2 evaporators, a high side swicth and various hoses and seals. Any ideas where the coolant is going? Out of the box suggestions?
As you can see from the attached diagrams, there’s more to the system. It can stop working even if it doesn;t leak. A good shop that specializes in automotive AC systems (many radiator shops do) should be able to diagnose and repair it for you.
Question: did your shop change these thing sbecause you asked them to diagnose and repair the problem, or because you told them what parts to change? If the former, and they keep charging you, you need to go elsewhere. Actually, go elsewhere anyway. These guys either aren’t able or aren’t willing.
A leak on the low side may only occur when the AC is off and pressure equalizes throughout the system, but oil, and therefore dye, will not be in suspension with the refrigerant when the system is not operating and tracking the leak with the dye is very difficult. A determined, experienced AC mechanic can eventually find any leak but dealerships must use factory authorized techniques and flat rate times which can totally frustrate dealership mechanics. There has been a great deal of dismantling done at this point and dye tracks from opening connections would require totally cleaning up all dye and starting over. Find an AC specialist with a good reputation and ask him what he can do.
The leak might be at the evaporator under the dash. Using a dye to locate an AC leak may take time before it’s revealed. Especially at the evaporator. Take the vehicle to a shop that specializes in AC repair and ask that they use a refrigerant sniffer to locate the leak. I bet they find it pretty quickly.