Jeep: A/C, electronic leak detector, r 134a

Question
Hi Crhis.  How do I charge the A/C on my 96 Grand Cherokee?

Answer
Hi Carol,

This is kind of tough to answer. To handle refrigerant properly, you should have a certified Recovery station. Venting CFC-12 to the atmosphere has strong regulations and repercussions, both in law and in environment. Most of the DIY kits at auto parts stores are only for partial charge scenarios, and are not recommended by any manufacturers or certified professionals. Most contain chemicals that were not designed for your system, and have been known to even cause problems. DIY is great, and it can save you money, but in A/C systems it really pays to have a certified shop take a look at it.

I apologize for not giving you an answer that you'd probably like to hear, but I'd be remiss if I didn't answer this directly. Gone are the days of venting refrigerant to the atmosphere, and really, that includes recharging your vehicle every year. All that does is contribute to a year-long vent that cycles continuously -- the A/C system was designed as a sealed system, and adding refrigerant should never be confused with maintenance (a common misconception). The training and tools for proper A/C handling and repair are an absolute must for anyone performing this kind of work.

I would suggest finding a certified A/C repair shop in your area -- all dealers are required to be. I understand all of the various reasons for not wanting to visit a dealer, and there are some really great independent shops ready to do the same quality work. If you have a good, honest repair shop, I'd let them look at it.

If the system is low (or empty), a proper diagnosis is in order. A charge and leak test typically runs around $85-135, depending on the current cost of R-134a, the labor rate, and how their testing is executed. Normally, the charge is done, and the technician will leak test the system with an electronic leak detector. If the leak is found, a repair is made (additional $$), and the system is evacuated and recharged. If no verifiable leak is found, then the tech will install an approved dye in the system, which is much better for accurately diagnosing smaller leaks. Sometimes, the dye takes hours, days, or even weeks to show up, so it may be a two-stop job. Most customers return when the system stops operating, and the leak is found and repaired then.

Good luck to you!