A Jeep Grand Cherokee features two air-conditioning service ports. Both are located on Cherokee's aluminum air-conditioning pipes, which can be found centrally in the Grand Cherokee's engine compartment.
Finding the Ports
Pop the Jeep Grand Cherokee's hood. Find the air-conditioning system's aluminum pipes. Look for a stretch of pipe connecting the Cherokee's compressor with the drier. This is the location for the low-side pressure connector. The remaining service port is the high-side pressure connector. Both ports will be capped.
The Low-Side Port
The low-side port is prefigured to fit Freon recharging kits. The Cherokee takes either R12 or R134a Freon, but the system is only intended for one or the other. Adding R12 to an R134a system causes damage to the air conditioner. R12 is used in vehicles predating 1984. Vehicles manufactured 1984 and later are required to use R134a.
The High-Side Port
The Jeep Grand Cherokee's air conditioner is a pressurized system. This pressure helps move air through the metal tubes and the system as a whole. The high-side service port is intended for maintaining and adjusting the systems pressure. Freon recharging kits do not fit this service port. Attempting to add R12 or R134a through this port damages the air conditioner.
- "Haynes Repair Manual: Jeep Grand Cherokee 1993 thru 2004: All Models" John H Haynes, Haynes Publishing Group; 2004
- US EPA: Recharging Your Car's Air Conditioner with Refrigerant
- IDQ: Low-Side Port Finder Tool
Jeep Grand Cherokee Oil Pressure Problems
Oil pressure problems are common in the Jeep Grand Cherokee, especially in older models that are starting to rack up the miles....
How do I Locate a Low Side Service Port?
A low-side service port is part of an automobile's air conditioning system. It can be found inside a vehicle's engine compartment on...
How to Check Fuel Delivery in a Jeep Grand Cherokee
The Jeep Grand Cherokee is a mid-sized, "unibody" sport utility vehicle manufactured by Chrysler's Jeep division. The Grand Cherokee debuted in 1993...
Troubleshooting a Jeep Cherokee AC
An air conditioning system contains many sections. It starts at the compressor that compresses the Freon to a temperature warmer than the...
How to Replace a Jeep AC Condenser
You should service the air conditioning (A/C) system on your Jeep every 60,000 miles to ensure proper ventilation. You can remove the...
How to Find the Low-Pressure Side of an AC Unit on a Car
The air conditioner on a car is designed as a closed, pressurized system. The system consists of a high-pressure and a low-pressure...
How to Replace Refrigerant in a 98 Jeep Cherokee
Recharging an air conditioning system on a 1998 Jeep Grand Cherokee is an easy task that can save an owner a repair...
How to Charge the A/C in the 2005 Jeep Liberty
Recharging a 2005 Jeep Liberty's R134a freon levels is an easy job. It is one of the simplest automotive air conditioning maintenance...
How to Recharge the AC on a 1994 Jeep
Periodically, you will need to recharge a 1994 Jeep's air conditioner. The system runs on R134a freon, and once the R134a level...
Grand Cherokee Air Conditioning Problems
The Jeep Grand Cherokee is a mid-sized all terrain vehicle that is suitable for in town driving, road trips, and off-roading adventures....