Question about 1999 Jeep Grand Cherokee

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I need to add refrigerant and would appreciate confirmation of the low pressure point of access.

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It's the one with the blue cap. Your hose won't fit on the high side, so you're safe.

Posted on Jun 30, 2009

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  • Master
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The low pressure is the big pipe. there is two pipe there one small and the other is big.

Posted on Jun 30, 2009

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2 Answers

When i turn on the a/c,the compressor does not work


CHECK REFRIGERANT CHARGE. USING A MANIFOLD GAUGE SET. HOOK MANIFOLD GAUGE SET TO LOW PRESSURE PORT AND HIGH PRESSURE SIDE PORT. LOW SIDE PRESSURE SIDE SHOULD HAVE 25 - 36 PSI AND HIGH PRESSURE SIDE SHOULD BE 178 - 237 PSI. IF LOW SIDE PRESSURE SIDE READ BELOW 20 PSI THE LOW PRESSURE SWITCH WILL NOT TURN ON THE AC COMPRESSOR CLUTCH NEED TO ADD LITTLE MORE REFRIGERANT. IF REFRIGERANT LEVEL CORRECT CHECK AC COMPRESSOR FUSE AND RELAY.IF POWER GOING TO AC COMPRESSOR CLUTCH YOUR COMPRESSOR CLUTCH HAS OPEN WINDING. AC COMPRESSOR CLUTCH NEED REPLACING.

Aug 11, 2011 | 1997 Nissan Pathfinder

1 Answer

I have a 98 mazda 626, the coolant is low, I'm confused as to where the low pressure gauge is located on the engine and do not have an owners manual, help I'm buning up


Are you talking about coolant or refrigerant? There is no low pressure gauge on the engine. I am going to assume you are referring to the A/C refrigerant as you say you are burning up. I am also going to assume you are wanting to know where the low pressure inlet valve is so you can add refrigerant to the system. You have a leak or you would not need to add refrigerant. Know that it is illegal to add refrigerant R134 to any system with a leak until you have the leak repaired. You also must add the correct amount to the system. This requires repairing the leak and then having the proper gauges to determine when you have added the correct amount of refrigerant. My advice, and the only advice I can legally give you, is to take your vehicle to a professional and have the leak repaired and the system charged.

Jun 17, 2011 | 1998 Mazda 626

1 Answer

Looking to charge a/c and need to find access point


approx, 3 inches below air cleaner box. add refrigerant on the low side port. The low side is the smaller port. have a good day ! YOU MAY HAVE TO REMOVE AIR BOX TO GET ENOUGH ROOM.

May 08, 2011 | 1997 Chevrolet Lumina

1 Answer

My 1993 cadillac deville A/C is not blowing cold air in fact it switches to ECONO soon as I turn the A/C on, R12 is currently the last refrigerant used does the compressor need to be removed to convert the...


The A/C system is most likely low on refrigerant. A pressure switch will disengage the clutch on the compressor if it drops below a certain point. The compressor will not need to be removed for conversion to 134A. The conversion kits are available at most automotive retailers in addition to leak detecting and fixing agents which can be introduced into the system. It is very important to identify the low pressure access point in order to use these products and read all the safety warnings before attempting this on your own.

May 04, 2011 | 1993 Cadillac DeVille

2 Answers

Charging an empty freon system and clutch wont engage for recharge


you cant just charge it. it needs to be evacuated with a vac pump. The clutch will not engage until it has enough pressure.

Jul 22, 2010 | 2005 Honda Civic

2 Answers

FACING THE CAR, WHERE IS THE EXACT LOCATION TO ADD FREON TO A 1997 CHEVY MALIBU. WE FOUND A RED CAP BUT UNDERSTAND THIS IS NOT WHERE YOU SHOULD ADD. HELP .....


The low pressure refrigerant port is near the firewall2.gif, just after the receiver/dryer. You'll need a gauge and preferably an ac test manifold. You can use the manifold to add refrigerant up to the point where the system maintains the pressure level in the green area. There should be a blue cap on the low pressure valve.
I believe your malibu take's 12 ounce's of R134, don't over charger the system. You'll blow O rings and worst kill the A/C compressor.
Good luck and hope this helps. Here is a link for A/C recharging. http://www.geocities.com/vantaray/air_conditioning.htm

Aug 19, 2009 | 1997 Chevrolet Malibu

2 Answers

''does a new radiator need refrigerant added to it''


You need to replace the condensor, then take it to a shop to have the a/c system evacuated and recharged to purge moisture because the system was opened. That will cost around $150. You do not need to replace the receiver/dryer/suction accumulator even though they will tell you that you do.
go to car-part.com to find prices of condensor from salvage yards. Page with asterisk on it is the lowest priced part.

--------------------------------------
The Refrigerant Cycle
During stabilized conditions (air conditioning system shutdown), the refrigerant is in a vaporized state and pressures are equal throughout the system. When the A/C compressor (19703) is in operation it increases pressure on the refrigerant vapor, raising its temperature. The high-pressure and high-temperature vapor is then released into the top of the A/C condenser core (19712).
The A/C condenser core, being close to ambient temperature, causes the refrigerant vapor to condense into a liquid when heat is removed from the refrigerant by ambient air passing over the fins and tubing. The now liquid refrigerant, still at high pressure, exits from the bottom of the A/C condenser core and enters the inlet side of the A/C evaporator core orifice (19D990).
The A/C evaporator core orifice is the restriction in the refrigerant system that creates the high pressure buildup in the A/C evaporator core (19860) and separates the high and low pressure sides of the A/C system. As the liquid refrigerant leaves this restriction, its pressure and boiling point are reduced.
The liquid refrigerant is now at its lowest pressure and temperature. As it passes through the A/C evaporator core, it absorbs heat from the passenger compartment airflow passing over the plate/fin sections of the A/C evaporator core. This addition of heat causes the refrigerant to boil (convert to gas). The now cooler passenger compartment air can no longer support the same humidity level of the warmer air and this excess moisture condenses on the exterior of the evaporator coils and fins and drains outside the vehicle.
The suction accumulator/drier (19C836) is designed to remove moisture from the refrigerant and to prevent any liquid refrigerant that may not have been vaporized in the A/C evaporator core from reaching the A/C compressor. The A/C compressor is designed to pump refrigerant vapor only, as liquid refrigerant will not compress and can damage the A/C compressor.
The refrigerant cycle is now repeated with the A/C compressor again increasing the pressure and temperature of the refrigerant.
The A/C cycling switch (19E561) interrupts compressor operation before the external temperature of the A/C evaporator core gets low enough to cause the condensed water vapor (excess humidity) to turn to ice. It does this by monitoring low side line pressure. It is known that a refrigerant pressure of approximately 210 kPa (30 psi) will yield an operating temperature of 0°C (32°F). The A/C cycling switch controls system operation in an effort to maintain this temperature.
The high side line pressure is also monitored so that A/C compressor operation can be interrupted if system pressure becomes too high.
The A/C compressor pressure relief valve (19D644) will open and vent refrigerant to relieve unusually high system pressure.
Clutch Cycling Orifice Tube Type Refrigerant System 75cc8eb.gif
Item Part Number Description 1 19E762 A/C charge valve port (low side) 2 19E561 A/C cycling switch 3 19C836 Suction accumulator/drier 4 19703 A/C compressor 5 19D644 A/C compressor pressure relief valve 6 19D594 A/C pressure cut-off switch 7 19E762 A/C charge valve port (high side) 8 19712 A/C condenser core 9 19D990 A/C evaporator core orifice 10 19860 A/C evaporator core 11 — Low pressure vapor 12 — High pressure vapor 13 — Low pressure liquid 14 — High pressure liquid

  1. Connect the R-134a A/C Refrigerant Center to the low- and high-pressure service gauge port valves.
  2. Evacuate the system until the low-pressure gauge reads at least 99.4 kPa (29.5 in-Hg) (vacuum) and as close as 101.1 kPa (30 in-Hg) as possible. Continue to operate the vacuum pump for a minimum of 45 minutes.
  3. Turn off the evacuation pump. Observe the low-pressure gauge for five minutes to make sure that the system vacuum is held. If vacuum is not held for five minutes, leak-test the system, service the leaks, and evacuate the system again.
  4. Correctly oil match the system to verify that the correct amount of refrigerant oil is present in the system. For additional information, refer to Refrigerant Oil Adding in this section.
  5. Charge the system with the specified weight of refrigerant and refrigerant oil.
  6. When no more refrigerant is being drawn into the system, start the engine and select MAX A/C operation. Set the blower motor speed to maximum and allow the remaining refrigerant to be drawn into the system. Continue to add refrigerant into the system until the specified weight of R-134a has been added. Close the charging cylinder valve and allow the system to pull any remaining refrigerant from the hose. When the suction pressure drops to approximately 207 kPa (30 psi), close the charging hose valve.

May 14, 2009 | 1995 Nissan Maxima

1 Answer

Where do you add freon in a 1997 chevy malibu. Not familiar with engines at all and don't have many tools. I have bought freon in a can with a little hose but don't know where to add it. Please make your...


The low pressure refrigerant port is near the firewall, just after the receiver/dryer. You'll need a gauge and preferably an ac test manifold. You can use the manifold to add refrigerant up to the point where the system maintains the pressure level in the green area. There should be a blue cap on the low pressure valve.
I believe your malibu take's 12 ounce's of R134, don't over charger the system. You'll blow O rings and worst kill the A/C compressor.
Good luck and hope this helps. Here is a link for A/C recharging. http://www.geocities.com/vantaray/air_conditioning.htm

May 11, 2009 | 1997 Chevrolet Malibu

2 Answers

Where is the AC Low pressure valve on a 1999 Pontiac Grand Prix?


sometimes its behind the alternator real close to the firewall. Find the bigger of the two hoses and pipes the low side is always bigger. Also the cap is blue and the fitting for the charging can will only fit on the right valve.

Apr 24, 2009 | Pontiac Grand Prix Cars & Trucks

1 Answer

Where to add refrigerant to a 1997 gmc sierra. It looks like there is 2 places 1 is pointing up and 1 is pointing out. 5.7 V8


Look on the threaded caps that cover the connections,on top of the caps one should have a L for lowside pressure and the other a H for high side.Add the refridgerant to the low side.If your doing it yourself and buying a ac recharge kit from a parts store or shopping center, the kit comes with the refridgerant and the hose you will need to recharge it.The hose fits only the low side connection on your ac line and willnot fit the high side,so you shouldnt have a problem.Hope this helps you.

Mar 05, 2009 | 2002 Chevrolet Venture Passanger

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