I need to recharge the ac on my 04 dakota (4.7L). i have the hose and the refrigerant but when i hooked the hose to my truck the gauge went dangerously high and i was scared to hook the can up. my hose will only fit one of the connections so i assumed that must be the low pressure side was i wrong or is my gauge bad? step by step instructions would be the most helpful. thx
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You can try doing a coolant recharge, go to your local auto parts supply and get a can of refrigerant. Follow the instructions on the can. You have to locate the high pressure valve on the system don't worry the hose only fits on the right one. If all goes well hook it up start the engine and turn on the AC to high. Once the gauge reads charged you should see the compressor turning and you should have cold air.
Buy one or two cans of R134 (synthetic freon) with an attached pressure gauge/hose adapter to refill the refrigerant. Run engine with fan on high and AC on coldest temperature. Then remove the tiny blue plastic cap from the L or LOW pressure access point (located left of the engine) and recharge your system, checking gauge often. Let it run for 15 mins to circulate thoroughly. You can buy another refill can minus the adapter if needed, depending on how much of the original 27.4 ounces remained.
There are some 18 and 12 oz cans with Tinted Dyes for detecting leaks, some with Leak Sealants, some for High Mileage, and even Premium for 50% Faster cooling. It's as easy as filling a tire with Fix-a-Flat.
Source: Just fixed a 2004 Mitsubishi Galant LS with a flashing AC light and now I'm FREEZING.
YOU NEED A R-134 GAUGE SET TO CHECK LOW PRESSURE SIDE AND HIGH PRESSURE SIDE.YOU ALSO CAN BUY A LITTLE CHEAPER GAUGE TO CHECK YOUR AC LOW BLUE SIDE AND HIGH RED SIDE AT ANY AUTO ZONE OR ADVANCE AUTO PARTS.WHAT YOU DO WHEN YOU GET YOUR GAUGE SET HOOK GAUGE TO LOW PRESSURE SIDE BLUE CAP PORT AND GAUGE TO HIGH SIDE PRESSURE RED CAP PORT.YOU CRANK CAR UP GET IT OPERATING TEMPERATURE.THEN TURN AC ON HIGH COOL LET RUN 3 TO 4 MINUTES.CHECK LOW SIDE GAUGE READING SHOULD BE 28 - 32 PSI. HIGH PRESSURE SIDE GAUGE SHOULD 199 - 228 PSI. THATS NORMAL CHARGE. SEE YOU CANT JUST RECHARGE AC SYSTEM UNTIL YOU CHECK IT FIRST YOU WILL DAMAGE SYSTEM .NOW YOU CAN GO TO AUTO ZONE PARTS BUY A CHARGE CAN WITH GAUGE AND HOSE.ATTACH TO IT.YOU NEED MORE THAN ONE CAN.WARNING MAKE COMPRESSOR IS RUNNING WHEN YOU TURN ON AC .BECAUSE IF COMPRESSOR NOT RUNNING CHECK FUSE AND AC COMPRESSOR RELAY.IF BOTH OKAY.YOU COULD HAVE OPEN CLUTCH COIL A FAULTY LOW PRESSURE SWITCH WILL CAUSE AC NOT TO WORK. IF LOW PRESSURE GAUGE BLUE SIDE PRESSURE IS 28 OR 30 YOU DONT NEED A CHARGE.PROBLEM SOME WHERE ELSE.BE SURE TO WEAR SAFETY GLASSES WHEN WORKING ON AC SYSTEM.
Your car uses R-134A, readily available at most auto parts stores. Best bet is to get a refill kit that includes the refill hose (get one with a pressure gauge attached if possible to ensure you don't overfill the system). Recharging is pretty straight forward. Turn the car on with the AC on HIGH, locate the low side AC line (will have a screw on cap). Attach the refrigerant to the hose but don't puncture the can until the other end of the hose is attached to the low side valve. Once both ends are attached, turn the screw on the hose to puncture the can of refrigerant; the car should suction the refrigerant out of the can. Disconnect the hose when the can's empty and check the vents on the AC. If its cold and frost develops on the AC lines under the hood, you're good to go. Best of luck and post back with any questions.
You can only attach the the recharge hose from the kit to the low side ( A/C service port) and the cap should be blue with a leter L on it. Good luck and follow the instruction and don't over charge the system. With the AC on the coldest setting, use a thermometer in a middle vent. Normal vent temperature readings will vary depending on the (ambient) outside temp. The vent temperature should range from around 42-55 degrees in my experience. If normal gauge readings are obtained and the vent air is cold - STOP don’t overcharge the system. The only proper way to remove refrigerant is with a AC recovery machine so if this is being done at home I can’t emphasize enough not to over charge the system. And actually the best way to insure the proper charge is in a system, is to use an AC machine to recover the R134a and then evacuate and recharge the system with the correct amount. Most cars have the specified amount on a decal under the hood. Good luck and hope this helps.
First you need to find the low side inlet valve. It will have a black or chrome valve cover that you just screw off. You will see two close to each other, the one you are looking for is the large one. You will need to purchase 134a freon from your local auto store or superstore. Be sure the hose has a gauge on it as overfilling is not a good thing, you could burst the system. Then you turn the air on Max ac and hook up the hose to the valve you found earlier. Then follow the directions on the can. If you need further help, please ask.
The low side fitting you hook to is not under the hood(Not in engine compartment)To charge ac you MUST attach charge hose to fitting on the side of the aluminion acumulator LOCATED behind right (pass) headlight, reach under fender in front of right front tire, behind bumper.BELIEVE ME it is there, on side of tank. Reach under and feel for it.