Filled AC with 2 cans of r134 but still inconsistent in cooling. I check the high/low with a gauge and get 25psi low and about 135psi high. So I put in another can in the low and it takes it all but the hi/low pressure readings do not change. What am I doing wrong?
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Re: AC not cooling in '98 blazer
Adding another pound should have increased the pressure. Are you sure the gauge set valve was not closed. The system should hold approximatly 3.4 lbs.
Did you purge the charge line of air before charging?
If you introduced air in the system, it will not compress and result in low pressure reading.
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If the compressor is working, a mechanic would check the low and high gauge pressure. The freon has to flow thru the system to work, and the cooling fan draws air thru the condenser to get rid of the heat from inside the car. If the ac clutch is working but the gauges show equal pressure, the compressor may be faulty.
Most vehicles have a low pressure switch that prevents the compressor from engaging so as to prevent damage to the compressor. You need to place a gauge set onto your AC to read the high and low sides of the system. Probably have lost enough gas(R134) over time to prevent the compressor from engaging. You can jump the pressure switch to check it with a simple jumper wire.
2.5 lbs sounds like a lot of gas thats about 1.1kgs ,anyway i think it will work on around 800grms of R134 ,now use the same weight of gas but start around the 800 grms mark as too much gas will hold the engine back ,Now R134 gas is different in its cooling properties and the pump pressures are different as it doesnt need such a high pressure or a big cooling radiator ,i have no idea where the fillers are but look pump for the fattest tube and follow this back to the firewall and you will find the low pressure connection here.Fit the adaptor here for the R134 and then if you havent a vacumn machine to do it properly just start engine and turn AC on with the fan motor and let it charge and as the pressure builds up the pump will click on and **** the gas in for you.Now remember that as R134 need a bigger cooling radiator to cool the high pressure hot gas so the smaller rad used for R12 will not be as efficient it will work when moving better than stationary so make sure that the exterior of the rad is well clean and no dead bugs on it .As stated it will work and if you have any R12 gas still in the system it will mix ,I mix CO2 from a beer barrel gas bottle into my machine with R134 as its so much cheaper iam paying 248euros for 15kgs of R134 so the average car of 750 grms is costing me about 14 euros in gas alone without the 2500 euros for my machine
buy r134 can w/pressure gauge at local parts or department store. Folllow directions on can as far as application. The valve only fits the low pressure line, so there is no way to accidentally attempt charging high pressure side. Unscrew cap, attach valve of r134, check gauge. if fully charged already, do not overcharge... won't cool better, only cause damage.
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.
somewhere around 1.6 pounds (1lb.14ounces) of R134a if system is evacuated and 3 ounces of oil with new compressor. keep pressure on the low side around 34-37psi & it should blow snow. Below are normal car AC pressure readings with 134A.
Normal readings on high and low side with AC OFF (static pressure) – Depends on outside temperature, but normally is between 80-105 PSI
Normal low side reading with AC on high speed and MAX & engine at 800-1000 RPM’s – Ranges from 25-35 PSI –
Normal high side reading ranges from 200-350 PSI
Don’t assume that if adding little Freon is good that adding a lot is better! Overcharging just a little can decrease the performance of the system and possibly damage the compressor.
DIY recharge kit:
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.
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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.
You might check the coolant level after the engine cools,if it's low add 50/50 mixture of coolant and water. Keep an eye on the level to see if it happens again. You might have a small leak in the system. Good luck
Your focus should not take freon. Freon is used in older cars from 1995 on back. Your focus should take R134 and the plug for your AC should be located under the passenger side wheel well (yes ford makes things so convenient). Just unscrew the little plastic crews in you wheel well and attach the gauge and can of R134 (should take a little more than 2 large cans).