Question about 1993 Mazda MX-6

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1989 MX6 AC low pressure fill on compressor?

The can tap I have for R12 fits the valve on the compressor. Just wanted to assure this was correct, low press side? There is another smaller dia. valve near the radiator one of the hoses to the compressor so hoping I got it right?

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YES THE BIG ONE IS LOW PRESSURE

Posted on Jun 25, 2009

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Posted on Jan 02, 2017

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Where is the 123A port to charge the air conditioner on a 1989 Cadillac Allante


Unless that system was changed to Freon R-134A You wont be able to recharge it. Those used R-12. you cannot get r12 any more. It was banned. The low side port is what you are looking for, I you see the compressor mounted on the engine, follow the hoses one goes towards the passenger compartment and one goes towards the front of the car. The one that goes to the front is the low pressure side and it should have a fitting on it that looks like a tire pressure fill cap. That is the one that you want. NOTE that if the system has not been converted to 134a, you cannot use 134a. There are lots of things that have to be changed. It is not cheap to have it changed.

Aug 04, 2014 | Cars & Trucks

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Can you describe where I would find the low pressure port for the a/c system on an '07 Chrysler T&C? I found what I would think would be it up toward the back/left side of the engine compartment. ...


You missed the correct port alright, that is the high side. You don't want to connect to the high side. That coupling on the refill kit you have will only fit on the low side. Those fill ports are usually covered with a plastic cap that looks like a tire valve cap to keep dirt out. There are two lines that come off the AC compressor, follow those back until you find the valves, the low side is the valve your quick connect will fit on.

Jul 10, 2011 | 1996 Ford Thunderbird LX

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What type of refrig. does the AC use in a 92 dodge caravan


Unless the labels are missing from the car, it will state which type of refrigerant is used. Could be either R12 or R134a. If originally R12, it could have been replaced by R134a with an upgrade kit. The easiest way to tell if the labels are missing, is to look at the valves on the AC system. If they are Schrader valves (same as used on tires), then it is the older R12. If the caps are Red (high pressure side) and blue (low pressure side), then it is R134a. The sale of R12 to non-certified mechanics is illegal in all states as far as I am aware. R134a is available in most states and retro-fit kits are available in most states.

I have done the retro-fit on 2 vehicles with acceptable results. It is recommended to remove all the old R12 with a vacuum pump. Autozone (in my area anyway) rents these.

Good luck if you need and decide to retro-fit yourself.

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Can i use r134 referigerent in a R12 compressor


yes but you need to rcover r12 then retro fit the hi side and low side then vacume system then when you ad r134 you only ad 80 percent of what the original amount of r12

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1 Answer

Recharge a/c i have r12 which valve do iuse black or red


line that goes to compressor is low side line out of compressor is high side
always fill on low side
also r12 hase been band for sevral years and should not be used
if this freon is r-12 conpatible or replacment then your fine
after leak been repaired and system pressurized and vacumed out
start engine put a/c to max blower motor to hi open windows
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when freon reach enougt pressure the compressor should start and draw in
the freon if it fails to start you could jump the low pressure swich to help draw in
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cap off the valve
if compressor fail to start you have another issus could be electrical
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1989 Lincoln Towncar, Compressor Clutch will not engage


Make sure there is sufficient gas.

If there is gas in the system but it is not full enough the pressure switch will detect this and prevent the pump from engaging to prevent damage to the compressor.

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How to recharge recharge airconditioner


Hi, determine if your car uses R134 or R12 refrigerant. You will notice screw type connectors on the both the High Pressure Side and Low Pressure Side lines in models using R12 refrigerant. R134 compatible models have quick connect valves on both sides. Models made before 1995 may use the old R12 refrigerant. If this is the case, you must have your Chrysler's air conditioning system retrofitted to use R134 refrigerant. Mixing R12 and R134 refrigerants is dangerous and may cause damage to your vehicle. Check your air conditioning system pressure using an automotive air conditioning pressure gauge. Keep in mind that in order to get an accurate reading, the air conditioner has be turned on the coldest setting with maximum blowing power. Remove the Low Pressure Side port valve cap and set it aside. The location of the port varies, but it is usually in front of the engine block. Attach the refill hose to the port on the Low Pressure Side of the air conditioning system. The Low Pressure Side port is smaller the High Pressure Side port. Because the ports are different sizes, the refill kit hose should fit only on the Low Pressure Side port. Additionally, the High Pressure Side port will usually have a red cap or be marked with an H or the word High Allow the air conditioner to **** the refrigerant out of the can by slowly turning the valve on the refill kit hose. Pay attention to the way you hold the can. Most kits will have you hold the can upright when you recharge the air conditioning system. It may take as long as 10 minutes to empty a single can. Turn the valve to the off position and remove the refill hose from the port. Recap the port before closing the hood. Let the air conditioner stay on for at least 30 minutes. This allows the refrigerant to move throughout the entire system.
Take care

Aug 03, 2010 | 2006 Chrysler Town & Country

2 Answers

My recharging kit for air conditioner doesn't seem to fit recharge valve on 2004 dodge durango. How can I be sure i am looking at the low prerssure valve?


Newer vehicle come with R134 vs R12. Since the two are not compatible, R134 has larger fittings. AC system has two ports, High and Low. Low is return to AC Compressor and high is output. High port is first following line from compressor to condenser (condenser is at front of vehicle like a second radiator). Keep following line till you find high port (paint cap red). Second port is low (paint cap blue).

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2 Answers

How do I recharge the AC freon on my own?


You should have R12 freon in a 1990 but you can put R134 freon into that system the only problem your going to have is the adapter for R12 is different from R134 after you get the adapter you need to put the freon in the low pressure valve not the high pressure, you will know which one because the adapter only fits the low pressure valve which is located on your AC lines under your hood, theres a little cap thats either blue or black you unscrew. You can't buy r12 anymore because its not good for enviorment so buy R134. you can buy at any parts store for like $5 to $10.

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1 Answer

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Sounds about right. The switch itself is relatively cheap -$20-40, what you are paying for is the special handling that is required to remove R12, the labor to remove the switch, vacuuming and refilling the system.

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