Looking for the ac low pressure port for the 2002 mercury mountaineer

it will be in the larger pipe near the compressor or in the line at an accessible point.. The low pressure is the suction line from inside the car to the compressor.

4.0L , 5.0L : Back near the firewall (Evaporator) above the accumulator/drier. The line will be cold /low pressure port.
Near radiator (Condenser) is hot/high pressure port

Be careful, if unsure do not risk it. If the system is leaking this will be a very temporary fix and probably needs the service of an experienced auto AC person.

Mercury Mountaineer 2002 2005 Factory Service SHop repair manual Download


for better result download the pdf file

do you have the motor running and the ac on high ? if not do that ,, you'll see the pressure reading drop

sometimes it's in the fender well on the passenger sie. Just follow the big low pressure hose from the accumulator bottle and you should find it. If not let us know and I will look in trhe shop manual at work tomorrow.

if turns off or short cycling most likely needs a charge when low on freon low pressure safety will disconnect the compressor to protect it from damage

The low pressure ac port on my 2001 sable is located by the passenger side firewall.

Look for the receiver/dryer a tall "beer can" shaped device. It should be marked "LOW" or have a larger diameter pipe than the high side of the AC and fit the "self service" charging connect. Your manual has this listed as a "danger" item.

Two ports under hood for ac, use the one closest to the fire wall. Refill valve will only hook up to this one. Use a gauge on refill can so you dont over fill system and blow a o ring

the low port is between the engine and the radiator support and the high pressure port is by the cruise controll module