johny1

I have been looking for the low pressure valve but can't find it? Please help, thanks!

NGM

Like I say with all AC if you don't know don't mess with it. AC can hurt you quick.

johny1

I am just using the cans that come with a gauge sold in auto stores designed for the general public. I am following the instructions on the can and my manual instructiosn to just add some Freon.

torkum

The low pressure valve is #5 :

NGM

Whats the high side reading? Is the high side fluctuating? To do it the correct way take it to a shop and let them evacuate and re-charge it with the correct amount of freon. That way its not over or under filled. They can spot a problem before you can.

wde3477

First, not sure where the low pressure port is on your model, follow the hoses and look for a fitting with a cap. The R-134 systems have different sizes for the low and high pressure ports, so it's the next best thing to idiot-proof. Low-side will likely be on the passenger side of the engine compartment somewhere.

Now, I have the same concerns as user NGM - bad things can happen to you if you aren't sure of what you're doing. The $50-$100 saved will look pretty small if you end up with a permanent injury. Eye protection is a must, face and hand protection are strongly advised.

I like to encourage people who have the initiative to do-it-yourself, but this is an area that one should get some better training other than the couple of paragraphs of instructions on the back of a kit.

johny1

This is an awesome diagram - thanks a lot! Both caps on the high and low are black and it says nothing on them. Usually they are blue and red with stickers. I saw the one that you specify as the low pressure valve on the diagram but I expected it to be somewhere on the hose and be a blue color. Thanks again - I will wear all the protection I have - maybe my motorcylce helmet

NGM

Again I have to stress. Reading one side of the system is not the best indicator of a full or low system. Its only 100 bucks or so to have it done right.. Plus most of those DIY kits have leak stop in it. That will mess up a Ford AC system fast as hell. The runners in the condensor are tiny. Doesn't take much to plug them up.

johny1

The stop leak additive in the can is a very good point that I did not think of. Thanks, I may just take it to the dealer.

Dalej

Sorry to bother you, but i too need to add freon to my 1999 4.6l. could i ask what is valve #2 on diagram is this the high pressure line? thanks. Dalej