I cannot find the location for recharging the air conditioning for my2004 Mazda MPV. If has over 100000 miles and the air conditioning is running too hot. I found the + valve right in the front, but cannot locate the - valve where the guage will connect. Help!
+ and -? There is a low side of the system and a high side of the system. Unless you have the right equipment and know what you are doing, I really don't advise messing with it. You can not only get hurt but do a lot of damage to the system. Those kits they sell at the parts stores are death traps. If you overcharge the system, you could destroy the compressor and there is no way to know if it's overcharged.