there is a problem with yours, undercharged or overcharged, nissan air usually is one of the colder ones out there... Nissan uses a pretty heavy duty fan clutch to pull air through the radiator /condensor assy and its usually all thats needed, if you replace the fan clutch use the nissan factory one as the aftermarket hayden/torquo/imperial all seem to be crap compared to the oe.

Back on your original a/c question, R134 systems switched a/c hoses to a type of rubber hoses called barrier hoses which the molecules of r134a couldn't pass through as easily as they can on r12 hose, all replacement hoses now are barrier hoses.
Alot of a/c people theorize that the older r12 hoses were so saturated internally with mineral oil that the leakage rate for r134a wasn't any worse than the original r12 ( 4 ounces per year on most systems is considered normal) I haven't seen that to be the case though but feeding a car a can of 134a each year is a whole lot cheaper than changing all the hoses and seals.



Quote Originally Posted by John B. View Post
I ended up replacing everything last week & now have ice cold air just in time for the July heat! A new water control valve & a fix for the broken dash vent cable sheath retainer clip were the only other issues I had to deal with. Lots of crap blocking air flow through the old evaporator so I now have much better air flow into the car. I'll check for leaks again in 4-5 days but I'm hoping this is the end of my A/C issues.

Speaking of A/C I was looking over the set up on our 2002 Frontier yesterday trying to figure out why the A/C sucks so bad in town. Turns out they don't use an aux fan on the condenser which I would have thought was standard on all a/c systems. Is this a typical Japanese set up or did Nissan just cheap out?