AC question?

[Just a Six?]

So 2 AC issues on my 87 LTD


#1 about a month ago a very hot day I'm driving in heavy traffic for a couple hours (rush hour to-from airport) & my still stock Ice Cold R-12 filled system is blowing great. At about the 2 hour mark I Assume a Vacuum Hose starts to collapse because the fan is blowing fine but the vents aren't opening enough to allow the air flow out them? I try switching from Defrost-Heat-Vents-On-Off etc & fan is on High blowing great but almost no air flow?
I get home pop the hood & don't notice any messed up hoses? I leave it a few days & turn it back on & all is fine & still is fine during a 2 hour hiway drive & again a very Hot day air is Ice Cold.
Altho I do remember on a Long Drive last year the same thing happened?
Any ideas where to look because there is nothing obvious under hood I can see?


#2 On the drive out to the show this weekend about 30 mins in the guys are telling me my AC drip line behind passenger front tire is spewing out water on the hiway as I drive. Does this for a couple mins then stops. Figure maybe it got clogged & blew it out but that's a Lot of water? All is normal since.
One thing I noticed just prior to that I got One Puff of dense air vapor come out the centre vent. That was it.
Air is still Ice Cold & no issues? Any idea's because I hate chasing Gremlins! Thanks! 

[Steve Wood]

was it blowing cold air out on the floor thru the heater ducts?

Was it a humid day when it was putting a lot of water out...usually does that when the air is wet and the ac is working well....or it could have had the drain plugged up and then it came open.

[Scoobum]

Call Norbs. Most don't know it...but he's an AC specialist.

[daveismissing]

Maybe you are a bit low on refrigerant and frosting up the coils

[Just a Six?]

It was really Hot that day & pretty humid as we had Thunderstorms that night & next morning.
The air was trying to get out the heater floor vents but very restricted.
At least it's good the first 2 hours & I rarely drive much farther than that.

I will check if it's low & if not maybe I'll see if Norbs wants to come out & have a look.

[aminga]

Maybe you are a bit low on refrigerant and frosting up the coils

That is my guess. 

[Just a Six?]

One of the locals is an AC guy & has a new recovery tank that will be just for R-12 (so all the locals can get in on it) & I have an extra can of R-12 to top it up so after we take readings etc. I have a polished accumulator been on my shelf for years so time to do the swap. Finally check it off my list of "some day" stuff.