Took the son's 68 to have the AC charged for the first time since the resto.
Systems Specs are:
-302 4v(rebuilt +.030 with about 5k miles)
-Orig recored radiator
-Spal 16" curved high performance electric fan,puller, 2000+ cfm, on 165 degree sensor in bottom hose.
-New 6 circut condenser form Classic Auto Air(CAA)
Orig Drier rebuilt by CAA(since ALL the repo units do not have the front fitting in the right location on the top of the drier).
-New hoses from CAA
-Orig Expansion valve, cleaned out(not yet wrapped in cork tape so might get a little heat from the shorty headders, Heddman ceramic coated.
-Sanden 134a compressor filled with freash correct oil, was on my dad's '34 cabriolet until he decided to remove the AC about 7 years ago(it was stored with hose connections capped in a safe place).
-Orig evaporator, cleaned out with brake cleaner & air.
Went like this:
-It was about 80 degrees outside.
-Called Classic Auto Air to get specs on amount of 134A the system holds.
-Evacuacted system and charged system with 22oz per specs.
-Started car and after about 20-30 seconds the high pressure gauge went up to 400psi.
-Low side was about 40psi.
-Mechanic said sut it down.
-Called CAA they said high side should be about 300psi or a little less.
-Evac system again and charged with only 16oz.
-Evacuacted it all back out.
-Went back by this week and talked to another guy in the shop that years ago did a lot of AC retrofits into all kinds of cars. He had helped me retro fit a system into '71 Volvo a looooong time ago. Old high school friend too, he was on vacation the first time.
-He asked if the radiator fan(elec.) was running when the AC system was turned on?
-No it wasn't it is set to come on based on the temp switch in the lower hose.
-He said that is porbably it, that the fan needs to run all the time when the AC is on to cool the condenser or it will get hot that fast and make the pressure too high.
Is this right?
Seems like a waste to have the fan running all the time when the AC is on. Especially at highway speeds when it should not be needed.
If so that means I need to worry about the daughter's 66 that runs a factory AC with Sanden 134A conversion and the same electric fan setup as her brother.
'68 J code coupe back in H.S.1st car. Now 65 GTFB
Daughter & I built her a '66 coupe feature car in 8/04 MM & '05 Meguiar's winner see it @ Meguiars.com
Just finished on oldest son's '68 j code coupe
'67 FB project is next with/for youngest son
'92 5.0 LX vert 68k org miles
'74 TR6 Project for Wife