When I bought my 87 vert it was already converted. It had a junk yard S-10 compressor which leaked. I replaced the compressor with a new everco unit, dryer, and a Ford light blue orifice tube. I also flushed the system. I have 2 issues. I am getting around 52 degrees out the vents on a 90 plus degree day with good pressures 40 low and 245 high at idle. However I noticed the more I drive it the the warmed it gets. The compressor still runs, no cycling that I can tell. It seems that the fan is pushing less volume through the vents. The blower motor is still running, and I have it on 10. It will warm up to around 68 degrees. The second issue is that no matter what setting I am on air will blow out the defrost. On auto it splits between the vent and dash. On heat it will split between floor and dash. I have no vacuum leaks confirmed with a smoke machine. I guess the defrost door actuator is bad. Any advice would be great, thanks.
Mine is the same in almost every way....yr, symptoms etc...
I have a big fan directly on the condensor to help keep it cool. Some help, not enough.
My vents all work but I have noticed the vent air sometimes for no good reason, go somewhere besides the dash vents even when set to 60-auto fan-10. I hear the air flow change but have no idea whats going on.It aways comes back after a few seconds, at idle, freeway or whatever.
I DO know that the hotter the engine gets the less efficient the a/c gets.I am buying a new radiator from the link that another member posted in another recent thread here regarding a/c issues. That member had very favorable results for the engine temp, so hopefully I will as well. In my efforts to manage engine temps and a/c efficiency I even by-passed the heater core to see if the hot air was contaminating the fresh cold air...not the problem.
The only thing that I can see is an old condensor thats got lots of dirt particles or sand grains embedded in the veins. I'm sure that reduces the condensors efficiency, so a replacement is planned. One other thing, I charged with the "
ultra-synthetic" 134a and it seems to get cool faster but like yours the longer it runs the warmer it gets and my old compressor in the exact same system with plain 134a cooled much better, so thats going to get changed as well.
I will look for the defrost actuator in the service manual and let you know the process to change it. It can be seen if you take the dash pad off and you can check its operation visually by observing as you change a/c settings. I think with any a/c setting for cold thru the front vents, some air is directed to the lower or floor vents as well. heater, vent/fresh air splits between front and defrost. I do not think there is a setting that allows all the flow to go to any one set of vents.
I am told that the evaporator tends to get semi plugged from decaying foam insulation in the box and dirt/dust thats managed to find its way inside thru the air intake vents at the windshield wiper area. I have no idea what to do about that other than disassembly to clean and I hear heater core swaps are a PITA. Maybe a good vac or somehow getting a strong flow with steam in the reverse direction? I dunno how to solve the problem of a dirty evaporator core.
Hope this helps.
