Riddle me this on my 87 a/c.
I went to the pull-a-part solo today to pick up the rest of the AC system for the 87 2.9 Missing Linc. I got everything forward of the firewall, including all the wiring.
Very little is left under my hood, but I have this kind of evaporator coil:
Which may or may not be this one from rock auto
The in and out tubes on my existing coil are not centered, they’re together at the top of the air box.
The 88 in the scrapyard had this set up:
When I went, I knew they didn’t match, but I had looked around on the Internet and couldn’t find out why they were different. When I looked at Rockauto, just before I sent this, is when I realized the one in my truck is apparently dealer installed, and the bigger one with the long and short pipes on the top and the bottom is apparently what came from the factory.
Q1: Please correct me if I’m wrong in this thinking. I’m assuming I can use the compressor, all the hoses, the dryer (I’ll get a new one after I pressure test everything), etc. I don’t know if the new evaporator coil will fit into the air box I have, but it also looks like a pretty simple modification to just extend the air box into the engine compartment a little bit further.
It’s also obvious to me now, that the little bit of remaining wiring was hand-done, and not factory. So…
Q2: if I connect the wires correctly from the firewall forward, won’t the whole thing work from the existing control in the dashboard? That control looks exactly like all the truck trucks with the factory air.
I’m hoping I don’t have to replace the whole blower/air box assembly, especially since I cut the one up that I pulled all this stuff from, but there are always a few of them around down here.
What landmines am I about to step on?
Btw, I also got a pair of the pop out windows for the 97 Road Ranger for $35 for the pair, some trim pieces & a seatbelt for
@Peter_'86_2.9L_Auto ’s 86, a cottage cheese cup full of nuts, bolts and screws, and an extra starter solenoid. Probably some other little stuff I don’t remember.
EDIT: more info.
The front of the existing air box in the 87 is like a big cap about the size of a carton of cigarettes, and it comes off with three screws down either side, pulls forward from the main part of the box. The note on the rockauto site said “dealer installed.” That has to be right, because I can’t believe any of the Ford engineers would’ve ever designed something that practical and easy to work on!
Apparently, if I pull those six screws, the end of the box will come off, and just from my tape measure, the replacement coil will just slide right in there. I just have to re-drill the lower hole for the pipe from the new coil.
Q3: there’s a relay with a liquid filled probe, looks like an old-fashioned thermostat/temperature probe to me, that sits on top of the air box, and the probe disappears down into the air box on the cold air downstream side. I’m thinking that it is to turn off the compressor if there’s “no cold,” and it’s an early version of the low pressure switch we have now, which the 88 in the scrapyard had as part of the drier assembly. Yes/no? Connect those wires to the pressure switch?