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1973 C10 "The Purple Truck"

Basic build
Overview Gallery Discussion
You need airflow through the condenser to keep the pressure down. If you are able to install a pressure switch to trigger the fans over a set pressure, it would work and not run the fans while running down the road. It may be easier to just turn them on with the A/C.
 
Is the AC clutch triggered with a 12V signal or ground? You could connect the AC clutch trigger to the fan relay trigger and put a diode in between, so when you turn on the AC it turns the fans on, but when you turn the fans on the AC doesn't turn on.
 
The Derale controller actually has a trigger wire to use with AC; it will turn them on at 60% power. I chose the option to trigger with a switch instead, so I need to change that. I had never heard about the pressure issue. Probably me that cause the compressor to fail then. :doah:
 
I wired the Derale fan controller to turn the fans on with the AC. I didn't know until the shop that did the AC charge told me you need some air flow anytime the AC is running. Fortunately the controller has an AC override option.

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This is one of those times I'm glad I invested in the Delphi Packard 56 terminals so I can run wiring with factory style connectors. I just added a brown wire from the factory green & white wire that provides power to the AC system in the engine by. Crimp a new terminal onto the 2 wires and snap back in the original holder.

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Now the fans come on at 60% power any time the AC is turned on.
 
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Where does that Derale controller get its temperature signal from? It is in in the radiator fins or the actual coolant temp?
 
It has a sensor that's taped to the radiator tank as close to the outlet as you can get it. Yes, the outlet. They're very specific about that.
 
Well with the EFI you will have the option to control the fans with the ECU fan output to the relay based on engine coolant temperature if you prefer.
 
Installed the Oxygen Sensor Bung today. I ordered a new welding helmet just for this project and like seems to be a common occurrence these days, it's delayed in shipping. I didn't want to put off the swap any longer, so I used the Mayflower helmet. It's some of the worst welding I've done so I'm not posting a picture that shows the welds. It doesn't leak, so I'm gonna run it.

It's on the pipe coming off the passenger manifold.

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Did this at the business shop. Going to do the swap in the garage at home. Don't have a welder at home so that's why I wanted to do this first.
 
No, I've done a couple of things on the 73 there; the timing chain and rear axle seals. It fits just right in there. The crew cab could fit but you wouldn't be able to walk around it.

I was reading over the ProFlo instructions this morning and discovered I may have messed up. It says not to drive with the O² sensor unplugged or it will be damaged. The underline is from the instructions.

Not sure I understand how it could be damaged. I only drove about 15 miles so I'm hoping it's okay.
 
Realized there's another fly in the ointment. The AC compressor bracket won't work with the ProFlo... :doah:

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Hopefully I can remake the bracket to work under the manifold bolts. If not, I just wasted a bunch of money on the new compressor.
 
There has got to be a way to modify the bracket to keep the AC I would think. It will be tricky with the fuel rails.
 
After doing some searching I found that several people have just removed the rear bracket and ran it. This is an issue that comes up because of running tall valve covers. The consensus seems to be it'll be fine as long as the lower support is there, which I do have on mine. It's kind of a cool bracket actually.

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I'm feeling like it'll be okay with it because I have that new lighter aluminum compressor. I'll hang on to the bracket in case I want to add it back on later. I may keep an eye out in the junkyards to see if I can find one to sacrifice so I keep an original unmolested version around.
 
mrk5 said:
I ordered the newer, larger hose from Amazon and I'll have it tomorrow; this next day delivery stuff is new around here.

I was looking at my 89 crew cab this morning and the 3 screws that hold the metal filler neck to the bed side are the same pattern as the 73. So I'm thinking I could bolt a newer filler neck in my older truck. The only thing I didn't measure is if there's a difference in how far out the the metal protrusion is from the flange that mounts it to the bed; hopefully that's about the same. Catch is I don't have an extra new style filler neck and based on my last trip to the junkyard, it's doubtful I'll find one there. I can get a new one from LMC for $60; I'd rather not spend that if I can help it.

The other option is I think I might be able to fit the larger hose over the smaller hose. Basically use the small hose as an adapter for the large hose like I've seen done with radiator hose. It should work okay because of the direction of flow. If I was trying to go the other way around I don't think it would work without leaking.

I wouldn't mind trying the new style metal part because the 73 always over fills and spills gas if I let the pump stop with the automatic shutoff. I have to lean down and listen for when to shut the pump off manually. I've often wondered if that would stop happening with the new style filler neck.
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I believe that the problem with gas spewing out has more to do with the angle of the cap flange and the end of the filler neck. The '73 has no fuel door and the neck is about level. Look at your '89 and how it is pointed upwards.
Just my thought.
 
6872xtc said:
I believe that the problem with gas spewing out has more to do with the angle of the cap flange and the end of the filler neck. The '73 has no fuel door and the neck is about level. Look at your '89 and how it is pointed upwards.
Just my thought.
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You are right about the 89. I was just out looking at it and noted the filler hose is angled down. I was wondering if the fuel filler is higher up the fender. It's a little hard to tell because the 89 is so tall and the 73 is short.

skunked said:
@mrk5 I have a few different filler necks if you need one.
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I may take you up on that. I'll let you know after I mess with it this weekend. I was thinking about all the filler necks that have passed thru my hands on various parts trucks and now I wish I'd kept just one. :doah: :rotfl:
 
Measure from the top of the bed rail.
:D

Sounds like you might want to do some body modifications!
:waytogo:
 
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