1979 Chevrolet C70 Conversion to OEM Air Conditioning

[Nobighurry]

I'd be interested in details as well. Mine operates fine in high, but gets flakey when I go to low. But with my truck, when in low I'm going so slow, speedo is the least of my concerns...

[Airdirect]

This thread was to document my OEM A/C installation. Today I completed that task with the installation of a OEM radiator fan and clutch. I found a donor salvage truck with 4-53T that had the fan, clutch, and spacer intact. I feel very fortunate have found the OEM setup.

[Airdirect]

I have been having trouble with my 2-speed speedometer adapter not shifting when the axle is changed from low to high. I drilled out the four rivets and disassembled it. The lubricant was gummed up and sticky. I cleaned and re-oiled with 30W motor oil, installed pop rivets and presto, it works again. I should have taken pictures so folks would know how it works. Sorry I did not. It is very simple, just a set of planetary gears that are locked from rotating until power is applied. Once power is applied a electromagnet pulls against a spring to remove the locking tab and allows the planetary gears to rotate.

[Airdirect]

Ok fellow Heavy Haulers, I need help locating a correct fuel sending unit for my truck. I purchased a universal unit, adjusted it according to the instructions, it shows full regardless of fuel level. My original unit had become intermittent. I have confirmed the gauge works correctly, when the gauge sending unit wire is open, gauge shows full. When shorted to ground it show empty. I believe the universal unit I purchased works on different resistance values than the original. The original unit is 0 to 100 ohms. Below is a snapshot of the line build sheet, factory option list, and tank serial number tag. Any help would be appreciated.