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    1978 drier location

    I am trying to get my 1978 c25 ac back up and running. The system was all closed up but the po said the main hose was leaking. I ordered a new line and drier on rock auto. The drier that I got doesn't appear to be on my truck? It looks like a normal drier canister with fittings on top. I...
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    AC/heat blower motor only blows low

    Im starting the process into getting my Heater and AC working in my 78 C25 GMC. When I turn the blower on it only blows very lightly no matter where I put the switch. Can anyone tell me what I need to check to see whats going on? The guy I bought it from said the ac works but the line has a...
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    How much fluid is in a 350 block?

    Ive been working on the temp sending units and such on my 78 C20. The coolant ive drained out has been pretty brown and dirty. Before I put a thermostat back in I thought it would be a good idea to run water through the block and drain it out several times until I get cleaner water. When I...
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    Temp gauge/sending unit issues

    I've got a 78 gmc that I just picked up with a 350 that must be from another year. The temp gauge isn't working and I'm having trouble finding a sending unit. I can ground the wire and the gauge will go crazy and finally peg out way past hot. I bought a sending unit for a 78 and it's threads...
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    1978 350 temp sensors and vacuum lines.

    How many temp sensors should my 78 350 have? I can only find one wire but I have a sensor down by the drivers side spark plugs and my thermostat housing has 2 sensors in it. One button head sensor and one plug in sensor. Also, right beside the thermostat housing I have a vacuum tree that...
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    help with an oil leak

    Ive got a problem with an oil leak and need some help. Saturday I purchased a 78 GMC 3/4 with a 350. This motor was "supposedly" rebuilt in 2000 and parked in 2002 when the old man passed until last year sometime. We drove it 65 miles on Saturday morning with no issues. On Sunday I made the...
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    Edelbrock clearance issues. (or go back to quadrajet)

    Hi, First post on the forum! The search function is not passing my work filters for some reason but I did try that first! This past weekend I purchased a 1978 GMC 3/4 ton Royal Sierra. I was checking the air filter when I got home and noticed that the PO had switched the quadrajet carb to an...

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