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my original base 350 automatic w/ac didn't have them. The SB 4 speeds had the expansion tanks in the early 70's and the only valve I've seen is also in a SB 4 spd, non ac car.
 

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Discussion Starter #22
my original base 350 automatic w/ac didn't have them. The SB 4 speeds had the expansion tanks in the early 70's and the only valve I've seen is also in a SB 4 spd, non ac car.
This seems to be what I'm hearing as well. So...I don't quite understand how the A/C works with the heater core full of hot water all the time???
 

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AC cars have the cut off valve, depending on model year. Non-AC usually do not have one.

You can add one. You can also purchase rubber caps which allow you to remove the hoses and cap off the lines on the engine.

:thumbsup:
new here! but where would you recommend to purchase rubber caps?
 
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