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I know the 66 olds has a thermal relay that will shut the system down replaced one on my friends last year . his top would start up and shut off let it sit hit the switch again and would move again .His was located on the firewall drivers side close to the fuse block connections
your top motor pump could need a cleaning . they can get build up sludge in them condensation . it is a very simple motor pump . put down a cookie sheet tray when you take it apart the only real part you have to be careful about loosing is the ball at the end of the shaft that is used for a bearing GM pumps are pretty much the same 64 - 72 switched from 4 legs to 3 legs in 67
we use clear power steering fluid in our systems . we currently have 4 verts two 64 GTOs a 67 GTO and a 91 cutlass
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