87 t-bird ac help

i have an 87 t-bird with automatic climate control. all electrical tests and pin point test of sensor control head and blower module show units are good.
have replace several of them anyhow. A/c clutch will not engage unless i jump the relay for cold engine lock out. Then the a/c clutch will not disengage. obviuosly a signal problem somewhere?? any thoughts.
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What happens when you jumper the low pressure switch at the accumulator (Fordspeak for receiver/dryer)?
walt peifer wrote:

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