95 ESCORT AUTO TRANS NOT PUMPING FLUID TO COOLER LINES...

Instead of dropping the pan, I disconnect the cooling hose to the radiator and pump out 3-4 quarts of dirty fluid. This has worked fine on all my cars. Now, with a car I just bought, no fluid is pumping
out to the radiator. I did drop the pan and change the filter. The fluid was a very dark brown. Shifts in all gears, but car doesn't move under 1,500 RPM.
Has anyone had any experience working on/fixing transmissions who might offer suggestions? Thanks!
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Was the car warmed up when you tried this?
Ed
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Yes, it was warmed up. UPDATE: I got the fluid to pump out of the cooler line to radiator (into a plastic milk jug) by putting it in Drive and revving it up to around 3-4,000 RPM. When the fluid came out, it was so hot it melted a hole in the jug. I did this pump out/ refill 4 times unitl the fluid ran much cleaner, filled it back up, then drove it. Now, it won't move in OD but will in L. Once the car is moving in L, shifting to OD then it upshifts to 4th. The other day, it would take off in OD but not now ???
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You do realize, a normal trans will not let the engine rev that high unless the car is moving. The trans was slipping before ("doesn't move under 1500 RPM"), and sitting there revving it to 4000 just burned up whatever material was left on the clutches and bands inside. Have you saved up enough money for a new transmission?
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