99 ply voyager transmission problems

I am looking for any input on the transmission in my 99 voyager (68000
miles) with a 2.4L Inline 4, 3 speed engine. The gears started acting
up, i took it in for a radiator and transmission flush. They pulled
the trans dipstick and it was a milky pink color. Opened the
radiator-same milky pink color. they said that moisutre was getting
in somewhere-no leaks found. They said it looked like radiator was
cracked. Took it it to get fixed-new radiator (was cracked) and both
coolent and trans flushed 2x. A few days later trans started acting
up. opened hood, pulled trans dipstick out, back to cloudy color.
Opened the plastic coolent container-very dirty. opened actual
radiator-was green and clean but noticed dots of red trans fluid
floating. Neigbor had me turn on van and run and he told me that it
coolent wasnt turning like is should. Any help or in put-the radiator
and flushes where done by a mechanic friend of a friend and dont want
to go back to them but dont want to get taken for a ride either.

 

Most automatic transmissions circulate oil through a pipe in the bottom
of the radiator to cool the oil. It sounds like this could have a leak
inside the radiator allowing the transmission fluid and water to mix.
This should not be too hard to test by disconnecting the the
transmission oil connections and pressurizing the oil pipe in the
radiator. If bubbles appear in the water, then you need to replace the
radiator and flush the transmission again.

Until the engine is hot enough to open the thermostat, not much water
flows in the radiator. When it is that hot, the water in the radiator
and engine can flash into steam and cause serious injury.

My guess is about $350-$450 at a shop for a reconditioned radiator and
transmission flush. Dealer service or new radiator will cost more. In
my opinion, this could only be a defect.
Good luck