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Welcome, I'm Chris (aka Moose), my normal schedule online is around lunch and after dinner past midnight.
Do you own a pressure gauge to check the pressure?
Monitoring the cooler flow is not a form of diagnosing unless your trans oil has an overheating concern. Cooler flow is regulated by a thermostat.
In the event pressure is low slipping would be a minimal concern because low pressure would result in it slipping horribly or not even engaging. Also in the event pressure is low, the damage to the clutches and bands is already done meaning you now have a cause and result to address. Based on it slipping I believe overhaul is inevitable at at the least including diagnostics to see if pump line pressure is low.
Thanks for using Just Answer, and rating me so I am compensated, Chris
Hello again Chris here,
Do you have a scan tool to check the trans fluid temp?
Do you have a pressure gauge to check the line pressure?
I can diagnose this based on it not having line pressure and not knowing the fluid temp via special tool checking. However the diag may be wrong since we are basing it on a test not outlined in the repair guides as needing to perform to get to the next steps.
So do you want to continue forward on the diag based on assuming its loosing line pressure?
Based on the pressure test, low line pressure means the pump is worn out or the pressure regulator are the most likely failures.