Got the belly pans off.

Poured water in the reservoir. Water ran out a few drops on the driver side of the torque converter but most ran down the driver side of the transmission near the front end of the oil pan. So I assume this means heater core or hoses leading to heater core. How do I access this area? Is this likely the source of my overheating issue or just the collateral damage? Any test I can run with a reasonable amount of labor?

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My Daily : 96 E-300 Diesel with 195,000 miles
Retired: 92 300D 2.5 T 345K miles and for sale
Retired: 95 E320 157K miles and currently parked with blown engine

Both retired cars are for sale as is my w124 shop inventory

After more research I want to:

Inspect hoses to and from the washer fluid,
Get access to the behind the firewall by removing the drain pans and wiper etc.

Likely the leak is coming from a low point in the system based on what I have observed. It is big.

__________________
My Daily : 96 E-300 Diesel with 195,000 miles
Retired: 92 300D 2.5 T 345K miles and for sale
Retired: 95 E320 157K miles and currently parked with blown engine

Both retired cars are for sale as is my w124 shop inventory