Check the gasket of the top rear third brake light housing. Oddly this lets water accumulate below the passenger side carpet.

Check the brake lines, especially where they are hidden by the plastic fuel tank.

Check the fuel line from tank to EFI rail.

Do not be surprised if cracks in the brass arms of the OEM thermostat have cracked and allowed it to cock sideways and jam partially open.

If the antifreeze it not up to spec the stamped steel impellor of the coolant pump eats away.

If the top of the dash has been exposed to the sun for years it will crack quickly with new vibration.