Yup. IMO Thermostat opening should be highest point. Make sure to also use the turbo coolant tank plug too. Add coolant through thermostat opening until that tank is full to bottom of threads. Put plug back in. Continue to add coolant through thermostat opening. Front end above rear end by 2 feet. Really helps to take thermostat out and drill a tiny hole (3/32")in flat base part of it to allow air to escape prior to thermostat even opening. Hole won't affect running temp. Also tiny hole enusre there is always a little coolant circulation no matter what.