chriss929

Hey guys I own a 2007 Lexus GS350 (3rd gen). I had my motor completely rebuilt from top to bottom. Has about 3500 miles on it now. It’s got a new thermostat, radiator, radiator hose and cap, not a new water pump though. It recently started to over heat a bit though. I let it cool down and noticed it was low on coolant and checkef under the car and saw no leak. My reservoir tank got full to the top and it leaks it out now and I constantly have to be adding coolant now before driving. What can it be.

ibidu1

iTrader: (1)

Did you burb the cooling system to remove all the air of the system? You might have air in the cooling system

SILENTM

Did the head gaskets get replaced and the heads torqued properly. Are you adding coolant to the reservoir or thru the pressure cap above the water pump and is it the oem cap with the correct pressure