Help... my car is overheating

[ghost88]

i have recently found out that my supra is very outside air temperature sensitive, for some reason it leaks a little rad fluid in the exhaust(about a half quart every 100 miles) when the air temp falls below 35 degrees. so i have to keep tabs on the coolant level. also you might want to check your resevoir, to see if it fluctuates, if its always the same or just going out and not going in then there is a system leak somewhere. not sure what else to look at besides the head gasket. hoses/water pump/ thermostat/ gaskets/ also i believe radiator cap pressure should be 13psi.