over heating and coolant loss

[disturbdgt]

So ive replaced my thermostat and my fan is working, but somehow the car still overheats.i filled up the overflow tank today anf deove it for like 5 minutes and went inside and let the car sit and went back outside to check the coolant only to find coolant missing. What could be causing this? Theres no coolant in my oil. But I looked at the thermostat housing and on rhe aluminum crossover on the intake manifold there is like gunked up green, could this be coolant and why im overheating and loosing coolant. so im pretty sure it is leaking from the aluminum crossover where the gasket is right under the the thermostat housing. could this be my problem to my overheating issues? and if so do i need to get a new intake manifold. Thanks in advance for help

 

[darkside03gt]

That buildup sounds to be coolant. Did you replace the gasket when you replaced the T stat?

Why did you replace the T stat?

Was the car over heating before but not loosing coolant?

Did you burb the system with the car idling?

Does your exhaust smell like coolant? If so then a head gasket may have went south on you.

The more info you put out there the more we can help you figure this out.

 

[disturbdgt]

well it was orignally overheating so i replaced the thermostat and gasket, and it still over heats with a new thermostat. and today i only drove it for like 5 minutes and the temp gauge was just below half. i let the car sit for a while and then went and checked on it and the resivoir was between half way and a 1/4 way full. i put 2 gallons of coolant in it today before i drove it. and no exhaust smell

 

[Maxpowers]

Answer all the questions darkside posted.

How did you fill the coolant system.

Normally a thermo gets stuck open causing the car to run cool. Who told you to change it?