I did my coolant change about 2 months ago, then yesterday I did some rigorous mountain driving, then noticed that engine temperature gauge was very close to the C zone.

I checked the coolant level and noticed there was almost no coolant left in the reservoir.

Whats going on? I'm pretty sure its not leaking or anything. So where did all my coolant go?

 

could be a headgasket leak, it evaporates from the heat and leaves no residue

 

Check your other fluids...ATF, check your oil. Could be a leak somewhere there or a headgasket leak....

 

How about coolant in the radiator? If you're LUCKY, the only thing that happened is you had air bubbles that have finally made their way out to the reservoir. Then the radiator sucks coolant back in & your reservoir level drops.

But you ought to do a pressure check just to make sure you don't actually have a leak.

 

A very common leak for the G3 Integra is the top radiator seal.

Could be that the thermostat failed? :dunno:

 

yea so I refilled coolant to the max level in the reservoir yesterday, and the radiator definitely sucked in more coolant after the car ran for a day.

The engine temperature gauge is still does not go all the way it did before to the mid C to H range. But I feel safe now knowing my car has plenty of coolant.

Hopefully everything is okay?

 

possible pin hole leak in radiator

My '92 Teg mysteriously lost coolant on several occasions. Replaced radiator and problem is gone.

 

Have you opened your radiator cap to be sure that it really DOES have coolant??

It's entirely possible that there's still lots of air in the radiator. Just refilling the overflow reservoir & hoping it gets sucked in is a dangerous way of bleeding out the air bubbles.

When it's cold, squeeze the radiator hoses. You should only hear the rattling of that little pin/vent in the thermostat. If there's air you'll hear it sloshing.

 

Top radiator seal, same things happening to me except im getting huge air bubbles too

 

alrite I'll try that. Do I do that with the engine on or off?

The radiator cap has to be off when I do this, right?