coolant dissapears then reapears in 2001 v70xc

[baldyjones]

When cold, my reservoir coolant level is at max line. after the car warms up for a while (1 hour, the temp gauge never goes over the 1/2 way mark at 12o'clock),and the low coolant warning comes on. The coolant has just gone DOWN to the min line. If I rest it for a moment and slowly let the pressure out of the tank the coolant rises back up to max.I tried overfilling the tank temporarily to cover the top 5/8" hose and there are bubbles coming out of that hose. What does it all mean. Am I looking for a leaking head gasket causing extra pressure? No smoke out of tail pipe... no residue in coolant , no mud in oil...I haven't done a compression check or leak down test. A friend told me to stop worring and let the thing bleed out alll the air???

[howardc64]

Was the coolant changed recently? Air will bleed out pretty quick after coolant change in my experience with this car. Need to top off within a few blocks and then all is done.

Is the temp gauge always at about 12 o'clock when warm? I think just a tad left of 12 o'clock from the cars I've seen. Thats where the temp needs to be on this car. If the gauge is lower than that, something is wrong. I had a temp gauge that showed about 2/3 way to 12 o'clock and turned out to be a bad thermostat.

Oh, thermostat is a cheap ($10+ online) and easy change on the 01s. You might try that. Indys replace that thermostat at 30k tuneups since the 850s.

[mrjacobrusselll]

When cold, my reservoir coolant level is at max line. after the car warms up for a while (1 hour, the temp gauge never goes over the 1/2 way mark at 12o'clock),and the low coolant warning comes on. The coolant has just gone DOWN to the min line. If I rest it for a moment and slowly let the pressure out of the tank the coolant rises back up to max.I tried overfilling the tank temporarily to cover the top 5/8" hose and there are bubbles coming out of that hose. What does it all mean. Am I looking for a leaking head gasket causing extra pressure? No smoke out of tail pipe... no residue in coolant , no mud in oil...I haven't done a compression check or leak down test. A friend told me to stop worring and let the thing bleed out alll the air???

Sorry, you have a head gasket leaking air into the cooling system. It will press air into the cooling system forcing the water down in the overflow tank.

Time for a head gasket job.

[ifnt420]

Have you checked the heater core inside the cabin? is your carpet wet on the passenger side?