You have trapped air in the cooling circuit. Or your water pump may not be operational. Or you have blockage somewhere else in the cooling circuit. By the way...... Did you check and or replace the cooling system cap. You should test that cap once a year.
Some of these cooling systems can be tricky. They place BLEEDER VALVES at the high points in the cooling system. Allowing you to remove all the trapped air out of the closed loop cooling system. The cooling system has to have a certain amount of pressure for purposes of flow. That pressure should be less than the value stated on the cooling cap. Look for bleeder valves, - you will have to fill the vehicle with them open. And then Fill and bleed as the engine is running. When the engine is running you will crack the bleeder open until fluid comes out close it and repeat several times until all the air is removed from the system.
The fact that the system is building up pressure is not an indication that the pump is working. ( think steam engine) when the fluid approaches boiling temp the pressure increases. Please do not use just water to fill your system.
(A) It lowers the boiling temperature of the fluid and
(B) Promotes corrosion (oxidation) in the block and cooling circuit.
I hope this helps you......
I replaced the resouvier but not the cap where is the bleeder vavle? I see a smalll screw type on top of the resouvier is that the bleeder valve
Trace your coolant hoses from radiator to block. you should find little 8mm valves that look like brake bleeder valves. yes the one on the tank is one of them. check where coolant hoses go into the block and the aluminum housing where you replaced your thermostat.
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It appears that you have a minor leak at where a hose attaches to an engine or radiator pipe. When the engine is hot, any small leak will evaporate quickly and therefore not be seen. As the coolant heats up it will expand into the overflow tank but once the engine is stopped the extra heat build up will force the coolant out the leaking joint. As the engine cools, the leak prevents the coolant from being sucked back from the overflow tank.
Check all hoses and clamps including heater hoses and those pesky little bypass hoses in the cooling system for a good tight fit and replace any hoses that have gone hard or have become soft and stretched. Those spring type hose clamps tend to be less effective in clamping as the hoses age. Worm drive ones are the best to use.
If unsure take vehicle to a cooling system specialist and have them do a pressure test and more thorough diagnosis.
If problem persists, then it could indicate a problem with the head gasket (Usually caused by allowing engine to become excessively overheated when cooling system has run dry) allowing very hot high pressure combustion gases into the engine water jacket, which super heats the coolant in the engine block, which then boils off, and is released via the cap or any leaks. If the head gasket is really bad it will leak water into the cylinders and into the oil in the sump. This is indicated by an emulsion of water and oil mix on the dipstick. You will also see white smoke (water vapour) from the exhaust.
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