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Permanent air lock means your system has leak sum were or your reserve tank and radiator cup not function propebly full radiator fit cup Rev engine up to 1500to 2000 few times stop engine and top up sum time take 10 times.
check radiator is not blocked, check air can pass through radiator (fins not blocked with debris) check that there is no airlock in system. is header tank being pressurised when engine running ( remove cap and start engine, look for bubbles in header tank). If bubbles then you need to check head gasket or even crack in head or cylinder walls. Presume you fitted the thermostat in the right way round. if you have boiled the engine since fitting the thermostat you will probably need to remove it (maybe see if it boils without it fitted) and possibly replace it again. (drop in hot water and see if it opens, if it doesn't then replace it)
Check your temp sender in case its faulty, but if the enging feels that hot then its could be a number of things. Start with a possibly blocked radiator, or it could be a blown head gasket (is the water system getting pressurised? remove filler cap WHEN COLD and start engine, if it blows the water out or you see bubbles then its a gasket. It could also be that the system is just airlocked (having the header bottle (if fitted) higher than the engine when filling should maybe sort that, also check your heater pipes for bleed scews (fitted if airlocks are a problem on some cars) or maybe youve fitted the thermostat upside down, (check direction of flow). Personally I would go for either an airlocked system or a wrongly fitted thermostat.
You could have an airlock still in the system. Run the vehicle at idle and squeeze the top and bottom radiator hoses with the expansion bottle cap removed. Add fluid gradually to it keeping it under the full marker. The bubbling is super hot air caused by air trapped either in the engine block, or top of radiator. A little tip while doing this, have the heaters on in the car and on high heat with the fans running at high speed. If you notice the engine getting warm and the heating in the car stays cold, the airlock is going to need a bit more work. Eventually if you have replaced the head gasket correctly the air lock with come out.
Hope this helped...
first check to see if your heater hoses are getting warm you may just have a bad thermostat, if you've had any recent work done to the cooling system you may have an airlock which does not allow any coolant too flow through the heater core. do you smell antifeeze ?
its prob not airlocked but plugged , your going too have too turn off the supply and open a line on the downhill side , and drain it then open the supply line , and flush it out,!!!!
in other words disconect both lines from the raidiator, and flush it out till you get a steady flow of water on both sides!!!
Your overheating problems can have several possible causes. 1) Airlock in heating system - solution - bleed air from cooling system.
2) Radiator blocked - solution - drain and flush radiator 3) Failed waterpump - solution - fit new waterpump 4) Engine thermostat stuck in closed position - solution - fit new thermostat 5) Electric cooling fan (if fitted) failing to operate - solution - check fan, fan operating switch, all wiring and connectors 6) Not enough coolant in system - solution - check and top up to required level. Also check all hoses for sign of leakage. 7) Faulty temperature gauge giving incorrect reading.
Should be located in a removable housing at the engine end of the upper radiator hose Drain about 1 gallon of coolant from the radiator Remove this housing Note how thermostat is installed Clean both surfaces Replace thermostat and gasket Re-install housing Re-fill coolant slowly to prevent an airlock Start engine and look for leaks Run engine to normal operating temperature with heater on Check coolant level
your completely right mate about most conventional heating systems are open vented unless its a pressurised system..im a plumber and had at least 4 chrome towel rail rads that this has happened with,its a manufacures problem not yours,
send it back