well when I first got the 1999 323i it had a coolant leak in the upper thermostat hose and the lower heater hose. So I replaced everything but the heater core. But it doesn't seem to be circulating now that everything is back in. There are however no leaks, pressure is building up in the thermostat hoses is there a way to bleed the air from the system? because it certainly didn't take as much coolant compared to what came out during removal. There was neon green coolant before the removal process which is what I suspect lead to the premature failer. I have purchased blue BMW formula coolant, but didn't not put that in till I could get it flushed free of the green stuff. or does this matter?
I changed the water pump,radiator,thermostat and hoses. filled the over flow tank, but still not circulating?
You are right. You cannot mix the 2 coolants, and the %26quot;green%26quot; stuff probably DID cause a problem!! Look for the 2 hoses, 1/2 inch around, that go to your heater core. Remove them from their place of origin. Use a garden hose to flush through. Make sure your heater control valve is on maximum heat. I hope you got a water pump with a metal impeeler (made by HEPU) and not one with a plastic impeller. Should the impeller slip off the sahft, no circulation. Hopefully, you also cleaned the space between the radiator and the A/C condenser, where leaves and debris collect, inhibiting air flow around both. Check the smaller reservoir return hose for presence of a clog. Make sure all %26quot;green%26quot; stuff is out of the system. Also, use distilled water to mix with. Good Luck!!
I changed the water pump,radiator,thermostat and hoses. filled the over flow tank, but still not circulating?
sure thermostat not in backwards you remove car of radiator and crank motor to watch flow is what id say is problem it can go either way but only works one way it going spring down or rounded side up wouldnt matter what type of coolant as to being no flow and you can flush any time with a water hose and remove lower hose but id say thermosta not working or its in backwards
If you have a blockage built up, a thorough flush may clear it, but it is possible the cooling passages are air bound.
On many vehicles there is a small bypass hose between one end of the engine and the upper return hose going to the radiator. It may have a small bleed bolt/screw on top of a small tower connection. Bleed it with the engine running until you have coolant coming out...
if the thermostat is in backwards then it won,t circulate. the spring goes into the intake.it could be the radiator is stopped up or the heater core. if the thermostat is in right then start your car, leave the cap off so the bubbles can escape but after it starts to circulate you will have to add more anti-freeze and yes the greens stuff will do just fine.
