I think i have a air lock in the water sytem on my bmw 520i,
The rad gets warm at the top aand is cold at the bottom.
the pipes get hot and the rad is cold.
no warm air blowing in the car using the fan and it is only bowing cold.
i do hope you can hep me with this.
a 6ya Mechanic can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repair professionals here in the US. click here to Talk to a Mechanic (only for users in the US for now) and get all the help you need. Goodluck!
- If you need clarification, ask it in the comment box above.
- Better answers use proper spelling and grammar.
- Provide details, support with references or personal experience.
Tell us some more! Your answer needs to include more details to help people.You can't post answers that contain an email address.Please enter a valid email address.The email address entered is already associated to an account.Login to postPlease use English characters only.
Tip: The max point reward for answering a question is 15.
Loosen the cap on the rad and run the engine up to operating temperature. Make sure the rad is full, and go for a short drive around the block to warm up the engine. Make sure the heater is turned on high and the fan running full. There will likely be some burping and gurgling going on as the air gets forced out. Keep checking and topping up the rad. Eventually it will stop.You should run it for acouple days with the cap loose to be sure all the air is out. After that, make sure the rad is full, close the cap and top up the overflow bucket.
While it doesn't seem likely, if you've changed, or had the thermostat changed.... I'd say you got a faulty thermostat. I am curious as to what your temperature gauge says the temperature of the engine and coolant is.. If your gauge is showing hot, I can think of two more possibilities... the water pump isn't pumping right... and, if the water pump isn't working right, the problem can be a cracked head or block, which can cause an airlock in the coolant system. Check the coolant or radiator cap.
if its not overheating your water is circulating and working normally
your heater core or rad could be airlocked open a top heater hose and fill slowly making sure no air in system run for a while then top up can take a while to clear the air
also make sure heater valve is operating
check hot water is circulating through heater rad by feeling the inlet and outlet pipes as they come thru the bulkhead if ok it sounds like there is a control panel prob, if hot water isnt circulating make sure cooling system is bled properly, and you could try backflushing the system.
hi, the most obvious cause of no heat coming through the heater vents is going to be that the thermostat has gone and will need replacing these are cheap to buy and not to hard to fit.
Now the other problem you could have would be with the heater controls the control that chooses hot or cold air may have packed up and may need replacing the best way of finding out it the thermostat has stuck shut is to feel the top and bottom of the rad when the engine is nearly up to temp dont burn yourself just give the rad a feel at the top and bottom and see if the heat is even all around the rad.
If you look at the two pipes going through the center of the bulk head towards the middle these two pipes go to your heater rad matrix now if only one of these is warm and the other cold then this means thermostat gone if how ever all the pipes are hot and the rad is hot all over then this would point to the heter controls being at fault.
Now if your heater controls are cable one of these may have broke and you would see this once you have the cover off the controls if how ever yours is electronic then the chances are you wont be able to tell if its working or not.
I myself would go with the thermostat first as this is the cheapest and easiest part to change.
Let me know how you get on or if you need further assistance ok
NORMALY THE HOT FLOW ENTERS THE TOP HOSE AND COOLER WATER LEAVE THE BOTTOM HOSE BACK TO THE BLOCK, SO IF THE TOP HOSE GETS WARM THEN THE RAD IS BLOCKED , IF NIETHER GETS WARM/HOT THEN THERMOSTAT NOT WORKING, OR YOU HAVE BLOCKAGE ELSE WHERE, SO REMOVE BOTH HOSES FLUSH RAD WITH HOSE PIPE, (WHEN ENGINE IS COLD) SEE IF WATER FLOWS OUT AT SAME SPEED AS U R FILLING IT, IF NOT ITS BLOCKED, 2ND REMOVE THERMOSTAT AND FLUSH ENGINE OUT, U CAN BUY RAD FLUSH/CLEANER AND TRY THAT,
sounds more like a possible heater core issue the heater core is what heats your car by the fan blowing over it and through tour vents ! find the 2 hoses that come out of your firewall on the back side of the engine compartment . run vehicle for 10 to 15 min and see if both of the hoses are hot if one is hot and one is cold heater core is plugged. if both hot have a diff problem. start hear first !!