2005 BMW X5 my heater blows cold but my demister works fine the engine runs normal and theirs water in the cooling system

did you have the cooling system pressure tested? Check the exhaust while it's running see if you notice any white smoke coming out and if so does it smell like oat meal? If there is and it does smell like oat meal you have a blown head gasket good luck

Hi your car is fitted with a seperate auxillary water pump for the heater circuit it may have stopped working idealy you need to get it checked on a dealer diagnostic test computer as it will pick up
heater faults and check the electrical circuits to the webasto heater under the bonnet

add coolent, your coolent is low your heat will than return dont forget to check for leaks. cooling system should be tested with a cooling tester.you may have to take it to a radiator repair shop to have it tested..

Here is a great article that will tell you:
How to diagnose an overheating X5

change thermostat, and make sure coolant is at proper level. bleed air from system if necessary.

It is most probably the problem with blend door or blend door actuator. But just in case I would suggest to follow the entire procedure:

First you have to identify what causes the problem.
To do this you have to:
1) When engine is cold check the level of coolant. If it is low fill it up.
2) Start engine and check if engine reaches regular temperature. If your engine is not heated enough it means your thermostat does not work properly and should be replaced
3) If engine temperature is normal, then check the temperature of pipes that go to/from heater core. These pipes are located up the fire wall (easier access is from the passenger side). If pipe/pipes are cold (even engine is warm) it means you heater core is plugged and should be flushed. Keep in mind, flushing the whole cooling system is different from flushing heater core.
4) If pipe/pipes are hot/warm, turn off the fan, switch controller to the hot position, wait for 3-4 minutes and turn on the fan. Note if the cold air blows first or warm air blows first but it cools down in 5-10 seconds. If the air blows cold than it is most probably the problem with blend door or blend door actuator.
5) If air blows warm first and then cools down, then while running engine and remaining the transmission in PARKING position, press on the gas pedal until your engine reaches 3,000 RPM. Check if your heater blows warm/hot air. If it does, then your water pump does not work properly and should be replaced. If the air still cold, I would suggest flushing the heater core.

If you are adding coolant and are not seeing a leak, your leak may be internal to the engine (not good). ie. Blown head gasket or cracked head. Check your oil for signs of water, ie milky looking oil on dipstick or rising oil level even though you didn't add oil. Also do a pressure check of coolant system. If it dosn't hold pressure you have a leak someware. Get it fixed ASAP or else say good by to your engine. Also have your water pump and cooling fans ckecked as well. Don't run the AC until its fixed, it just makes the cooling system work harder. As far as the washers, the front and rear use the same container, have the pump checked as well as fuse for the pump and wipers.

water vlv could be bad it is on the drivers side of the engine compatment looks like 2 cyl with hoses on either side

My 2005 Nissan Sentra 1.8s with 55,000 mi. blows cold air from the heater. Coolant not circulating in engine. Lower hose stays cool to touch. Both heater hoses cold. Changed thermostat - didn't fix it. Coolant not leaking or dirty. None in oil - no oil in radiator. Changed worn water pump belt - pump spins freely with no noise or resistance. Cooling fans come on after warm-up. Temperature gauge stays in normal range then jumps to hot and back again. Coolant good to 10 below - didn't freeze here yet. No other problems or repairs to car. Afraid to drive and make worse. Help!