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P reg 520i, water is not going round the engine, changed the water pump & thermo, heater not blowing warm, but not overheating.

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richochet

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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

Posted on Feb 10, 2011

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On most cars (all that I know of) the heater works by directing the hot water from the engine through a small radiator in the cabin and blowing air across it with a fan. If you hear and feel the fan blowing air then it could be that the valve that diverts the hot water to the small radiator is bad and no hot water is being circulated thus no warm air. In order to fix that you would have to locate the valve and replace it- many times they are in hard to reach places.
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could be waterpump?
i was going to say rad fan,but if so heater would be hot.
lack of coolant will make heater core to blow cold,if engine heats up with full coolant,usually means poor or no circulation.
water pump?
run engine with full coolant,at operating temp.with rad cap off and look in rad cap hole and see if there is movement of water inside rad.
[rad fan will not come on if water is not circulating through rad water pump?]

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