Question about BMW 318

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My bmw radiator fan turns only with de air condition is on.

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Check the fan relay.Or the fan motor.Check the voltages of the fan relay and fan motor.It should show exact 12 volt. This will indicate the exact fault.
Check the fuse for the fan and relay. Remove the fan fuse under the dash. Open the fuse box by turning the knob on the fuse panel cover counterclockwise and pulling the fuse panel down.
Unplug the lead wires running from the fan to the fan's relay. There are two leads running off the fan -- a power lead, and a ground lead. The ground lead will always be black. The wires run to a relay switch, which looks like a small black box. Pull the leads off the relay switch.

Touch the red or power lead to the positive terminal of the battery directly. Then, touch the negative lead from the fan to the negative terminal on the battery. Always connect the negative lead last and remove it first from the battery. Make sure that you are not touching the battery directly or that you are not touching any exposed wiring. Hold the fan wiring by the protective plastic coating. If the fan starts, the fan relay is not the problem. If it does not start, the fan motor/and relay has failed. Thanks. Keep updated for any more query. You can rate this solution and show your appreciation.

Posted on Jul 08, 2010

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The radiator fan on my 2007 bmw 525i works fine while car is driving. Once i stop at a red light or in traffic the the fan stops working, ac blows hot air and mins later the car overheats. The car has a...


My guess is that your electric fan is NOT operating at all. Under normal conditions, just going down the highway, your cooling system will function just fine without a fan running. The air flow through the radiator is adequate to keep things cool. However, when you stop, you quickly get into an "overheat" situation. Actually, you should be able to hear your fan begin operating when your engine temperature starts climbing or your air conditioner requires the fan to do its thing. Note: If you've ever severely overheated your engine, your problems may be worse than just a fan not running, but you really do need to confirm whether your fan is operating correctly, or not. Another note: I had a vehicle with a tendency to overheat when stopped. It turned out to be a faulty (leaking) pressure cap on the cooling system.

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My bmw 318i air con fanbelt broke how urgent is this


Are you sure that the belt only turns the AC compressor? Be sure that it's not also connected to the fan and the power steering pump. If it's only turning the air conditioning compressor then you can live with it for as long as you can live without air conditioning.

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My BMW 318 air con fanbelt has broken is this an urgent problem or can I take time in replacing it.


Are you sure that the belt only turns the AC compressor? Be sure that it's not also connected to the fan and the power steering pump. If it's only turning the air conditioning compressor then you can live with it for as long as you can live without air conditioning.

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which fan? Interior fan, or radiator cooling fan? Is it the radiator cooling fan, or the fan controlled by the air-conditioning?

Run the vehicle, turn on and off the air-conditioning to identify which of the fans in the engine bay is the one triggered by the air-con and which is the primary cooling fan.
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Most cars have an 2 electric fans on the radiator. One will run when the coolant gets hot and the other will run when there is more cooling demand OR it will run when the AC is turned on. My guess is, the second fan is not running when your AC is. Your AC system creates heat of its own. The heat is removed through the condenser (radiator-like coil) which is usually located in front of your engine radiator. Without a fan the heat is transferred into your engine radiator causing it to over heat. This would explain why it overheats while idlling and not while driving. While driving, air is flowing through the radiator and condenser. to provide the necessary cooling. In short, check to see if both fans are running when the engine is hot and the AC is turned on.

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1994 BMW 318i runs hot, just recently had the fan clutch and thermostat replaced and its fine. This seems to happen when I turn the AC on. I am a novice is there something I can do myself to check the air...


There should be an electric fan in front of your radiator. Check to make sure that it turns on whenever the air conditioning compressor kicks on, or whenever the car is too hot. If not, the electric fan may have failed, but the most common failure point is the relay for the electric fan.
There may be a temperature sensor in the end-tank on the radiator with a three wire plug. That is supposed to turn on the electric fan when the engine gets too hot. If you short the two hot wires to the brown ground wire with the key turned on, you can test to see if the relays work for the high and low speed settings. If the contacts have burned away in the relay, you will hear it click but the fan won't turn on. The sound will help you find the relay.

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1 Answer

I have a 1994 bmw 525i series it is over heating with a new waterpump and thermostat


Suspect #1 - air in cooling system. These can require several bleeding attempts to get all the air out. If the overflow reservoir is old and cracked inside, it will keep getting air back into the system.
Suspect #2 - radiator plugged internally with mineral deposits from hard water or silicates from using the wrong coolant. Does the radiator feel hot all over when the car is hot?
Suspect #3 - radiator plugged externally with organic material or the hair from the long haired cat that sleeps in your garage. Put a light behind the radiator and see how well you can see through it from the front grill.
Suspect #4 - failed fan clutch and/or failed electric fan. Does the overheating happen on the highway, or only when stopped or moving slowly? Does the electric fan kick on whenever the air conditioning compressor kicks on? The most common failure point on the electric fan is the relay.
A defective new thermostat is possible but unlikely.

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Hello Sir, I have replaced the radiator, radiator heat sensor, radiator cap, and all hoses. There are no leaks coming from the engine. I have also replaced the anti-freeze with BMW manufactured...


After the car is cool and has been sitting for a while, remove the radiator cap, have someone start the car, the coolant in the radiator should drop a little, and there should be movement, if there is no movement, let the car run for a while, with some systems it won't cycle enough to notice until the engine warms up. If there is still no movement, you likely have a bad water pump and/or thermostat.
Another method as a "just to be sure", drain the coolant overflow tank, and fill it with clean distilled water. Drive the car for a few days (carefully not to overheat it obviously, if the engine is getting too hot to drive normally don't do this test). If after a few days of driving the fluid in the overflow tank is still clear (water), then there is no circulation in the system.
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