Question about 2001 BMW 3 Series

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Coolent is not going through hose to heater core on a 2001 325xi bmw

Heater core has been flushed out and temp gauge ion dash reads good running temp .still the bottom hose to the heater core has no coolant going through it

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Have you taken the house off to see if there is any blockage?

Posted on Jan 03, 2014

Testimonial: "yes hoses are fine i blew them out the way the coolent runs and then backwards, still the hose to the heater core is empty,,"

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SOURCE: bmw 320i touring 1995 n reg

check and see if you get water/coolant circulates when you have the cap off (only check from cold start) the original water pump came with a plastic impeller and tends to strip on the shaft also check your thermostat before replacing water pump.

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SOURCE: my 2001 bmw 325i service engine soon light came on

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SOURCE: bmw 318i e46 overheating. took head off an had

the fan is the problem, try replacing the temperature sensor that the fan connects too

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SOURCE: Solve Your ''where is the heater core on a 1993 bmw 740i''

heater core is on the fire wall on drivers side of car behind dash.

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SOURCE: Instuctions for 2001 BMW 325i Heater Core Replacement...

the blower fan on my BMW 530 does not work

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Truck doesn't heat while idling


Could be low on antifreeze. The heater core is the highest spot in the cooling system and it may develop an air pocket. Another possibility is the thermostat is stuck partially open and doesn't let the engine warm correctly, watch your temp gauge on the dash and see if it comes up to the middle like it should while idling. If it doesn't, it may need replacement.

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I would change the sending unit for the temp gauge make sure that is full of coolant take the radiator cap start it fill coolant until the the thermostat opend to be sure it did. Then make the coolant is circulating and make sure it is full. The heater core could also be plugged

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Heater stop working


Check you other question. I just posted this.

Make sure the coolant level is full in the reservoir.

If the coolant level is good feel the hoses that go to the heater core back by the firewall. If one is cold and one is hot that the heater core is plugged. I have had fairly good success back flushing the heater cores and getting them to work. If back flushing does not work than the heater core will need to be replaced. The entire dash will need to be removed to do this.

If both the hoses are hot than it may be the blend door actuator. You should hear a distinct difference in the air flow from the vents by moving the heat control from full hot to full cold.

The last thing is the t-stat could be stuck open. If this where the case than the temp gauge will also be reading low.

Check those out and let me know what you find.

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1 Answer

Heater doesn't work


Make sure the coolant level is full in the reservoir.

If the coolant level is good feel the hoses that go to the heater core back by the firewall. If one is cold and one is hot that the heater core is plugged. I have had fairly good success back flushing the heater cores and getting them to work. If back flushing does not work than the heater core will need to be replaced. The entire dash will need to be removed to do this.

If both the hoses are hot than it may be the blend door actuator. You should hear a distinct difference in the air flow from the vents by moving the heat control from full hot to full cold.

The last thing is the t-stat could be stuck open. If this where the case than the temp gauge will also be reading low.

Check those out and let me know what you find.

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replace the thermostant again this time get a hotter temp thermostant and buy it from the dealer, the other thing is that these cars are known for the temp sensors being bad this would give you the false reading on the gauge but would not affect the heat, if its taaking a long time then i would replace the stant and this time or before replacing the stant i want you to flush out the heater core, remove the hoses from the heatercore and use a water hose to flush water through the heater core, a plugged core will not throw heat or will start to allow water to flow when it gets good and hot to flow through the retricted core due to rust and crud, try the flush first and then try a new temp sensor if the flush helps the heat, hope this is helpful good luck.

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in the case of no heat and slight smell of antifreeze i would back flush the heater core and also check the carpet around the heater vents under the dash if the heater core is leaking the carpet may be wet. find the 2 hoses going to the firewall if you start the motor and let it warm up with the heater on 1 should be hot and one should be cold disconnect them and use a garden hose to flush water in the hose thats cold.

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your heater core may be clogged up. The temp of the inlet hose should be about the same as the outlet hose-under the hood. If one is signifcantly more hot then suspect a clogged heater core. You can try to back flush the heater core. Remove the heater hoses at the engine side- not the heater core side because the hose fittings are fragile. You want to blow through the hose that was cooler to the touch with light compressed air or water pressure. be sure to bleed air out of system. If water flowed freely through the heater core then you may have an issue with the blend door on your heater box, or heater control. Do not blow up the heater core! keep pressure below the psi rating of the radiator cap.

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