Has no heat and why is the fan on all the time

60

Asked by Sep 08, 2011 at 12:44 PM about the 1999 BMW 3 Series 323i

Question type: Maintenance & Repair

4 dr. "VIN#WBAAM3332XCD56099  No heat.  Just replaced a radiator hose and now wondering if the thermostat is needed.  The fan stays on all the time.  Wondering what to do.

9 Answers

3,085

Also install the T stat of course, and "burp" the system of any air when replenishing the cooling system. Run the heater on full heat or on defrost. That way coolant makes it way the heater core (it's like a mini radiator). Some system "burp" differently. Usually you can back out the temperature sender switch (near the water pump) and that will release trapped air.

2 of 2 people found this helpful.
60

That did work but the fan is staying on so do not know what else to do but put a togo switch to the fan for the motor. Not sure what else to do. She has alot of miles on this vehicle. Over 200,00. Thank you for your help.

1 of 1 people found this helpful.
1,665

which hose did you change, the bottom one has a temp sensor in it. also there is a temp sensor on the block that could be defective. also get your fault codes read because the fan staying on can be linked to other issues with the engine.

2 of 2 people found this helpful.
60

Larry changed the upper radiator hose. He also checked the codes and no codes available. The thermostat assembly has been replaced with a new one. The fan still will not shut off. He did check all other hoses and the bottom hose is still cool while the upper one is warm. He is really baffled. Need help.!

5 of 5 people found this helpful.
3,085

"fan still wont shut off"??? Is the A/C on. Could be a faultly temp sender switch. If the lower hose is still cool then the T stat is not opening, probably due to the fan still running and keeping it cool. Try driving it and see if the T stat opens. Even though you replace the T stat housing the T stat could be defective or sometimes people put it in backwards or there is still some packaging plastic stuck on the assemble to make it stick closed. Other things to check for fan operation is AC pressure sender/switch, HI and LO speed relays.

3,085

If your burped the system and still no heat to heater core to blow heat then it could be the water pump. I know many BMWs have had plastic impellers on the water pumps and people usually upgrade to metal or alloy ones. This is also a common problem in VWs/Audis. Plastic and heat aren't a good mix the the plastic slowly deteriorates with no signs or typical water pump failure such as leaking shafts or squealing noise from bearings.

1 of 1 people found this helpful.
30

Got bmw 325 i no heat i replaced water pump,heater core,tstat,heater valve still no heat

3 of 3 people found this helpful.
10

Check your fuse first it soynds like the blower resistor

1 of 1 people found this helpful.
10

got bmw 325i replaced a/c condenser fan assembly, sill no cool air

1 of 1 people found this helpful.

Your Answer

3 Series

Looking for a Used 3 Series in your area?

CarGurus has 32,835 nationwide 3 Series listings starting at $999.

ZIP:

BMW 3 Series Experts

  • #1
    Tom Demyan
    Reputation
    5,080
  • #2
    Robert Charlson
    Reputation
    1,640
  • #3
    grolyate
    Reputation
    1,260
View All

Related Models For Sale

Used BMW 5 Series
463 Great Deals out of 15,836 listings starting at $1,995
Used BMW M3
34 Great Deals out of 1,978 listings starting at $6,995
Used Mercedes-Benz C-Class
677 Great Deals out of 28,017 listings starting at $1,000
Used Audi A4
254 Great Deals out of 11,825 listings starting at $199
Used Ford Mustang
586 Great Deals out of 36,170 listings starting at $1,800
Used Honda Accord
1,019 Great Deals out of 56,740 listings starting at $899
Used BMW 7 Series
123 Great Deals out of 5,519 listings starting at $1,995
Used Mercedes-Benz E-Class
576 Great Deals out of 20,180 listings starting at $2,500
Used BMW X5
374 Great Deals out of 13,082 listings starting at $1,000
Used Chevrolet Camaro
398 Great Deals out of 30,578 listings starting at $2,495
Used Honda Civic
734 Great Deals out of 69,332 listings starting at $1,499

Used Cars For Sale

2017 BMW 3 Series For Sale
164 Great Deals out of 6,853 listings starting at $25,900
2016 BMW 3 Series For Sale
38 Great Deals out of 1,538 listings starting at $16,799
2015 BMW 3 Series For Sale
65 Great Deals out of 1,631 listings starting at $14,995
2014 BMW 3 Series For Sale
276 Great Deals out of 5,413 listings starting at $12,699
2013 BMW 3 Series For Sale
58 Great Deals out of 1,562 listings starting at $10,523

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.