Question about BMW X3 Series
Overheated, hose had come blown off. cap & upper hose replaced. bled system filled tank placed caps back and started engine heat never got warm on low( always takes awhile) but after reaching mid point fan did not come on. what do you think my problem is?
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Posted on Jan 02, 2017
Remove and raise upper hose at thermostat end and remove lower rad hose.
Fill rad with a hose and watch for flow from bottom rad hose and/ or bottom rad hose connecton.......water should fall though rad easily.
Honda rads are cheap.....any restriction....replace rad.
Remove thermostat....fill thermostat housing with hose and watch for water flow at bottom rad hose.
Remove heater hoses.......flush back and forth until a good flow is present "With heater control set to hot" if no or poor flow....replace heater core.
Stop leak can plug everything.
Also.......not likely causing over heating....but ....at your mileage,if you do not know if the timing belt has been changed.....CHANGE IT NOW!
Water pump is optional at this mileage.
Posted on Aug 24, 2009
Testimonial: "thank you for the very clear, step by step instructions for diagnose and remedy"
Do the radiator fans come on? Turn on the A/C which should start the fans automatically. Does that stop the overheating? Replace the temperature sensor if engine heat doesn't turn on the fans (A/C off). The water pump can be checked by removing the thermostat and lowering the water level in the radiator until the tubes are exposed at the top. With the engine cold, start it and watch for water being pumped into the radiator (it should be a fair quantity), which points to an effective water pump. Shut off the engine, replace the thermostat, and refill with coolant.
Posted on Sep 26, 2009
Replace the thermostat. It will be fine after that. I know thats what everyone says anytime there is an overheating problem but in this case with the way the system works and it has been working fine up to this point, it's gonna be the thermostat.
Posted on Nov 24, 2009
SOURCE: engine overheating
The coolant flush on radiator doesn't do any good. Since you have changed all the key components and still gotten overheated, then the root cause of the problem is the radiator. It got clogged up in small tubes blocking coolant flow. No matter how good the water pump is working but the radiator got clogged up, coolant is not circulating therefore the heat from the engine can't be dissipated to the radiator. Replace your radiator, don't even think about rebuild it. It has been used for 11 years. Make sure to have the correct coolant/water ratio to keep radiator life for years. Good luck.
Posted on Dec 03, 2009
Testimonial: "Thanks, it was the radiator afterall. They claim hose was attached too tight; caused it to chip. I think I was taken for a ride by AAMCO & Valvoline."
1999 Grand Am Se 2.4L- We Checked The Relays And They Worked. Then We Checked All Fuses And They Were Good. But The Fans Still Dont Come On At 200 Degrees. When We Turn The AC On Both Fans Come On And Stay On After We Turn Off The AC Then When We Shut The Car Off They Dont Come Back On? And The Car Normally Runs At 180? Any Solutions?
Posted on Apr 04, 2010
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