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-   -   Entire cooling system overhaul, 2001 X5 still overheating, cools when heater is on (

Duttywineangel 04-26-2013 08:01 AM

Entire cooling system overhaul, 2001 X5 still overheating, cools when heater is on
Hello everyone,

I have a 2001 X5 3.0i. A few weeks ago, my accessories belt shredded. I took it to the repair shop, and the mechanic said that I needed to replace my water pump, thermostat/housing, pulley and belt. I had this replaced. When this was finished, I took it for a test drive and split the side on the radiator reservoir (due to not bleeding the system of air). I had this replaced and found out that in the process, someone had broken the thermostat for the tranny cooler. I replaced this, along with the fan clutch, and o-rings/clips for the tranny cooler. After this, I bled the lines, and took it for a test run. This is my question. I drove it for awhile and it kept cool. Then, I took it on the interstate, going about 70, and it started to get hot (at the 3/4 line on the temp gauge). I turned on the heat, and it immediately went back to the 1/2 mark on the temp gauge. I am wondering if anyone has any information or clues as to what may be causing this?? I would like to add that after having all of these parts replaced, my car sounds rough, and is making a new noise. (Sounds like a whine of some sort)....any suggestions?

HPIA4v2 04-26-2013 09:06 AM

You either have bad thermostat (not fully open when you are at freeway speed) or some more air in the systems that need to be purged.
The noise could be new belt being tight (not broken in) or old tensioner, usually people replace tensioner when replacing belt.

ECSTuning 04-26-2013 09:34 AM

Sounds like when you opened the heater valve by turning on the cabin heat you moved an air pocket, re bleed the system.

Duttywineangel 04-26-2013 12:10 PM

Do either of you know where to find the second bleeder screw? As I have been doing some research, I noticed that I should have been bleeding from two different screws. I was only bleeding from the one next to the reservoir. Also, should the car be running while I am bleeding it, or should the ignition just be on (not started)??

upallnight 04-28-2013 08:44 PM

Car needs to be running and the engine need to get to operating temp in order to bleed the engine of all air in the cooling system.

Duttywineangel 04-30-2013 04:34 AM

Thank you all for the helpful info!! Here's an update: It worked!! It's not overheating anymore!!!

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