Question about 2001 BMW 325

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I have a 2002 325i BMW with 85K miles. It's had temp gauge problems for quite a while but until recently had no signs of real overheating. (I drive her only rarely though).The gauge would stay straight up then waiver back and forth clear up to the other side of the red and right back. But no signs or smells or smoke. Oil and coolant levels were fine. Then it went to the red and a red light came on! I'd never seen a red light. Was afraid of harming engine so had it looked into asap. Already had coolant tank replaced late last fall. Radiator, coolant sensor and thermometer replaced 12/02/201. This time the fan clutch needed replacing. BUT none of those fixed the errant gauge problem. Took to a master mechanic who tested the temp gauge first and it was almost on the mark. Test drove her and temp was Really 250 when temp gauge was only at 3/4rds mark. Also, had to sit to let her cool down; using hose water didn?t cool her right down 30*. He couldn't test her farther because he found out the threads on the coolant tank were stripped and the radiator hose with the bleed valve the last mechanic replaced with a brass plug of sorts needed replacing. Done. BUT that didn't stop the gauge problem. Checked pressure on new coolant tank and it held at 20 lbs. for 30 minutes. Test driven about 20 miles; fine. Test driven next morning 30 miles; overheated last 1.5 miles. BTW, this mechanic has a BMW mechanic of 7 years helping him daily too. At first they thought it was the water pump but it's circulating the new BMW coolant. Today it overheated just idling for about 30 minutes. That was new. BTW, she has an A/C problem too. Only has cool air blowing on driver's side. No check engine light has ever come on during this problem. It does have one; a couple times in the two years I?ve had her it came on. I put fuel injection cleaner in her gas tank and that resolved the problem asap. Any and all suggestions would be greatly appreciated. These two mechanics have 25 years between them and have never seen this problem.

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To verify if cooling system damage exists.
Drain the engine coolant.
Remove the intake manifold.
Remove the plastic heater core feed pipe.(located under the intake manifold).
If the coolant pipe cannot be removed after removing securing hardware, the VANOS banjo bolt must also be removed thus allowing additional clearance needed to remove the pipe.
Visually inspect the front (inside) of the coolant pipe.
If the plastic on the inside of the coolant pipe shows no signs of deterioration (smooth surface) the engine should be reassembled using new gaskets and O rings where necessary.
If the plastic on the inside of the coolant pipe shows signs of deteriorated (worn away, bubbling, ect) this is an indication that the engine has been severely overheated and these components must be replaced.....Cylinder head gasket,all coolant hoses,all plastic coolant pipes,coolant expansion tank and cap, radiator, water pump, thermostat, oil and filter....

Hope this is some help to you ??

Posted on Jul 07, 2011

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