Engine Overheating/Cold air from Heater - BMW Forum - BimmerWerkz.com
5-Series (E12,E28, E34, E39, E60) Chat relating to the BMW 5-Series of all generations. Specific models include: BMW 518, BMW 520, BMW 520i, BMW 530i, BMW 528i, BMW 530i, BMW 518i, BMW 524d, BMW 525i, BMW 525e, BMW 528e, BMW 540i, BMW 535i, BMW 520d, BMW 525td, BMW 525d, BMW 530d, BMW 525i/xi, BMW 530i/xi. (BMW 5-Series Forum)

 
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#1 (permalink) Old 11-25-2003, 04:17 AM
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1995, 85k miles, auto trans 525i: Temp gauge redlined on wife. I drove it home suspecting thermostat failure and thought I broke it loose. Replaced theromstat. Problem continued. Heater not working properly. Left mech-shop after replaceing radiator and temp gauge redlined @ 80 mph. Just prior to redline, heater started blowing cool air into cabin.

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#2 (permalink) Old 11-25-2003, 09:27 AM
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your heater core may be broken internally. which would cause a problem keeping the coolant pressurized. it would need to be changed

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#3 (permalink) Old 11-25-2003, 10:24 AM
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lwebbs on the right path.. could very well be the core. do your windows fog up at all when the cars on?

if not then open your rad i bet your low on coolant or someone from the shop carlessly forgot to put enough antifreeze in the car.

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you know your not paying attention when this happens:

<div class='quotetop'>QUOTE</div><div class='quotemain'>Are you refering to his Signature? oh shit, i just remembered i used my name in my sig... I just 0wn3ed myself. </div>
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#4 (permalink) Old 11-26-2003, 04:30 AM
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I took it back to the shop this morning. Technician suspects the thermostat wasn't installed properly. His plan for today is:

1. Verify thermostat installation

2. Verify system pressure level constant - bleed off air

3. Verify the impeller of h20 pump is functional.

Wish me luck.
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#5 (permalink) Old 11-26-2003, 09:23 AM
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good luck

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you know your not paying attention when this happens:

<div class='quotetop'>QUOTE</div><div class='quotemain'>Are you refering to his Signature? oh shit, i just remembered i used my name in my sig... I just 0wn3ed myself. </div>
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#6 (permalink) Old 11-26-2003, 09:35 AM
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how did it go blue?

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#7 (permalink) Old 12-17-2003, 07:41 PM
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If you are not losing coolant, check the heater valve. This is often overlooked. It can cause overheating if it malfunctions. This will also give you no heat in the car.

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