The cause of the over-heating is due to a lack of cooling efficiency which is why the temperature does not creep up if you put the heater on. Either the pump is not moving enough coolant, or something is restricting the flow. It could be that the impeller has failed, that does happen - sometimes the plastic impeller breaks up - and sometimes it will spin on the shaft.
Or could it be that the flow is restricted - have you been using BMW blue coolant? Other coolants or plain water will cause corrosion that may block flow. You can flush the system as described below:
https://www.meeknet.co.uk/e31/E31_Co...g_Bleeding.htm
Timm..2007 E64 650i Individual Sport..1999 E31 840ci Individual Sport..ex owner of 2000 E38 740..1999 E38 740i V8 M62..1998 E38 735i V8..1993 E32 730i V8..1988 E28 518i
My BMW Repair YouTube Channel
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Last edited by TexaZ3; 05-07-2023 at 09:46 PM.
E36/8 2000 M Coupe Cosmos Black/Black
Shark, Conforti CAI, B&B Exhaust, H&R, Bilstein, AKG Subframe/Diff, UUC TME Red/Caps, Swapped Front Hats, Ice>Link.
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I should have said oxidize rather than ferrous rust...
Timm..2007 E64 650i Individual Sport..1999 E31 840ci Individual Sport..ex owner of 2000 E38 740..1999 E38 740i V8 M62..1998 E38 735i V8..1993 E32 730i V8..1988 E28 518i
My BMW Repair YouTube Channel
My Current 840ci Sport Individual
My Current 650ci Sport Individual
My E31 Repair and Information Website
My E38 Repair and Information Website
My E63/E64 Repair and Information Website
Chase - Heroes to a generation
I have a '91 850i w/ manual trans and I am looking at the Nissens radiators. It's not entirely clear which of their E31 radiators is the correct one for the early manual cars. Can you confirm that this is the correct part number?
BMW: 17112242138
Nissens: 60747A
Of note, only FCP Euro shows the above as the correct part numbers. Other sites such as eEuroparts, Newparts, autohausAZ are showing 17111723468 – Nissens 60748A as the correct part number.
Thanks.
Last edited by sprnova; 06-21-2023 at 09:51 AM.
The other best Radiator for these cars, was under $500 Now over $800 but amazing, They will make to order for Automatics.
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