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Old 08-15-2013, 12:53 AM   #8
Slowered318's Avatar
Join Date: Jan 2002
Location: Toronto
Posts: 5,998
Having some troubles now.

Since I changed all the hoses and removed the bypass valve (from the recall) I've been experiencing a strange problem with my cabin heater. I have almost no heat at highway speeds but when I come to a stop/crawl I have plenty. Engine temp and coolant level seems to be normal, I bleed the coolant twice using the uphill method to remove any air, tried disconnecting the power to the heater core valve. Checked over the system a few times and still getting the same problem at prolonged speeds above 50.

I have a feeling I might have connected the heater core lines backwards but it doesn't make sense that would have any effect. The heater core is just a closed loop from the head to the water pipe or does it have some sort of check valve? I've pulled over a few times and both lines to the heater core are toasty warm. I don't want to replace the heater control valve or thermostat if possible, they both seem to be working.
Attached Images
File Type: jpg waterpipe.jpg (106.5 KB, 37 views)
The major difference between my 318is and an e30 M3 is that the noises come from the engine and not the passengers
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