Question about 2001 BMW 5 Series

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BMW E35 95, no heat coming thru vents

When I dialled up the heater, I noticed that no heat was coming out. Fan is working, but the momentyou dial up to warm the vents are being shut off, but fan still running thru other vents.Checked valves, both ok, check waterpump, also ok. Any ideas???

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  • harderclan May 23, 2009

    Where do I find the vacuum controlled assembly please???

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  • BMW Master
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My guess is the heater matrix is blocked, check the feed and return hoses for heat after a few minutes running.
There is no cure for a blocked matrix only replacement. The hot water passes through only a part of the matrix and when you put the blower on there is no capacity to heat the air. Do not run any vehicle without coolant/antifreeze unless in emergency. This will cause the heater then the rad to quickly block.
Most vehicles running an aluminium matrix will clog within 4-5 years and 75-80 thousand miles, its common as day here in europe.

Posted on Oct 17, 2012

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  • BMW Master
  • 1,348 Answers

Check the hoses going through the firewall to the heater assembly,they should be hot.there is a vacuum controlled assembly driven by the climate control assembly.check the vacuum and the cables

Posted on May 23, 2009

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