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Mo (guest)
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Hi All,

I need some advice for my 1995 Bmw E34 540i V8 and hope someone can help me as I have been given different opinions and need a reliable source to lead me in the right direction.

My 540i used to be perfect until about 2/3 weeks ago where I started to notice my heater playing up. It took ages for it to blow out hot or warm air through the vents. I checked the coolant level and all is fine and well. No loss of water or coolant. now its got to a stage where it only blows out cold air. I have tried tapping the heater valve but didn't help until out of frustration, I hit the highway and put my FOOT DOWN and what do I feel blowing against my face... hot air through the vent ! I was pleased but as soon as I stopped, the air went ice cold again. the temp needle has always stayed between the 1/4 or middle and never above.

I have had someone tell me to buy a new heater valve , a thermostat, a new heater hedgehog etc. and to be honest, before I spend a penny, I want to be led in the right direction as I have learnt from my previous mistakes and just fired into everything in my old E34 without thinking twice and spent a lot of ...

can anyone please give me some advice as to what's happening here... it will be greatly appreciated.

Kindest Regards and Seasons Greetings.

This post was auto-generated based upon a question asked on our tech article page here:
Old 12-21-2013, 01:02 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #1 (permalink)
Join Date: Jul 2012
Posts: 3,189
This does sound like a low coolant flow problem. You can check the temp of the coolant going into and out of the heater valve. if it cools off going out, with the heater on, this would indicate a faulty valve.

You could also have a restricted heater core or a faulty water pump.

- Nick
Old 12-21-2013, 01:02 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #2 (permalink)

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