blakep82
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| posted on 14/1/11 at 02:45 PM |
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heater still blowing cold? :(
got a BMW328, yes its getting on a bit now...
my heaters keep blowing out cold air. i can put the heating on full heat, and it only warms up over 2k revs, even when the engines fully warmed up. it
used to mean it was leaking and coolant was low. i've fixed the leak, but still got this problem with the heater. i can't work it out.
followed all the correct procedure for filling, bled all the air out, and it can't take any more coolant. i'm lost  any ideas?
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Daddylonglegs
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| posted on 14/1/11 at 03:13 PM |
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Sounds like your heater matrix is blocked. Is there anywhere near the matrix conection you can loosen and try to bleed it?
You need to make sure your heater controls are on max heat (don't need the fan on just water routed via the matrix).
HTH
JB
It looks like the Midget is winning at the moment......
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blakep82
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| posted on 14/1/11 at 03:22 PM |
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the connections are quite tight to get to in the bulk head (right up to the back of the engine)
hmm, maybe you're right though, maybe it is just blocked, and the extra pressure from a higher engine speed is enough to force some water round
it? i'll see if i can undo the hoses next week, and try and back flush it with the garden hose?
now, the controls are electronic i think, as in there is a dial, but no sort of control cable you can feel it operating. on the bulkhead behind the
engine, there is a small 'thing' with a hose in and out, and an electrical plug, maybe thats the valve? i just need to make sure i
don'e put water through that i guess. i assume that will be on the way in to the matrix? ie coolant flows through that to the matrix, out the
matrix into the engine?
just last time it blew cold, the thermostat housing had cracked, and blew all my coolant out
[Edited on 14/1/11 by blakep82]
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Daddylonglegs
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| posted on 14/1/11 at 03:58 PM |
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The daughter's MR2 had a similar issue where the leak was from the matrix, I replaced it but had issues bleeding it. Eventually it was all OK,
heats up a treat now. The MR2 is electronic too, just push-button selection of modes, when you select hot you can hear the flap motoring across.
Don't worry, I'm sure you'll get it sorted 
It looks like the Midget is winning at the moment......
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blakep82
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| posted on 14/1/11 at 04:11 PM |
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hmm, might just need help bleeding the matrix, the connections to it are above the cylinder head, so i wouldn't be surprised if there was air in
it, as they're higher than the air bleed screw in the radiator, weird.
i'll need to find a good steep hill, then try again. or push it off... either way suits 
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RoadkillUK
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| posted on 14/1/11 at 06:01 PM |
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I flushed the wifes heater on the saxo last weekend as it was blowing cold and she wouldn't stop complaining, after that 30 min job, it's
warm now and my ears get a rest (from that complaint anyway).
Roadkill - Lee
www.bradford7.co.uk
Latest Picture (14 Sept 2014)
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pgtips
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| posted on 14/1/11 at 06:06 PM |
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You need to lift the back up as high as you can and then try to bleed it. They are very dificulld to bleed.
Also is your engine overheating at all? They do suffer with water pump impellar failure and the cooland circulation is very low.
Worth checking.
If I die, my biggest fear is that my wife sells all my toys for the price I told her I bought them for...
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blakep82
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| posted on 17/1/11 at 05:01 PM |
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well, it did overheat when the thermostat housing cracked, but i replaced that and it blew cold contantly from there. aside from then, the needle sits
perfectly in the middle of the gauge
just tried flushing it out backwards today, seems to make a small improvement, next i'll find a nice steep hill to park it on and try and get
any air out.
seems alright for now, thanks everyone though
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