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hobson

300tdi heating problems

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I've been battling to get our heater working for a few weeks now, it ran dry in december when the waterpump and gasket went. after fitting a new pump and doing the P gasket as well, it seemed to work well for a few days but then kept going cold intermittently.

I've just fitted a new thermostat and filled the coolant as it was empty again, but to no avail.

after a drive around tonight to get it up to temperature, it went warm very briefly, but then went cold again.

It's had good antifreeze in it all winter so i doubt the heads cracked, and i can't see anything leaking from anywhere either.

Any ideas please? :(

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hobson, I've had the same problem in the past. Have you bled the heater box ? crack the jubilee clip on on of the hoses on the heater end and hopefully you should feel escaping air followed by a return to heat :)

HTH

Mo

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No i haven't done that, i didn't realise it needed bleeding, though it makes sense! is there any particular tube to loosen? i can't think at the moment how many tubes go into it!

if i'm lucky, i'll get it working by summer!

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2 hoses to heater one is feed from cylinder head water jacket, other is return.

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Thanks for that, so whats the best procedure to bleed the system? including the heater matrix?

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Be sensible, get the engine warm but not scalding hot! With the engine running carefully slacken each hose at the heater end one at a time (you only want the air and a little coolant to escape, not blow the hose off :) ). You will probably get some air out before any coolant escapes, that's good. Just be careful and give it a go, it's how we all learn :) and keep an eye on the surge tank coolant level.

If this doesn't work then back to the drawing board.

HTH

Mo

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