New head gasket - heaters STILL cold - disco 300tdi

You may have all followed my tails of woe on my Help!!! Heaters cold on Discovery 300tdi thread!!!!
I have had my head gasket replaced, head skimmed, and for a very short time the heaters were aired. HOWEVER yesterday I took her (being my 300 tdi) on a 16-17 mile round trip, relatively flat roads, not a lot of hills, and she was fine, done a couple of shorter 2-3 mile runs this morning, all ok. Then this afternoon, went 2 miles up a hill (this is not a massive hill, degrees vary from probably from 30 to 45 degrees, and low and behold she over heated again. Absolutely fine on flat and downhill, but it would seem that she doesn't like going up hills !!! - no good really for where we live!!
Heaters freezing, however at about 3000 revs they were getting slightly aired (not any more though!)
Please can someone shed some light - is it the head - I mean I have to say that the car has run 10 times better than it was doing before, loads of power and apparently one of the valves needed reseating when the head was skimmed, but that has been great, just this overheating under load.
Could it just be an airlock? Or is it something more sinister? Although we took the head off and had the problems with it, it was professionally put back together!
Thanks in advance
Vikki x

have u cleand out the water system ? also have u nbleed the system

Yes water system dropped, fresh water and anti freeze put in!

System was bled fine (thermostat housing and rad, and expansion tank filled and bled in the correct manner)

Hubby has just done the same roads as me, (after filling the thermostat housing) and also a reall really steep lane, and the needles not moved on the gauge.

At 3,000 revs the heaters get sligtly aired but no where near the heat they are supposed to be!

What on earth is it?

have u a jet wash or hose use hose and back feed water throu system till water cums clear also could be dodgy stat ?

I thought about the dodgy stat first port of call. But why would it overheat on certain times and then be fine others!
The pipes from the thermostat housing to the rad get hot, but the one at the bottom of the rad is aired. The pipe to the heater matirx is hot and the one coming away from it is cold!

air locks then

So how do I solve it then?
I have bled it right (filled up to level in expansion tank, put cap on, filled rad, put cap on, and filled thermostat housing to top, put cap on)
also filled pipes in heater matrix and put back on.
ran round now for over half an hour, up extremely steep hills, temperature sits happily at half way!
BUT heaters are still cold!!!!
I am well at a loss!

I read a similar thread on hear the other day, same problem, heaters were cold, it turned out they ended up doing the head gasket but did not have the head skimmed, when it was removed and checked it was warped and needed a mil of it. Just seen you had the head done and the only other thing could be a blockage/air lock still in the system

harris hawker said:

I read a similar thread on hear the other day, same problem, heaters were cold, it turned out they ended up doing the head gasket but did not have the head skimmed, when it was removed and checked it was warped and needed a mil of it. Just seen you had the head done and the only other thing could be a blockage/air lock still in the system

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I think the thread you are referring to is mine (Help.....heaters cold on discovery 300tdi).
That was the two month scenario, of going through water pumps, thermostat etc, then had to have the head skimmed.

I am just so annoyed that the heaters are still cold, but then go aired at 3.000 revs. could it be that the heater matrix is blocked???

because I'm too slack to read all of it, did you have head crack tested and have you checked all of coolant system properly

I have been told that the head was pressure or crack tested, and also I beleive that the coolant system has been checked. Hubby checked every bloody pipe and has cleaned each one, before head was done, however I think that there could still be rust or something in there!! Is that going to be the next option?

ok best getting it sniff tested or u can always use some good old K seal

I think that is going to have to be the way.

I am going to try a new water pump first though.
I have been thinking, and logically speaking, I first off lost my heaters, then the water pump went, then the head gasket went between the cylinder and the water jacket if that makes sense (or that was the order we discovered the faults in).
Could some sort of blockage have caused the water pump to fail and then in turn blow the head gasket, OR could the water pump have failed because of the head gasket failing?
Am I missing the fact that there could have been a blockage and that just hasn't been solved.
Would a cracked head not have caused more problems??? And also it's not pressurizing?
It's baffling me I have to say!

viks3457 said:

I think that is going to have to be the way.

I am going to try a new water pump first though.
I have been thinking, and logically speaking, I first off lost my heaters, then the water pump went, then the head gasket went between the cylinder and the water jacket if that makes sense (or that was the order we discovered the faults in).
Could some sort of blockage have caused the water pump to fail and then in turn blow the head gasket, OR could the water pump have failed because of the head gasket failing?
Am I missing the fact that there could have been a blockage and that just hasn't been solved.
Would a cracked head not have caused more problems??? And also it's not pressurizing?
It's baffling me I have to say!

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where abouts are u maybe i could drop in and ave a look

We are near Burnley in Lancashire (well between Burnley and Rochdale). Bit of a way away from Cheshire???

viks3457 said:

We are near Burnley in Lancashire (well between Burnley and Rochdale). Bit of a way away from Cheshire???

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lol would that be bury i need to pop up that way soon have to drop sumert off for my daughter in bury

P.M.V.Gavin said:

lol would that be bury i need to pop up that way soon have to drop sumert off for my daughter in bury

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I'm about 10 miles from Bury!

bmw diesel lump (omega/rr) the worn water pumps do draw air in when running-pressure test shows it as stationary they tend to drip. Mates one did this

fanatic said:

bmw diesel lump (omega/rr) the worn water pumps do draw air in when running-pressure test shows it as stationary they tend to drip. Mates one did this

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mate its a disco 300tdi

P.M.V.Gavin said:

mate its a disco 300tdi

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Thanks for that - I though I was losing the plot then!