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[JamesV6CDX]

It's an airlock I'm convinced.

I flushed the whole cooling system tonight and reverse flushed the matrix.

I refilled with coolant, and ran the car with the cap off. I was getting some impressive heat in the car, then!!!

Took it for a run, and the heat gradually died away. Came back home and slowly removed the header tank cap. It was just "gurgling" for ages, it got rid of loads of air.

Took it for a run, got some more heat again, and then it went away.

Seems a V stubborn airlock, how should I go about removing it?

[Marks DTM Calib]

So you have carried out the test I sudgested then?

What was the outcome!

[JamesV6CDX]

So you have carried out the test I sudgested then?

What was the outcome!

The outcome was no different mate, because both pipes were hot anyway....  I did try it

[TheBoy]

have you reverse flushed the matrix?

[TheBoy]

another thing to try - remove vac hose from hbv...

[JamesV6CDX]

TB

Yes I've reverse flushed it

And removed the vacc hose

[Marks DTM Calib]

SO, you are confident that the VAC is good and that the pipes are connectd the correct way round to the HBV (i.e. the one from the engine is to the bottom outlet and the one to the matrix is the top outlet).

I have seen quite a few that are wrong following HBV replacement.

Dont over look the obvious!

[mark.adams]

I refilled with coolant, and ran the car with the cap off. I was getting some impressive heat in the car, then!!!

Took it for a run, and the heat gradually died away. Came back home and slowly removed the header tank cap. It was just "gurgling" for ages, it got rid of loads of air.

Took it for a run, got some more heat again, and then it went away.

Seems a V stubborn airlock, how should I go about removing it?

Thats exactly what mine does.....

[JamesV6CDX]

SO, you are confident that the VAC is good and that the pipes are connectd the correct way round to the HBV (i.e. the one from the engine is to the bottom outlet and the one to the matrix is the top outlet).

I have seen quite a few that are wrong following HBV replacement.

Dont over look the obvious!

Just had a check. The top matrix hose goes to the top HBV connection. The hose from the bottom HBV connection goes back around to the engine...

[Entwood]

[start Random thoughts ...]

If you get initial heat the pipes must be the "right" way round.

Flow obviously starts then stops, is this about when the thermostat opens ?

If so then it is a flow regulation issue, or could it be a "weak" water pump ??

Have you run the system to fully warm with the header lid off and "burped" ALL the hoses you can reach ??

If both pipes remain hot when air flow goes cold, then it might be nowt to do with water system but a failure of the cabin control system?

[/end random thoughts]

[JamesV6CDX]

I'm convinced it's coolant related... when I reved the engine hard I had a burst of heat!!

TBH, it's just about acceptable at the mo actually. I may just be used to my singing and dancing facelift, which makes getting into something a little older etc mean you notice things you wouldn't usually.

I'll see how it goes, if it becomes unacceptable again, and engine temp is otherwise stable - I'll be throwing an auxiliary coolant pump in there

[Andy B]

I.......  I'll be throwing an auxiliary coolant pump in there

what about the ordinary water pump? Is it plastic & lost an impellor blade?  :-/ (I don't know -- just a guess as the diseasal cars tend to have plastic water pumps)

[mark.adams]

If the water pump was sh@gged or weak wouldn't you suffer overheating problems? I would have thought you'd see the tmp gauge going up and the fans cutting in when in normal driving mode as opposed to sat in traffic.
I have thought along these same routes as i have the same problem.
After a flush, for the first drive is it great, then the heat gradually gets less and less??

[Marks DTM Calib]

The fact that you get heat when revving sudgests to me that you have a vac problem..........do you get heat with the vac feed to the bypass valve disconnected.....or when you suck on it?

[JamesV6CDX]

The fact that you get heat when revving sudgests to me that you have a vac problem..........do you get heat with the vac feed to the bypass valve disconnected.....or when you suck on it?

I've tried disconnecting the Vac from the valve (I've left it off and plugged for a while) and it makes no difference. Is anything else vacc contrtolled that could be effected by revving?