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[dave the builder]

Kettle of hot water will get you a brand new windscreen.

bit inconvenient phoning Autoglass  every morning though 
plus there's the insurance excess
it could end up costing Terry the same money it does to run an Omega 

[STEMO]

Kettle of hot water will get you a brand new windscreen.

bit inconvenient phoning Autoglass  every morning though 
plus there's the insurance excess
it could end up costing Terry the same money it does to run an Omega 

It's the pool car, only gets used when there's a job on. 

[Doctor Gollum]

congratulations on the MOT pass Terry 

You've a year to spend fixing it

working Heating might be useful THIS WINTER 

Unless you use the VGG screen defrost tool

Nah, if the news is to be believed we'll all be locked indoors until the Deliveroo runs out of food

[terry paget]

This car never gave out much heat on purchase ln June 2019. On July 2019 I see in a thread about a coolant leak I changed the thermostat housing with thermostat and commented that the heater worked better.
'Thanks to all for advice. On removing the thermostat it was clear from rusty lower screws and the appearance of the thermostat holder face that the thermostat gasket had been leaking (right again Doc), so I merely replaced the thermostat in holder. I drove the car 150 miles yesterday, no coolant loss, and now the heater works.'
Then followed more work on the coolant leak about the oil cooler, which I eventually cured, now the heater no longer works at all. Curiouser and curiouser.

[Doctor Gollum]

Did you plumb it in the right way around?

How much sealant did you use?

[terry paget]

Did you plumb it in the right way around?

How much sealant did you use?

I think it's plumbed the right way round, but I am not sure now. The two hoses to the pipes to the matix are interchangeable, and I could not see it mattered much.Does it?
I used no sealant.

[Doctor Gollum]

I meant the oil cooler connections

[terry paget]

I meant the oil cooler connections

The coolant connections to the oil cooler had to be right, one end to the thermostat and the other to the water pump. I used new 'O' rings, possibly with  a lick of grease, and the seal is still holding coolant.

[Doctor Gollum]

Obviously something happened in the course of fixing the oil cooler.

Any plugs left in?

[terry paget]

Obviously something happened in the course of fixing the oil cooler.

Any plugs left in?

Fascinating theory, Doc. I thought the pipe from thermostat to water pump went via the 'T' connection to the oil cooler, then on to the water pump. There was a pipe from the water pump direct to the heater matrix, then it went to the thermostat, then either to the oil cooler or the radiator. Am I confused? I can see this might be my problem.

[terry paget]

I have just checked; from a cold engine start, as coolant temperature reaches 190 after 9 minutes idling, both pipes to the heater are equally hot. I cannot imagine what went wrong when I changed the 'O' rings in the oil cooler section that could cause the failure of the heater.

[terry paget]

Standard basic aircon then

Try this (presuming fan working as intended)...

https://www.vectra-c.com/forum/showthread.php?200313-Heater-not-getting-hot-just-blowing-cold-air

Glovebox removal is only 4/5 torx screws iirc

this thread from the Vectra C forum concludes that if both pipes are hot then the matrix is not blocked, and the fault lies with the flaps inside. My pink lever certainly moves as I turn the temperature knob, engine running, but this has no effect on the heater output.

[terry paget]

The hoses from the thermostat are connected the same way as on my other Vectra. Both pipes to the matrix get hot, which suggests the matrix gets hot too. The car has aircon fitted (no longer functioning). I suspect the flaps which mix the air from aircon and heater matrix are misbehaving. The recirculating air valve servo motor and linkage seem to be OK. I am out of my depth here.
Meanwhile all my three Astras have passed their MOT tests, so this wretched car is a spare. At a pinch concentrated winter screenwash, aerosol deicer and a pair of gloves, would make it useable for local runs.