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Discussion Starter #1
My wife's 2011 (lastest style model) heater isn't giving out any heat.

Can any point me in right direction to start looking?
Is the heater circuit permanently circulating hot water and the temperature controlled by a flap to blend hot and cold air?
Saying that I have foot well panels off to see ventilation unit and can see water pipes and when engine started up one pipe soon gets warm but the other stays cold. But for one to get warm there must be water flow so where's the warm water going?
Peter
 

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Discussion Starter #2
My wife's 2011 (lastest style model) heater isn't giving out any heat.

Can any point me in right direction to start looking?
Is the heater circuit permanently circulating hot water and the temperature controlled by a flap to blend hot and cold air?
Saying that I have foot well panels off to see ventilation unit and can see water pipes and when engine started up one pipe soon gets warm but the other stays cold. But for one to get warm there must be water flow so where's the warm water going?
Peter
Update; Should have waited longer as hot water going in and out of heater so must be a flap not opening. I can see mechanisms and levels on left (glove box) side but don't seem to do anything or move pressing any of the ventilation controls so is that the issue?
 

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Discussion Starter #3
Flap that actuates hot air control now seems to be moving and so have hot air. I just jiggled it a bit so may be flap stuck
89895

So first problem seems to be solved.
Then noticed that control to send air to windscreen/vents/feet also not working. It seem to be a similar motorised unit but driving big wheel and levers
Cant see how you remove this part with out taking out fan motor
Anyone done this before?
89896
 

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I find the heating/climate controls on my meriva 'S' 2011 are pretty unintuitive. AFAIK The flap that directs air to the screen and small side window vents can be operated either by switching the demister button on, or via the upwards arrow button in the central control panel (AC on or off)...since you seemed to rectify the first problem by prodding things, try pushing various buttons in combination before resorting to more drastic measures. I don't know what Vauxhall technicians were thinking when they devised this system. The irony is the car seems to take an age to warm up and demist, and AC on by default is a criminal waste of fuel (assuming many people will forget to turn it off). While the mouldings are off it wouldn't do any harm to squirt some silicone lubricant on any obvious mechanism.
 

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Discussion Starter #5
Spoke too soon heater not working and very very luke warm. Water system all up to temperature and when you feel the metal heater pipes going in to heater one is hot to touch but the other is cold. How can that be you need a flow of water to get the one pipe hot and with no heat coming out how is other pipe cold.
Is there a separate electrical pump to pump water around heater circuit? If so where is it?
Is there any where I can get hold of a work shop manual to see how the plumbing and electric work?
 

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Discussion Starter #6
Spoke too soon heater not working and very very luke warm. Water system all up to temperature and when you feel the metal heater pipes going in to heater one is hot to touch but the other is cold. How can that be you need a flow of water to get the one pipe hot and with no heat coming out how is other pipe cold.
Is there a separate electrical pump to pump water around heater circuit? If so where is it?
Is there any where I can get hold of a work shop manual to see how the plumbing and electric work?
Here is what heater matrix looks like so can only think not enough flow though matrix so must be a pump in the circuit that's not working
90643
 

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Sounds like the heater matrix is blocked, which is why you have hot water getting to it but not entering it.
Try reverse flushing it with a garden hose.
 

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Discussion Starter #8
Not sure about reverse flushing as wouldn't go from hot one day to not working the next and modern cooling systems stay very clean and don't get corrosion in them
I still would like to see plumbing and electrical circuits so see the set up. Old cars were simple you had one water pump and a simple valve operated by a cable to control the flow on hot water through the neater matrix. Modern cars can have various flaps controlling the air flow though the heater matrix to blend hot with cold air and could have auxiliary electric pumps and valves controlling the flow of water through the matrix. I just need to understand the set up rather than blindly trying X, Y and Z hoping for a fix
 

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Not getting very far on solving this one so I've been driving car to see what happens.
From cold the temperature gauge rises to normal quite quickly but no heat from heater. First part of my journey to work is stop go in traffic even on motorway but once you go consistently between 2-3k revs heater blows hot air. If you have a period in slow traffic it runs cold again.
Also noticed radiator fans are on if slow from higher speed more than I would expect though in other cars they may be on but just cant hear them.
Finally Temp gauge is rock steady on normal most of the time but occasionally rises a bit and then falls back to normal in a matter of less than a minute. I haven't worked out the circumstances when it rises but in my insignia the gauge never moves once warmed up even when towing up hill on a hot day!

What does all that mean? Is it a mechanical water pump on the 1.4Turbo?
 
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