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Discussion Starter #1
Had to take the turbo off the other day on my 308 thp. There is water feed to the turbo and some of the water came out.

Filled up the tank and then started the car.

All good until yesterday when it was freezing and wanted the heater on. BLowing cold air and looking at the temp gauge, it goes up to 90 then drops down to 80 and then goes back up to 90 and comes back down again!

Thought maybe it is air lock in the system? Took half the car apart to get to the bleed valve, cursing peugeot all the way for putting it in such a f**** place, only to realise it is not on the side of the thermo housing, but on the top and you get to it from the top and not side!

So let the engine warm up, loosened it and let some water out. tightened and then ran for a while and loosened again and ...

Now the temp is not doing the yoyo anymore, but the blower seems to be still cold!

Wondering if you need to be actually driving the car to push the water around the heater matrix? Would it not blow hot air with the car stationary?
 

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Discussion Starter #2
Took the car for a drive this morning, and the temp gauge is doing the same again! goes up to 90, then drops to 80 and then back up again.

Could this be a thermostat issue?
 

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Discussion Starter #3
Update:

Issue fixed.

The problem was the bloody heater matrix.

Having replaced the Thermostat it still did the same and with all air out all was the same.

So the only option was the matrix.

Took 45 min to do, but immediately hot air started to come out.

Strange as the matrix is clear and you can easily blow through it, but perhaps few of the fins are blocked and not working efficiently.

Matrix was £60 from Euro , plus £20 for anti freeze.
 
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