This is my first post on here so I'd like to say Hi to Alfa owners
I recently replaced the thermostat on my Alfa after spending a few hours on the hard shoulder one Sunday afternoon.
After fitting the new thermostat, I was careful when filling the cooling system, not to trap any air.
At first, the new thermostat seemed to do the job of keeping the temp at around 90, this is where the gauge always sat before it overheated.
After running it around at low revs, carefully warming the engine, I did a quick run down the motorway. As soon as it started to hit 4000rpm, the temp started rising to 100 - 120.
I pulled off the motorway and popped the bonnet. The top two pipes, from the tank and into the engine where red hot and hard under pressure, but the lower pipe from the radiator back to the engine was cold and soft.
When the engine is cold, the lower pipe feels the same, along with the top two pipes.
Since I replaced the thermostat, there also seems to be a slight misfire when I start the car.
Has anyone had this problem?
I really need to fix it as I need the car. I'm a pretty good mechanic so if it's the radiator, I can do that.
I'm just praying that it's not the head, one garage said it was, but as there is no oil in the water or sludge in the oil I think he's wrong.
Help Me Please