Basically saturday my car decided to boil itself, the cause, plastic impellor broke up in the waterpump, but i turned it off straight away, and it hasnt been ran for more than 30seconds to a minute whilst it was overheating.

YEs its a ford 2.5 V6 as found in the ST24 etc.

I replaced the thermostat and the waterpump and all was well, did 50 miles and the needle didnt move up further than past the 1/2 mark on the temp guage, sat between the R and M of the NORMAL

Today i decided to give it a blast down a lane on the way to supermarket, it moved a little past the M towards the A (today is hotter day yesterday it pissed down all day and was very mild) got into supermarket and fan was on, so had a look under bonnet and noticed water seeping out of the header tank, so i slowly undid the cap expecting it to erupt but it didnt, it hadnt over heated and once i took the cap off the fan went off, then whilst the cap was off some 2 minutes later, the fan kicked in again and this time it erupted and dumped a good load of water straight out the header tank all over the car park much to 20 - 30 peoples amusement

Turned it off and left it to cool down, did my shopping, came back out was going to top the water up but it was still on between minimum and the max so it hadnt lost a lot considering the amount it spat out, so then i thought maybe id put too much water in it?

So just put the cap back on, drove back, and all the way home, it went from between the halfway mark (R-M) up to between the A-L ,fan going on, off, on off, even when driving, gently around 2500 revs down country lanes, temperature guage is going up and down, also noticed the heaters were going hot, cold, hot, cold

Came home and took the cap off again, let the fan kick in again, and again it erupted all over the driveway, everytime the revs climb, the water in the tank climbs until it spews it everywhere.

Also when i first got back and opened the bonnet it was burping and farting a good en out the header tank, then made a really loud burping noise when i opened the tank cap again before it erupted.

Is this air lock, or is it knackered? I couldnt find a small fragment of the old plastic impellor, could this be causing an issue somewhere?

Just find it odd how it was fine for 40 -50 miles, a 30 mile stint at 70mph down the M1 but now its being a nob again, someone help before i put my foot through the screen