ive been having a few problems recently with overheating . the water pump started to leak , so i changed that and the belt and put a new thermostat in it while i was there.

now after all that its still overheating.

ive removed the thermostat completely and it now doesnt over heat but the gauge reads next to zero temperature , sometimes moving up to the half.

any ideas what the problem is

 

air lock in the system maybe?

 

when you put the new pump in did you make sure it rotated cleanly both ways without friction?

I recently did mine with the engine in the car and the gasket got caught when I put the new water pump in. Result was the pump wouldnt rotate freely. Luckily I checked before I did the belt and tensioner!! lol

Failing that, when I got mine back up and running it did overheat at first (have power fc and commander and temps was in the high 90's initially) but took it for a run and it soon settled. checked to top it up the following day when cool

 

ive drained it , refilled it lots and lots of times . making sure there are no air locks., the thing is ive tried to different thermo stats.. and it makes no difference at all . with a thermo stat in it overheats, take it out and it doesnt ,
i just cant understand it

and yeah i checked the waterpump as i put it in

 

I have exactly the same problem and I have even had it chemicaly tested for head gasket failure and it passed, but garage is convinved it's the head gasket!

 

yep ive had mine tested for it also and both times they say it cant be .

 

and the heaters will only blow warm air , not hot .. they will blow cold tho .

it does seem as if its airlocking , but there is no way it can be . lol

 

[QUOTE=uk_scoob;7291808]and the heaters will only blow warm air , not hot .. they will blow cold tho .

it does seem as if its airlocking , but there is no way it can be . lol[/

my heaters blow hot until the water level drops!

Can still be HG it might only do it under heavy boost!

 

but then explain why it doesnt do it while its not got the stat in it . this is what i dont understand..

the fact it doesnt do it when the thermostat isnt there suggests to me that its a problem with the thermo stat, but ive changed it twice .

 

Dont know mate think we need an expert!