help with cooling system

[skooshy]

right guys i changed a water pipe at the rear of the head to the heater matrixs now the temp gauge is going through the roof....

ive checked the thermostat its working
just feels like theres no water in the main water pipes (top and bottom rad hoses)

can any one help

ive tryed the bleed screw on the the housing it runns out for like 20 secs then stops then i need to rev it to get the water out of it again.....

[TPS]

Does the Heater blow out Hot Air? What Engine is it?

[skooshy]

yeah mate heaters are roasting its 325i sport m20 engine

[TPS]

It sounds like it needs bleeding, they can be swines to bleed sometimes.

[skooshy]

any tips on how 2???

[TPS]

I read this, & it solved it for me:-

http://www.e30zone.net/modules.php?name ... em+problem

[skooshy]

woo hoo sorted this morning .... turned out to be the brown temp sensor on the thermostat housing

went out to it this morning and the temp gauge was showing half temp and that was from stone cold......

[Brianmoooore]

Not impossible, but very unusual if it is! Have you compared the resistance of the old one and a new one with a meter?

[skooshy]

nah i didnt mate but ive been driving it all day the day and its been spot on not over heated and water level is still spot on ....

so brown sensor changed and spot on .....