hi guys changed my heater matrix this wk 9 end 94 sti as the old one was leaking bad.sourced one from a scrapyard no leaks on it seemed ok.got dash all bk together today warmed car up no heating at all coming out of vents.tried bleeding it using drain screw on rad while hose pipe in header then put the plug bk in while water was runnin thru not sure if this was rite way? still no heating tried filling it with pipe from block to rad still no joy they even seems to be hot water in the heater matrix ? could the matrix i got be a dud i thought the only problem u can have with a heater matrix is it leaks am i rite ? plzz any help guys would be ace im really lost on this and pi__ off the car does not overheat either had it runnin right untill the fans come in.

 

Check the thermostat, or even replace.

 

u reckon thermostat mate then was fine before tho ?

 

For a couple of quid and 10 mins, it's worth doing.

 

yer ur rite mate im just hoping its not the heater matrix surely there only leak wen there fooked.?

 

If the matrix is getting hot, have you got the vent controlls connected properly???

Does it blow cold air out where it should when you change position on the controll??

Ady.

 

yer mate it changes fine to window and to feet and all the other settings.im lost as to y its like this? thermostat or air lock im guessing?

 

anyone ??

 

Did you change just the matrix or the complete unit?
Maybe you have a duff servo that controls the hot to cold adjustment.
If you've still got the old complete until try swapping over the servo (2 philips scews)

Air lock would give you overheating problems & similar symptoms to cold air blowing through the matrix.
Try feeling the 2 water pipes that lead to the matrix to see if both a warm/hot to touch.

You will need to drive the car to really see if it overheats, I had similar issue where there was no hot air blowing through matrix, temp gauge seemed ok until a quick drive around the block & the temp gauge shot up to red.

Basically mine had a air lock.
I removed the small pipe that leads to the top of the rad, then filled the system with water until it flowed out of the small pipe. I also removed other water pipes & filled the system where I could. Started the engine until temp gauge reached normal. Then once it cooled down, I left the rad cap off overnight & in the morning I could see the level had dropped, refilled & test drive, had no problems touch wood.

ticky

 

hi tricky no i just changed the matrix its self.were will i find the servo.? whats it look like.thanx

 

passenger side under the matrix its self is two plugs to turn it from hot to cold just check they are both working and moving when you turn the *** if not then chances are the heater is set to cold and no power geting to motors to turn it

 

sorted guys it seemed when the old matrix was pissing out water it dripped down onto the the motor that operrates the hot and cold.anyways this is seized so need a new one.so problem solved.having this site really does make problems easy to solve. thanks guys and girls