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[Gubz]

Hey folks my heaters seem to have went, it blows cold air nearly 24/7 only a small amount of heat, an i do mean very small an it only last 4 a few seconds, any ideas??

[Jimbob]

try disconnecting the hoses that enter the bulkhead, then flush and reverse flush the heater matrix (hose pipe just pushes on to the conenctors)

[Mike Collins]

Don't be misled by the ease with which water flows through the matrix using a hosepipe. The coolant pump has very little ability to overcome a restriction in the core.

Try connecting a length of pipe to one stub, leave the other stub open and blow down the pipe. If you feel  a resistance the matrix is probably choked. Don't swallow anything!
Changing the core is not an easy job.
After I replaced mine I tried compressed air through the old one, that cleared out some debris, seemingly without damaging the matrix.
If you're feeling brave......, but make sure both stubs are disconnected.

[Boracic]

Is that with ir running in Eco mode, or with the compressor running? Or both?

[bigdods]

Before doing anything set the climate control to HI and see if you now get hot air. If you do it could be a problem with the sampler fan in the cabin.

[Andy B]

Whar about vacuum to the heater by-pass valve. I don't know which way round it works ie does vacuum give heat or not heat? :-/

[Gubz]

ok just an update i've flushed the water system an nota little bit of difference!! Next up take out heater matrix:-(

[The Red Baron]

Before doing anything set the climate control to HI and see if you now get hot air. If you do it could be a problem with the sampler fan in the cabin.

check that & clean, also check that the vac pipe is still connected to the hbv. i wouldnt go ripping the matrix out just yet. its not a nice job.