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[SnakePliskin]

Hiya all

I think my auxillary water pump is at fault for my heating issues as when i bypassed it the heating was luke warm. Im putting that down to the water passing through the matrix to quick due to no flow control.
NOW
When i had the pump out i wired her up to a supply and SURPRISE SURPRISE the pump doesnt work.
Would this be the issue if im right in thinking?

[Kevin Wood]

In my experience the pump makes no difference to the heating. It only allows "residual heat" from the engine to be used when the car is parked.

I removed mine entirely when I went to LPG and noticed no difference in heater performance.

Also, you can't have too much flow through a heater matrix. I would suggest, if performance of the heater is poor, that you have either a partially blocked heater matrix or the heater bypass valve is defective.

Worth getting some cooling system flush, running that through the cooling system and then refilling with a correct antifreeze mixture if it hasn't been done recently. Consider popping off the heater matrix connections at the bulkhead and reverse flushing it with a garden hose too.

Kevin

[SnakePliskin]

Heater bypass valve?

Any pics on a location or a way of testing?

[TheBoy]

Behind passenger bank of cylinders.

pull the vac pipe off it, see if that improves heater - seen a couple now where the vac is always present!