Cleaning a heater matrix.

The cold weather has shown just how poor the heater in the old Rover has
become. It was very good when new.
Coolant temp is normal.
It is a major job to replace it, so any tips for a decent chemical
cleaner?
Not keen on using one which simply goes in the coolant, but it is quite
easy to disconnect the hoses to the heater and use some form of chemical
just in it. It is copper, with IIRC steel pipes feeding it.
I did try reverse flushing it without success.
Was wondering about a couple of plastic bottles which could be fitted to
the hoses - one of them open at the top. So you could sort of slosh the
chemical back and fore in the matrix? Can such a thing be bought - to fit
the usual 1/2" hose?
Or any tips?
Reply to
Dave Plowman (News)
Don't forget that there are rubber seals inside the car on the heater pipes, whatever you put in must be safe with those seals. I like the idea of a back and forth motion of the fluid, whether central heating system cleaner would be safe? Read the bottles, but they should be safe, logically, since ch has rubber, copper and steel components..
Reply to
MrCheerful
When power flushing CH radiators they often vibrate the radiator to dislodge any crud. You may be able to achieve similar with a sheet sander (without sandpaper) by operating the sander in contact with outside of the heater matrix.
Reply to
alan_m
That would not be possible, the SD1 heater matrix is completely buried, removal or access involves taking all the interior forward of the seats out, start with the steering wheel, quite literally.
Reply to
MrCheerful
What about a water pump that is operated by an electric drill (£7 to £8 on Ebay), You could the pump any cleaning solution around for hours, occasionally reversing the direction. Intermittently pumping and leaving to soak may be better. If the feed and outlet were open ended hoses into a reservoir bucket you could see a change in the colour of the water when any cleaning agent is working. .
example
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This one seem to be able to take fittings for a 1/2 hose
Reply to
alan_m
I doubt you could with an electric drill. That?s not the kind of duty cycle they?re designed for. Those pumps are also serious naff in terms of output.
Tim
Reply to
Tim+
Actually, the output on that eBay one actually isn?t that bad but it?s still a bad idea to run a drill continuously for hours. If it?s just to circulate cleaner/descaler a cheap submersible pond pump would be fine for continuous use.
Tim
Reply to
Tim+
Make sure the heater "heat" is on max. Some heater matrix have a tap on them, only fully open when heat is on max.
A bit of dishwasher tablet?
Those plastic bottles come in 0.5L, 1L. 1.25L, 1.5L, 2L and 3L. 2L and 3L will be bit unwieldy. Usually have other product in them. I would suggest 1L flavoured water from Aldi, still or sparking, 33p/L, bottle has nice shape for grip. Make the fill/vent hole in the bottom (top when used for flush) small or the structural integrity will be poor. Build the hose up to size of neck with insulation tape or glue them on to hose with silicone sealant.
Reply to
Peter Hill
I've got a WW2 stirrup pump that could do that.
What you need to get aerated fluid to rattle through it at a reasonable velocity. The meniscus effect of the bubbles is quite good at scouring away any loosened crud.
Reply to
Andrew

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