Cooling water circuit diagram

[Gavin]

Does anyone have a water circuit diagram for a mk7?

I've bought an engine preheater and i'm not sure from the instructions which pipes to fit it between. Any help appreciated.

Ta.

[dumper]

The d5w they fitted to BT mk6 vans were Tee into both heater pipes

[Airthies]

Ive plumbed my D10w into the heater hose from the cab to engine, so mine runs in a loop from D10w to engine, to cab heater, to rear matrix, back into D10w.

It's the best thing you'll fit
Love conning out on cold mornings to a warm defrosted van with the engine sitting at 60+Deg before I turn the key

What was the heater out of or was it new?
Depending if it's out of another vehicle some are controlled by the vehicle ECU so they won't work with a standard controler. But have heard of others using a raspberry pie or similar to fool the eberspacher ECU.

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[Airthies]

I cut and looped it into the top cab heater hose.
And mounted it in the back under the bench with its own matrix to warm the rear.
Works a treat

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[Gavin]

Thanks guys, it's just a cheap chinese one off ebay, but it looks better than most, has a bulkhead mounted socket and 2.5m mains lead with a matching plug, which should be more practical than the flying lead that the others have.

Going to mount it up tomorrow. I do lots of short journeys and it barely has time to get warm, i think that's what helped kill the last engine.

[Airthies]

Ah... a block heater. Was automatically thinking of a diesel one oops

We had similar things on some machines too and they work well enough. Depending on it's power output etc.
But having a warm block before starting is always going to be a good thing they're all the rage in Scandinavia
If you plug it in when engines hot is best.
Looking at the plug is it the right voltage? Just all the ones we had were 110v AC from the states.

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[Gavin]

It's 240 volt just got a euro plug. It's 2.2kw.

I fitted it behind the LH headlight, found a mounting hole in just the right place, tapped it into both heater pipes just above the thermostat housing, and ran the power socket to the blanking plate for the LHD wiper position just below the windscreen. Couldn't have been simpler, almost as if it was designed to be there.

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[Airthies]

Looks neat be good to know how it goes

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[Gavin]

Well it works, but not quite as well as i'd hoped. The pipe off the heater outlet gets nice and hot in just half an hour, but the return pipe isnt that hot and the engine doesnt seem to get that hot either. The internal thermostat trips it off before the return water is warm, so it seems if the water isnt circulating through the engine properly.

It is quieter in the mornings and there's instant warm air from the vents.

Not sure why it's not circulating as i've tapped it into the cab heater hoses as per the instructions.

Really need a water circuit diagram.

My gut tells me it really wants to go in the bottom of the engine and out the top.

[Airthies]

Thinking about it if you've done the same as me then your trying to heat the cab as well as I said I thought it was a diesel one and those you can use to preheat the cab too.

For yours I'd be looking at the likes of the oil cooler for one port and then the likes of the engine outlet too the cab heater (rather than from cab in my pic).
You'd need to tee into those lines and possibly fit a one way valve for when engines running it will still feed cab heater matrix?



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