Wet heating. Change to volvo fluid

[green van man]

Well I finally got around to changing the antifreeze in the caravan wet heating system for volvo coolant.
My research tells me that the normal fluid is a 50/50 mix of G12++ or G13 which lasts 5 years

Everything I could find out and was told about volvo coolant indicated that it was equivelant at least and it's longevity was far better.

In order to do the job I bought 8l of volvo antifreeze,
20 l of deionised water,
A 12 submersible pump,
5m of clear 20 mm bore clear plastic pipe
2x 15 to 20 mm end feed copper reducers
A couple of jubilee clips.

Started by draining the header tank and removed it.
Turned the circulating pump by the boiler to max.
Connected the 2 clear plastic pipes the one connected to the 12 pump to the boiler feed, the return to the other pipe that was directed to a catch bucket outside the van.

Turned the circulating pump on permanently via boiler control panel , submerged 120 pump in clean water and switched it on.
Cept it running while topping up the bucket with clean water untill the liquid running out the return pipe was clear of any colour, indicating all old fluid removed. Gave it a Cople more miniuts to be sure.

Turned everything off.

Mixed volvo fluid with de ionised water 50/50 12 l in all.
Submerged 12v pump in volvo coolant and repeat process untill green volvo fluid running out the return pipe.
Turned everything off.

Refitted header tank and filled with volvo fluid mix.
Started the circulating pump and ran it on high setting while watching header tank. This blew a lot of air out of the pipes and vented it to the atmosphere. Stopped pump, topped up header tank, turned circulating pump down to normal speed and turned it on. Opened bleed valve untill coolant flowing out. Checked header tank, Refitted cap, turned heating on and check pipes as they heated.

All told perhaps 2 hours work

Costs,
8 l volvo antifreeze £36 from on line volvo dealer
Deionised water 20 l £13 from eBay
12v pump £18 from eBay
15 to 20 mm reducers £5 from screw fix
Jubilee clips £3 from screw fix. Note, this was the cost of a pack, I only used 2 so have spares to go in the box now.
20 mm bore food grade plastic pipe £5 from eBay
UK
Buckets and mixing jugs I had already

Total cost £63.

Mobile man that services the van wanted £300 and would only use 5 year G13 antifreeze. Which he admitted he bought from euro car parts

My plan is to test the fluid every year and suck a litre out of the header tank every couple of years to be replaced with neat new volvo antifreeze if nessesary.

Hope that helps other cheapskate caravaners like myself to save some money and continue to do so by doing away with the 5 yearly fluid change.

Paul.