Joe Romas wrote:
This might sound like a stupid question but why should a properly maintained cooling system have scale and need flushed
A 05 CRD is just now 5 years old and that's when the coolant should be replaced. My 06 was built in January 06 so I completly drained and refilled when I put my new oem thermostat in 2 weeks ago. It took exactly what the book calls for so I know all the old was drained out. I've more or less always changed the coolant as called for and the only radiator I ever had clogged ws on the outside by bugs
VW calls for a 10 year change on the 99 jetta (a4) TDI that that I bought new and my son has now. We drained and refilled it when we changed the timing belt and water pump for the second time and it's never overheated
Don't they just monitor the chemistry of the antifreeze on over the road trucks and adjust it as necessary?
Does not scale come from the water mixed with the coolant and isn't that why distilled water is called for? It's $1.39 at my local CVS drug store.
I agree. I have always changed my coolant every 5 years (the wife's Audi, every 3). Wow, 10 years for VW? And I only use distilled water for a 50% mix. So far no scale that I am aware of.
But others swear by flushing. Heater cores are problematic for scaling. It is nice to flush the oils out before adding new coolant. Maybe someone here can add insight to this.
I just thought that this was a cheap mod, can't hurt to fully flush out the system and I didn't see anyone on the forum doing it yet so I am posting what I do.