Jump to content

To flush or not to flush....


Recommended Posts

As part of my restoration and overhaul of my 44 GMC, I am debating whether or not to give the cooling system a full flush with an additive to give it a good clean out. I've never had any problems with the cooling system in the three years that I have had the truck and I've been assured that the rusty looking water that courses through the system isn't anything to be alarmed about.


However, I would like the peace of mind that all the fluids are tip-top but I've heard a couple of horror stories about people flushing their systems only to find that the core of the radiator has been wrecked in the process - I suppose this would suggest that it was on its last legs anyway but I'd appreciate any advice - should I do it at all, what additive if any should I use etc etc.


Thanks in anticipation

Link to comment
Share on other sites

I guess some flushing additive might potentially cause damage to the rad core but as you say it only finds weak spots which would eventually fail. I've used additive on a couple of occasions without problems, but admittedly the radiators were in very good condition.


Best way I've found is to constantly alternate between flush and reverse flush with a really good flow rather than just one way flush. It seems to be this flow reversal which does more to dislodge accumulated deposits than anything. And keep at it - it took 1/2 a day to clean out a Rolls C6 diesel block and cooler - I couldn't believe the almost constant flow of rusty water!!!


Of course a good flow helps - a 1" hose on my 6" water pump gives a marginally better flow than a domestic tap :D But I'd certainly stick a pressure washer outlet on the block - just be gentle with the radiator!

Link to comment
Share on other sites

I'm just making up some adapters for my Power Flushing Machine I use in my business, it uses a high volume, low pressure pump with reversible flow & hot or cold descaling chemicals. it flushes straight to drain & any metallic particles are caught by the twin magnetic filters.. I can descale & clean a complete central heating system in about 7 hours so should work well on a vehicle...



Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

  • Create New...