 | Home > Maintenance & Modifications > Holts Rad Flush- Any experiance? |
 
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| shaggydog Member Since: 12 Aug 2012 Location: Kent Posts: 3347   
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Hi Guys,
As the summer is now well and truly dead down here (heating is on, stew in the oven, girlfriend in fuzzy jumpers) I thought it good to sort out doing a coolant flush on my 200Tdi as a last chance thing before resigning myself to doing the head gasket. So bought Holts 2 part rad flush as it was recommended to me via here. However, the instructions are a bit unclear and sound like it will do more harm then good. Part 1; 1. Thoroughly drain radiator and engine block, flush with cold water. 2. Refill with water and add part 1 to system. 3. cover filler pipe with damp cloth.nb, for systems with an overflow tank replace cap on radiator and cover overflow tank opening with the cloth. Product should not be added to expansion tanks but directly to main system. 4. Run engine at fast idle for 30mins- do not allow to boil? 5. Switch off engine and drain radiator and engine block and flush thoroughly? 6. Refill with hot water. 7. Run engine for five minutes on tickover before using part 2. Part 2; 1.Refill system with cold water and pour contents in radiator 2. Cover filler pipe with a damp cloth 3.Run engine at fast idle for 15mins- do not allow to boil 4. Switch off and drain radiator and engine block 5. Flush system thoroughly, by removing thermostat and directing clean water into thermostat housing, so that it circulates in a reverse direction through the engine block then up the radiator and up out the top hose. 6. Continue until the water runs clear Now, seems simple enough but what worries me is the draining hot coolant out and then putting cold flushing water back in? Surely that's a recipe for thermal shock or warping your head or cracking it? Also, how can you make sure your coolant doesn't boil? And when it says put a damp cloth over the filler, does it mean don't allow the system to pressurise? Wont that do damage? Any pointers welcome- I may just be over thinking it  Running Restoration Thread http://www.defender2.net/forum/post323197.html#323197
Self confessed mileage hunter  |
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6th Sep 2015 11:04am |
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| shaggydog Member Since: 12 Aug 2012 Location: Kent Posts: 3347
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Anyone?
It doesn't sit right with me to be flushing a hot engine with cold water - or am I being over cautious? Running Restoration Thread http://www.defender2.net/forum/post323197.html#323197 Self confessed mileage hunter |
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7th Sep 2015 12:26pm |
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| Happyoldgit Member Since: 14 Sep 2007 Location: Norfolk Posts: 3471 
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Deleted. Steve.
Owned numerous Land Rover vehicles of all shapes and sizes over the decades. Current Defender: A non tarts hand-bagged Puma 110 XS USW. [Insert something impressive here such as extensive list of previous Land Rovers or examples of your prestigeous and expensive items, trinkets, houses, bikes, vehicles etc] http://forums.lr4x4.com I used to be Miserable ...but now I'm ecstatic. Last edited by Happyoldgit on 8th Sep 2015 10:54am. Edited 1 time in total |
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8th Sep 2015 9:45am |
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| rfkdemon Member Since: 02 Apr 2015 Location: Staffordshire Posts: 64 
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It isn't a magic head gasket repair, it simply flushes any deposits that have built up in the coolant system over the years. The hope being that the cooling system will work more efficiently. Hence why I used it myself after doing the head gasket to make sure the coolant system was all in order
I agree, those miracle HG repair fluids are a waste of money, unless you simply need to get home. They end up causing more harm than good unfortunately. Matt |
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8th Sep 2015 10:41am |
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| shaggydog Member Since: 12 Aug 2012 Location: Kent Posts: 3347
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The reasoning behind it being is that every pic I have seen of a 200tdi head fresh off the block is that the coolant gallery between the cylinders is blocked.
If it is blocked then there could be a lack of coolant in the head which is causing it to create a hot spot and when the engine is turned off it is boiling and then venting through the cap. I haven't flushed the engine or coolant for 3 years at least so its probably due one anyway (and as I found out isn't part of a service coolant change  )
Sound reasoning or ridiculous lip wiggling? Running Restoration Thread http://www.defender2.net/forum/post323197.html#323197 Self confessed mileage hunter |
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8th Sep 2015 10:45am |
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| grumpy old git Member Since: 16 Nov 2013 Location: United Kingdom Posts: 153
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I did my old Td5 disco and SWMBOs 300tdi with it, to be honest the drained water wasn't that hot and I left it to cool before filling and flushing. Each time was a leisurely process carried out over the course of the day around doing other things. That was some times ago and we've had no issues
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8th Sep 2015 8:03pm |
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