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#1 2024-06-18 17:27:05

RegW
Member
From: Bristol
Registered: 2024-04-21
Posts: 92

heater core decrap

This week I are mostly been reverse flushing the heater

I cut into then added a straight coupler to the supply pipe
so the pump is pumping out of the heater supply pipe
to the bucket the gets sucked back into the core via the out pipe

I used a whole bottle of Wynns snake oil on the bugger and added few kettles of boiling water to try get some de-crapping action going.
I'm currently cycling a few minutes of circulation and letting it soak for 10 then more pumping and so on
its been an hour or so and soon I'll swap it all for clean water.

I'd flushed the cooling system previously but wasn't sure the Holts jollop
was getting into the heater core, so trying this method.

It's definitely circulating and quite well too but not sure how good
it should be and what flow rate to expect from this cheap Ebay pump
I'll try and evaluate this when rinsing

heaterflush.jpg

Last edited by RegW (2024-06-18 19:37:36)


When all else fails, RTFM

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#2 2024-06-18 19:38:06

RegW
Member
From: Bristol
Registered: 2024-04-21
Posts: 92

Re: heater core decrap

Well after rinsing the bubbly stuff out, the flow from the drill powered pump
didn't look that good so got the hose out and flusheD it one way then another.
This seemed to dislodge a load of brown crap which was encouraging
and as the water cleared there were still gritty looking particles in it
so I kept going until I saw no more particles.
Result? time will tell but I have system now if I have to do it again

I'm currently running the motor to warm it up, check for leaks and and burping it.
the temp gauge is currently at 65 and the heater has been putting out hot air
consistently for 10-15 minutes with no discernable drop in temp
so that's very definite improvement!


When all else fails, RTFM

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#3 2024-06-18 20:14:32

AlvyLad
Member
Registered: 2021-06-11
Posts: 414

Re: heater core decrap

wow, the coolant must've never been clogged and then a bit.
VV nice pumpy thingy.

that sort of clogging up is impossible to achieve if you try... or easily achieved, if you'd add rad sealant x2 or x3 times, what's recommended OTT and leave it  "as is"

"holds few things crossed" for you to NOT to find leaks, something like in a rad, where welds are or else, due to "unnatural" jam you had in there... and believe you me I had bangers in my time, but never anything like it glasses

Last edited by AlvyLad (2024-06-18 20:15:04)

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#4 2024-06-18 22:11:03

RegW
Member
From: Bristol
Registered: 2024-04-21
Posts: 92

Re: heater core decrap

Been on a shortish run and all's well so far
Nice to have a heater that will actually heat when I need it to.

I did the pipe mod a while back and tried to use a hose to flush it
then but it didnt have much if any effect.
I reckon the 1.5 hr soak and circulation of the Wynns probably softened it
prior to the hose flush


When all else fails, RTFM

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#5 2024-06-18 22:17:09

kenbw2
Administrator
From: Preston
Registered: 2017-11-26
Posts: 1,301

Re: heater core decrap

Damn, I tried my best flushing out my white van's heater matrix but not to this level, sounds like there was hope for it after all. Would've helped on my long cold drive to Germany in December


2000 Citroen Dispatch 1.9TD XUD9 Camper Conversion
1999 Citroen Dispatch 1.9D DW8 Disassembled Camper Conversion
1996 Peugeot 806 1.9TD XUD9 Spare vehicle
1998 Citroen Synergie 1.9TD XUD9 Snapped timing belt

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#6 2024-06-22 01:32:57

JohnDragonMan
Member
From: Derby, East Midlands, UK
Registered: 2020-06-02
Posts: 411
Website

Re: heater core decrap

yeah ive had heater matrixes that clogged up with "head gasket fix" and all the oil in coolant that goes with a blown head gasket the thing had no flow at all through it.

my fix was to do what you did..  but use pure petrol.  that removed pretty much all of the oil. and the best thing with petrol is it just evaporates away leaving no trace.. given you rig up an air line blowing through it for an hour or so. (till the petrol smell goes away).
i cant say it will do the seals much good, but a life of living with oil over them over a few minutes of having petrol over them has to be better.
heaters never worked so good after! got fll flow back.  i ended up flushing the rest of the engine with neat petrol too. cleaned it right up.

i have also used dish washer tablets in the past too. in the summer drained all coolant and flushed a few times with water, then filled it up with water and dropped a few ground up dish washer tablets in the header tank.. driven it around for a few hours or to work and back a few times then drained the water and flushed loads of times. the crap that came out on the first drain was nuts!


- JohnDragonMan
Notice: I have the tendency to void warranties, blow fuses, cause fires, and other fun stuff.
Words of wisdom: Internally rust proof the sills and subframe! both skins!!. There's always user serviceable parts inside. "Oh that shouldn't have happened".
My 2005 Dispatch Camper Project big_smile

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#7 2024-06-22 12:18:45

RegW
Member
From: Bristol
Registered: 2024-04-21
Posts: 92

Re: heater core decrap

Petrol? compressed air ?  yikes
Way too risky for me that is lol
I understand petrol will dilute oil but there are safer options.
I didn't notice any oil anyway just years of slowly accumulated crud and crap
in the rusty looking soup

The heater seems to be working well at the moment but I have no criteria tell me
what to compare it to.
If I think it could be improved and with the coupler in place, I can easily use the same method again in the autumn


When all else fails, RTFM

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