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Rear Heater Leak
Posted: Sun May 13, 2018 10:42 am
by stark
HI
I've got a leak from under the rear heater matrix. whilst one pipe is weeping slightly there is also what looks like an overflow pipe? which is basically piddling out whatever i put in the coolant header tank ( red circled on picture
https://www.dropbox.com/s/l33inbeyn6fyo ... 0.jpg?dl=0). sorry can't work out how to embed images
anyone had this before or know what is causing it?
cheers
stuart
Re: Rear Heater Leak
Posted: Sun May 13, 2018 11:30 am
by g8dhe
Its not overflow its to allow the condensation water out from outside the cooling matrix, if its flowing out of there it sounds like there is damage to the heating matrix or its feed pipes inside. If you have any side conversion then access nay be difficult from the inside, you maybe better off getting a bypass kit (I think the shop does kits) to bypass the system unless you replace the matrix itself.
Re: Rear Heater Leak
Posted: Sun May 13, 2018 12:04 pm
by stark
cheers, can't see any bypass kits on the shop though :/ perhaps i'm looking in the wrong place
Re: Rear Heater Leak
Posted: Sun May 13, 2018 1:11 pm
by TheLongRoad
Possibly this?
https://bongoland.co.uk/product/mazda-b ... to-aug-99/ Wonder if it fits the 99 onwards as well?
Re: Rear Heater Leak
Posted: Sun May 13, 2018 4:53 pm
by Roy748
Hello.
I had exactly the same problem with my rear matrix. My fix was to bypass the matrix using some 15mm copper pipe, 2 copper elbows, which come pre soldered so you just need to heat them with a blow torch to fit them. And finally 2 copper pipe joiners which go over the pipe (which insert into your rubber pipes) to give it the required thickness otherwise you will not be able to tighten the rubber pipes up enough to form a seal on 15mm pipe.
I refitted my rubber pipes to the copper pipe using jubliee clips.
Hope that helps.
Re: Rear Heater Leak
Posted: Sun May 13, 2018 4:56 pm
by Ian
Only fits pre-99 I'm afraid.
Re: Rear Heater Leak
Posted: Sun Sep 16, 2018 6:27 am
by TheLongRoad
Roy748 wrote: Sun May 13, 2018 4:53 pm
Hello.
I had exactly the same problem with my rear matrix. My fix was to bypass the matrix using some 15mm copper pipe, 2 copper elbows, which come pre soldered so you just need to heat them with a blow torch to fit them. And finally 2 copper pipe joiners which go over the pipe (which insert into your rubber pipes) to give it the required thickness otherwise you will not be able to tighten the rubber pipes up enough to form a seal on 15mm pipe.
I refitted my rubber pipes to the copper pipe using jubliee clips.
Hope that helps.
Currently working on my system and considering this approach to blanking the rear heater. Roy748 I’ll send a PM as I’ve a question
Re: Rear Heater Leak
Posted: Wed Sep 19, 2018 8:31 pm
by Diplomat
Roy748 wrote: Sun May 13, 2018 4:53 pm
Hello.
I had exactly the same problem with my rear matrix. My fix was to bypass the matrix using some 15mm copper pipe, 2 copper elbows, which come pre soldered so you just need to heat them with a blow torch to fit them. And finally 2 copper pipe joiners which go over the pipe (which insert into your rubber pipes) to give it the required thickness otherwise you will not be able to tighten the rubber pipes up enough to form a seal on 15mm pipe.
I refitted my rubber pipes to the copper pipe using jubliee clips.
Hope that helps.
Hello Roy.
Could you elaborate on 'copper pipe joiners'?
I will have a look under mine tomorrow and try and visualise your repair. If not I may have to find you in Kent and see how you have done it!
It can only be a matter of time before mine needs doing. I never use the the rear heater anyway, despite being a softie from the south.
The two caps with hose clips approach looks a lot simpler, is continuity of flow not essential, I wonder?
Frank
Re: Rear Heater Leak
Posted: Thu Sep 20, 2018 7:14 am
by fatcatlawyer
When the plastic slightly on my heater matrix broke I thought a new one was the only option. However my bongo friendly Polish mechanic said leave it with me I can repair. He did two or three years ago . Pm me if you think a trip to Chesterfield is worth keeping the rear heater functioning. No promises mind. A photo of what's left might help with a prognosis.yours Ian G.
Re: Rear Heater Leak
Posted: Thu Sep 20, 2018 7:22 am
by fatcatlawyer
Spiggot not slightly - bloody auto thingy. Ian G.
Re: Rear Heater Leak
Posted: Thu Sep 20, 2018 11:34 am
by TheLongRoad
Thanks fatcatlawyer. On mine the plasic spiggot has broken completly off. I'm doing the bypass trick and taking a new hose across the rear of the gearbox and joining onto the steel pipe on the passenger side. Having replaced the drivers side steel pipe with the T piece, I found the return steel pipe from the rear heater was also in a poor state. As I've a full side conversion I'm going to leave the rear heater where it is. Maybe I'll get at it if I ever have to remove the whole side unit.
Re: Rear Heater Leak
Posted: Thu Sep 20, 2018 3:37 pm
by mikeonb4c
I've a vague recollection that a generic metal replacement one can be got?
Re: Rear Heater Leak
Posted: Thu Sep 20, 2018 4:02 pm
by TheLongRoad
mikeonb4c wrote: Thu Sep 20, 2018 3:37 pm
I've a vague recollection that a generic metal replacement one can be got?
There is, but the drivers side was really difficult to fit, looking at the pipe that runs over the gearbox I don't think it can be done without a lot of dismantling.
Re: Rear Heater Leak
Posted: Thu Sep 20, 2018 4:14 pm
by Roy748
Hello Frank
What I mean by pipe joiner is sold at wickes as
Wickes Solder Ring Straight Coupling - 15mm Pack of 5
Product Code: 424886
I used these to give the extra thickness the 15mm pipe required in order to form a seal with the original rubber pipes feeding the heater matrix.
Re: Rear Heater Leak
Posted: Thu Sep 20, 2018 9:26 pm
by Diplomat
thank you, Roy.
I will check that out with Wickes.
Meanwhile, I had a quick look underneath and no immediate sign of trouble but it is as well to gather some bits and pieces and also visualise the job in anticipation.
Frank
