Overheat query

Technical questions and answers about the Mazda Bongo

Moderators: Doone, westonwarrior

DaveH76
Apprentice Bongonaut
Posts: 9
Joined: Mon Jun 15, 2020 12:23 pm

Re: Overheat query

Post by DaveH76 » Sun Oct 18, 2020 12:23 pm

Thanks guys. So in a nutshell Geoff - pinhole leaks are a pain in the arse to find....!! Brilliant :shock: :wink:

Haydn - thanks for the tip. I have looked at the egr pipe flange where it meets the air intake and it doesn’t seem too bad, and the flange where the air intake pipe bolts onto the plenum chamber seems ok too as does where the manifold bolts to the head (no oil being purged out between the mating surfaces). I haven’t checked the egr valve itself though so thanks for that, I will certainly give it a look over.
Bob
Supreme Being
Posts: 14382
Joined: Wed Oct 17, 2007 12:54 pm
Location: North Somerset

Re: Overheat query

Post by Bob » Sun Oct 18, 2020 1:01 pm

Check out the UV kits Geoff recommended. :wink:

https://www.ebay.co.uk/itm/UV-Dye-Torch ... SwJ7RYWWhQ
DaveH76
Apprentice Bongonaut
Posts: 9
Joined: Mon Jun 15, 2020 12:23 pm

Re: Overheat query

Post by DaveH76 » Sun Oct 18, 2020 2:50 pm

Will do, thanks Bob. Just spent an hour on it giving it a good look over. I can’t see any obvious signs of a leak but it definitely has air in the system.

I reckon the next step is going to be to drain the system, remove and backflush the radiator and the engine (the coolant is really brown rusty colour), refit the radiator, and fill, bleed, and add the UV dye.

Thanks guys, much appreciated =D>
User avatar
haydn callow
Supreme Being
Posts: 5710
Joined: Mon Jan 08, 2007 9:50 pm
Location: Somerset

Re: Overheat query

Post by haydn callow » Tue Oct 20, 2020 4:51 pm

When you flush push some water ‘up’ the system vis one of the rear heater rad pipes.
http://www.coolantalarm.co.uk
Developer of the Mazda Bongo Coolant loss Alarm
Also BMW Clocks