Member Since: 18 Apr 2022
Location: Oxford
Posts: 43
EGR Cooler Bypass / Coolant Leak
Hi all - wondered if you could sanity check my temporary (and therefore probably semi-permanent) solution for a coolant leak I've found. I've been topping the coolant up every few days for a couple of weeks and finally got round to hooking up a pressure tester, to discover that I've got a fairly significant leak (under pressure) from the hose into the left EGR cooler.
Pulled out the battery and the tray to have a closer look, but with the AC pipes and EGR valve still in place I can't see how I'm going to get to this hose easily.
Fortunately my EGRs are blanked, so having looked at a diagram of the coolant system I'm thinking of simply blanking off the coolant pipes at the positions marked with arrows in the diagram below:
Measurements are outer diameters of the pipes in question for when I go looking for blanks. The logic of doing it in these positions is that I have a plastic t piece at the front of the engine coming from the water outlet, and the metal pipe looping over the top of the engine at the back, both of which could have a silicone blank with a hose clip attached fairly easily (something like this https://www.ebay.co.uk/itm/223738020113).
Rear pipe:
Front pipe:
This would also preserve the operation of the thermostat(?) on the water outlet t piece.
Any reasons why this shouldn't work, given that both EGRs are blanked? It's a 2005 car no wax thermostats on the EGR coolers that I'm aware of, looks like a straight-through connection.
Many thanks for your thoughts!D3 2005 HSE
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22nd Feb 2023 10:23 am
riverblanche
Member Since: 31 Aug 2010
Location: retford'ish
Posts: 2214
Hi,
dont know the answer of do or dont do it,
but
if I was considering doing a temp repair I would go for connecting the 2 pipes together rather than blanking each one, that way the coolant flow is still maintained.
Member Since: 18 Apr 2022
Location: Oxford
Posts: 43
Joining the two pipes together is certainly the plan in the long run, as far as I'm concerned that would be a perfectly valid way to bypass the coolers, but it looks like a ramp job (or at least a lot easier on a ramp) which won't be possible for a few weeks at least, so will blank them in the meantime. Also crossed my mind that that fewer pipers involved in the coolant circuit the fewer opportunities for coolant loss!
I've ordered the relevant caps to get the blank off job done so will report back on whether I experience any spontaneous combustions, explosions etc...D3 2005 HSE
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repair I would go for connecting the 2 pipes together rather than blanking each one, that way the coolant flow is still maintained.
