Newbie Question - I've Got A Coolant Leak :-(

[Shineyis200]

Hi,

I'm new to this forum, I've had my is200 for over a year now, but all of a sudden I'm loosing coolant, I've been looking though loads of threads on here for help.

I've got red residue on the top of the water pump next to the bypass pipe, would most people recommend replacing water pump and the o rings on the bypass pipe or just the o rings??

Please be gentle I'm new :-)

[Mr.Rudus]

hi -

a picture could help. i would say change the bypass pipe & O rings. then see if any leaks. its the easier step & sounding more like it as its coolant build up on top of the pump -

good luck.

[chris-g-]

just bought 2005 is200,42,000miles it appears to be using coolant,i bought the correct red recommended coolant,have now topped up a few time using around 1.25 litres,the coolant in the radiator is not red though its discoloured ,brownish in colour,i fear i may have bought a pup and my head gasket is on the way out,any ideas please?? or is it just a case of going and getting it tested

[clifton 94]

hi I would flush the system and change the bypass o rings and fill with the correct coolant. sounds like it has had a leak for some time and been topped up with water only and inside the water jackets is starting to corrode

[steve2006]

O rings are around £5.00 each from Lexus.

Part number 90301-17009

Diagram available on PM request.