Coolant drop 0,1l per 2000km

[NF7]

My coolant started dropping. About 0,1l every 2000 kilometres. Car does not smoke, no sludge under the cap. There does not seem to be any leak.

Any ideas? Or should I just forget about it.

 

[Verminator]

Could be down to a pin hole in a pipe and only leaking when under pressure and evaporates on the hot engine so no coolant is seen

 

[gravelsandwich]

I have the same problem, no sludge under the cap and no smoke but I have noticed a lot of residue around the head or cam cover which suggests it's leaking from one of these gaskets.

 

[NF7]

I have the same problem, no sludge under the cap and no smoke but I have noticed a lot of residue around the head or cam cover which suggests it's leaking from one of these gaskets.

Did you fix it or are you planning to?

 

[Pedro]

Change the filler cap on the expansion tank mine lost a small amount of coolant after a few weeks & anti freeze stains underneath the bottle confirmed my suspicions bought a new cap end of problem

 

[gravelsandwich]

Did you fix it or are you planning to?

My RCZ is booked in next week for a diagnostic, I'll post the results.

 

[NF7]

Thanks, keep me posted . I plan to take it to a garage in about a month and a half.

 

[gravelsandwich]

I've got the diagnosis back from my service agent and and the cause of the leaking coolant is the coolant outlet tank. I think it's also called the thermostat coolant housing. Of course it's plastic and has cracked. You can buy them for around $150 -$250. The job to replace it looks fairly involved, It's buried deep in the engine bay but not impossible and you'll save at least $1000. I'm getting charged $1500 for the diagnosis and replacement which is pretty steep but unfortunately as my RCZ is in pieces at the dealer so I've got no choice. Here's a YouTube video on how to replace the tank.

 

[NF7]

I've got the diagnosis back from my service agent and and the cause of the leaking coolant is the coolant outlet tank. I think it's also called the thermostat coolant housing. Of course it's plastic and has cracked. You can buy them for around $150 -$250. The job to replace it looks fairly involved, It's buried deep in the engine bay but not impossible and you'll save at least $1000. I'm getting charged $1500 for the diagnosis and replacement which is pretty steep but unfortunately as my RCZ is in pieces at the dealer so I've got no choice. Here's a YouTube video on how to replace the tank.

Thanks for the reply. I'll check with my mechanic next time I'm there.

EDIT: Forgot to say - that I've been monitoring the loss every 1000km. It seemed to stop on its own, as I've now driven over 3500km and didn't lose any coolant.

 

[Ahmed]

Problem similar to yours, started at 100ml progressed t0 400ml for 2 hours driving. Mechanic diagnosed water pump, but would only do the whole water pump, thermo housing and all pipes for 1100 pounds (150 parts + 950 labour). Did water pump myself, unfortunately stripped one thread, Still leaking, but only about 200 ml every 4 hours driving. Changing the water pump, hard, engine has to be tilted, very cramped , speacial tools. Changing thermo housing challenging. The pipe in between water pump and thermo housing, good luck. Which is what I will be doing in about 6 months. Now I know why he wanted 950 labour.