C70: Pink fluid dripping under car at high rpm ?

[Aubergine S70]

Hello, I’m not 100% sure of whereabouts the torque converter is but upon reading your car is a 5 speed automatic and I’ve recently took one on a banger charity rally, and mine also had a few leaks underneath. But sometimes the 5 speed can suffer from the same problem as the 4 speed. When this happened to me I did some research and the power steering resovoir is prone to cracking, or a brass fitting inside the resovoir comes loose and leaks. From all the replies it seems that it could be anything and I’d give everything a good check including the gearbox fluid level like you mentioned.
Good luck as it could be anything

[doingitsideways]

Does look too thin to be ATF. Also, the torque converter is at the other end of the block.

If you've only just changed the coolant, did you drain the whole system?
If you drained, then refilled with water and topped up with antifreeze, it may not have mixed in yet and your coolant in the block is still red and seeping out through the waterpump as suggested.

Or, it could be seeping and dissolving the red crusty stuff, making it appear red.
The crusty bits are after all concentrated antifreeze

[SteveSarre]

I'd vote for the "dissolving the red crusty stuff"
Can you see any?
Unfortunately that also indicates a leak somewhere which you should keep an eye on at least.
I don't have any particular explanation about why it only happens at high rpm.

Does your oil filter housing have some deep gouges? I would consider replacing that - not expensive.

Steve

[doingitsideways]

Failing water pump bearing seal could explain the high revs thing

[krussel]

Originally Posted by ITSv40

I still think it is water pump leaking. If you look down the back of the engine - between the cam belt cover and bulkhead - you will most probably see some white or brown staining down the cam belt cover/ block.

Have you taken the top cam belt cover off to get a better look? The top covers come off relatively easily and although will not expose as far down as the water pump should give you a better view.

Thanks.

Yes got the top cover off to see if any steam would come out but nothing. Put a USB endoscope down there but its hard to see the bottom of the pump. Nothing leaking at the top.

My gut says pump gasket giving way at high pressure on fast rpm and then sealing as the rpm drops.

[krussel]

Originally Posted by doingitsideways

Does look too thin to be ATF. Also, the torque converter is at the other end of the block.

If you've only just changed the coolant, did you drain the whole system?
If you drained, then refilled with water and topped up with antifreeze, it may not have mixed in yet and your coolant in the block is still red and seeping out through the waterpump as suggested.

Or, it could be seeping and dissolving the red crusty stuff, making it appear red.
The crusty bits are after all concentrated antifreeze

Yes iam thinking the same. I did 6 flushes till clear water but there is a lot of pink powder all around the crank so iam thinking its been leaking for some while. The powder would certainly change the colour of the new green coolant. When it first let go the water bottle lost half is volume which is why i thought it was the rad top hose and i replaced that.

My gut says water pump gasket failing under high rpm and pressure.

[Rhoy002]

Several possibilities exist. One more for you. A failing transmission will boil the transmission fluid and this will over flow out the ATF dipstick and run down to its lowest point. You may not notice any problems with the transmission until it fails more, or the fluid is low enough to not work properly, because the fluid has boiled and over flowed out the dipstick the areas around the transmission themselves will look dry.

[krussel]

Originally Posted by Rhoy002

Several possibilities exist. One more for you. A failing transmission will boil the transmission fluid and this will over flow out the ATF dipstick and run down to its lowest point. You may not notice any problems with the transmission until it fails more, or the fluid is low enough to not work properly, because the fluid has boiled and over flowed out the dipstick the areas around the transmission themselves will look dry.

Yes its the ATF iam most worried about. I am 99% sure its coolant from the water pump leaking and evaporating leaving a pink powder. Under high rpm its dripping.
I will be putting it into a garage in April so will report back here the findings and costs.

[krussel]

Just wanted to update this.

Turns out it was the coolant coming from the water pump area. Bit of an odd one. The garage had the car for a few days but could not get it to leak at all. They left it over night under pressure and no leak or loss of pressure.

In the end i gave the go ahead for a full cambelt kit and new pump. All gen Volvo parts this time including the coolant. Last time red coolant was used.

The old pump was not found to be leaking (non Volvo) and in pretty fair shape HOWEVER the pump had been fitted with loads of silicone and no gasket ! It was concluded that the silicone seal was giving way under high RPM and pressure and then re-sealing itself when the pressure dropped.

So all fixed now. Cost of £464 which included 2 full pressure tests.

Next i will treat the old girl to a couple of new Goodyear front tyres. :-)