Coolant possibly leaking into the oil pan?

[PandaS5]

Hello! I have done an extensive search and came up with a few theories to my issue. I am asking in to confirm my theories.

Issue: I started losing coolant (light came on and coolant was towards the bottom of the tank) and I went on for about a week. Yesterday I got the same light and low tank, filled it up in the afternoon and coolant light and tank was empty again by the evening.

For the past week I have been observing for leaks, none to be found. Last night I drained some engine oil out so the it's a little below the min/max on the MMI oil Guage. I drove around for a few miles, some miles aggressively to see it how it responds. When I got back and tested it again the oil is not at Max. I tested this twice.

-The car is not lacking any power/ performance.
-The oil on the oil cap is not milky.
-The Engine oil I pulled out is black but didn't seem watery or milky?
-I do feel I hear a hissing sound somewhere around the coolant lines but no leak or lack of pressure it seems.
- I put some of the engine oil in a plastic cup and it did have some time bubbles when I was pouring it in( could this be coolant?)


I just purchased a pcv valve, water pump and thermostat to open it up and replace what is necessary but before I begin I wanted to ask; could these parts be possibly the main culprits to coolant loss with no leak and oil filling back up to max?

Sorry for the long post.

Thank you

[PandaS5]

Apologies for a few typos.

- engine oil was a little below the middle of the min/max and after the test drive, it filled up to Max

[Gwillplays]

You indeed have a leak if your reservoir tank continues to run low. After a drive, do you smell coolant at the front end of the car? If you do, you are heading in the right direction of replacing the water pump. You could also perform a coolant system pressure test. This will identify leaks within your system. If the system can not hold pressure, continue to pump tester and look at all exterior hoses and water pump for leaks or hose breakage.

Two possibilities could be why you are not seeing the coolant leak. First, the coolant could be evaporating off the hot engine as it leaks from the water pump. Second, the coolant maybe collecting under the intake or supercharger and evaporating in that hot environment. If it under the supercharger, I recommend replacing the thermostat, PVC valve and coolant connector hose, as these items will all be accessible.


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[PandaS5]

You indeed have a leak if your reservoir tank continues to run low. After a drive, do you smell coolant at the front end of the car? If you do, you are heading in the right direction of replacing the water pump. You could also perform a coolant system pressure test. This will identify leaks within your system. If the system can not hold pressure, continue to pump tester and look at all exterior hoses and water pump for leaks or hose breakage.

Two possibilities could be why you are not seeing the coolant leak. First, the coolant could be evaporating off the hot engine as it leaks from the water pump. Second, the coolant maybe collecting under the intake or supercharger and evaporating in that hot environment. If it under the supercharger, I recommend replacing the thermostat, PVC valve and coolant connector hose, as these items will all be accessible.


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Thank you for the response!

I am not smelling any coolant after the drive but i'm hoping its just the thermostat and/or PVC valve as at this point as I already bought these parts to do the repair. I do not want to replace these and still have the same issues.. (which would ultimately suck.. lol)