barncobob

ditto, supposedly they use some high tech vacuum to get all air yet i had to add more 1x

DHL

Porsche has an automated procedure to bleed the air due to the complexity of the coolant system. They have to open the correct valves in the right order to get all the trapped air out. But some bubbles remain trapped and won't be removed until coolant has had a chance to flow at high RPM and under vibration of the engine running. Ergo the coolant level will drop as this air is finally purged.

dj997

So, I picked my car up and like barncobb now I am also getting a low coolant level error. They want the car back, but it seems like I should just be able to put coolant in it. Does anyone know what to use?

BSO

I bought the Porsche coolant to use when I added the third rad option. That's what I would use.

If it's not too far, go to the dealer, the gallon costs between $30-$40. You can also use distilled water if the volume required is small.

LexVan

Add some distilled water, unless you have access to deionized water. Add slowly till the bobber start to move into center position.

dj997

Thank you both!

caritch

Hi. What year 991.2 do you have and do you know the part number for the water pump that was just installed? I am on my second water pump at 16k miles.

cclcal

interesting...glad you find the culprit.
Mine overheated too but it was due to numerous leaves/pebbles blocking airflow to the radiators. This was before I put in the screens in the bumper openings.

DHL

If its leaking coolant, then you should add coolant, not water (because you will dilute the remaining coolant glycol concentration).

If the coolant level has dropped dramatically, then it is unlikely the loss is water only.

barncobob

i got a galloln of Zerex G40?, the pink stuff,,they are the OEM coolant manufacturer for Porsche,,$24,readily available...

dj997

it is a 2018 and just turned over 17000k miles. They told me they just didnt put enough coolant in...idk, we will see.

barncobob

mine has been perfect for over a month after adding that 2 cups the day after repair, just gotta work those little air bubbles out by driving it..

LexVan

DJ997's car is not leaking coolant. These cars have over 27,000 mls of coolant in them. Adding 8-16 ounces of distilled water, to get the red bobber to move to the center position, is a ripple in an ocean of fluid. And your last sentence is nonsensical; the cooling system is made up of coolant plus water, it's impossible to leak one without the other.

fuddman

1) "These cars have over 27,000 mls of coolant in them." Don't mean to sound argumentative, but; I'd be interested in knowing where you got this number from?

2) "...get the red bobber to move to the center position..." Not sure who suggested this, but; per the manual (pg 99 - 2017), fill until the red bobber is in the slot next to the embossed word "max."

3) Insofar as refilling the coolant tank, the water/coolant composition of the fluid you add needs to be 50/50. Per the manual - use pure water only in an emergency. If you use water only, then the mix ratio in the tank needs to be corrected. (Good luck with that)

The coolant cap is a bear to take off and put back on. I'm beginning to suspect a loose fitting coolant cap may be the culprit when the loss of coolant fluid is measured in 16 ounces or less over, say, 3000 miles or so. If you want to measure coolant fluid loss, it's better, I think, to measure loss over miles traveled rather than just over a time period.

LexVan

1) These cars have over 7 gallons of coolant in them. Simple match, converted to metric.

2) Again, 200-400 mls of distilled water is not going to change the freeze point and mix ratio.

3) Our caps are super easy to remove, and re-thread. Especially when compared to my prior 986/996 and 987/997 cars.....those were a bitch by comparison.