Gearbox cooler leaking

[porschedavid]

I have a 996 c4s and got coolant leak from gearbox cooler,As anyone changed one of these,How hard to change.i also think it is an oil cooler for gearbox as well

[JFP in PA]

Originally Posted by porschedavid

I have a 996 c4s and got coolant leak from gearbox cooler,As anyone changed one of these,How hard to change.i also think it is an oil cooler for gearbox as well

I'll assume you are referring to the Tiptronic cooler as the manuals did not have a trans cooler. First think you need to determine is if it is the cooler itself, or the lines, or the control valve that is actually leaking. None of these are particularly hard to swap out, but you need to be comfortable working in very tight spaces as there is not much room around any of them.

Once the repairs are done, you will need to top off the cooling system and get the air pockets out.

[yelcab1]

A lift helps a great deal !!!

[porschedavid]

the coolant is leaking from gearbox atf cooler,as any one changed this and is it easy .and any advice for bleeding the cooling system

[yelcab1]

I have not done this swap because I don't think it happens that often. But I remember looking at it while I was under the car and it looks straight forward enough. Be sure to get all the gaskets and orings you need.

As for bleeding cooling system, get an Air Lift. You are done in 5 minutes. No bleeding.

[porschedavid]

the top two bolts look hard to get too,whats an air lift

[JFP in PA]

[yelcab1]

That 997 is hard to bleed normally so AIRLIFT is the ticket.

[porschedavid]

Hi
I read somewhere that when some used airlift tool they empted the coolant did vacuum then refilled and had to do vacuum again is this right

[JFP in PA]

Originally Posted by porschedavid

Hi
I read somewhere that when some used airlift tool they empted the coolant did vacuum then refilled and had to do vacuum again is this right

No. The Airlift system is not designed to extract coolant, only air. You do a gravity drain, then evacuate the system before pulling the premixed coolant and distilled water (50/50 mix) into the system. One shot refill in about 5 min., no follow up bleeding required. This is why shops used this system, no come backs.

[yelcab1]

You empty your cooling system. All of it.
You use the Airlift to create vacuum in the system.
Then you let the vacuum suck in the new coolant to fill it up into all the air pockets.
No bleeding is required cause no pockets exist.