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Old 04-17-2019, 05:51 AM   #4
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Join Date: Mar 2017
Location: Arizona
Posts: 63
Originally Posted by tonythetiger View Post
2002 tip, 986 S with 80K

Flashing 4th and D after warm up, however transmission works fine and the normal lights come back in a minute or so, go to 4th and D again, etc as I drive. Automatic and manual function fine, just dont get the feedback in the dash lights when its out.

I have heard this could be the transmissionís coolant vacuum valve. Does this circulate coolant through the transmission? That seems to be the simple fix and makes sense.

I had the transmission serviced, new fluid, filter etc about 6 months ago, but the problem didn't completely resolve. Now with the warmer weather, I'm thinking I should iron out this issue.
I have a durametric scanner, but it only shows alarm fault codes (historic, none present now) to be honest, I am not sure I'm using the durametric to its potential, it seems pretty lame when I do the short test on all modules, so I would welcome advice on this as well.

would a faulty coolant vacuum valve potentially lead to heat issues with the tiptronic, manifesting in the 4th and D flashing?

That controls the coolant that goes to the trans cooler mounted on the transmission.
Mine broke in half and car had to be towed it's only time. It's also a lot of fun to replace, it's the same type of valve that controls coolant to the heater. Valve is not very expensive.
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