Touareg :: Insufficient Coolant Warning Light?


Nov 23, 2003

Just over 2000 miles on trex and i just got an "insufficient coolant" warning light this evening. the car had been idle for 2 days or so (i.e. cold start) and the warning light came on. I was running a short errand -- and when i re-started the car to come home, the warning did not come up. A couple of questions...

1) I checked the floor of my garage; I'm not leaking fluid. how could this have happened?
2) If the light didn't come on during the return trip, is everything ok?
3) Checking the manual, it says that i must use a specific type of coolant if I'm going to top it off myself --

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I bought the vehicle knowing that it was not running well. It idled quite smoothly but had no power on acceleration but was able drive it home at ~30mph. Never had a timing belt change so I foolishly fixed that before I solved the low power problem. Timing belt change went OK and then I discovered the exhaust manifold was cracked - HUGE crack. Fixed that and installed new cat at the same time. Checked compression and read consistent 127-129 across 4 cylinders. Also installed new before and after O2 sensors at this time. Started her up and sounds good, idles smooth. Hooked the scanner up and read P0115 (something about engine coolant temperature circuit), so I cleared it thinking it must have overheated in the past and that is how the E-manifold cracked.

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I have no codes showing now however it appears to be running in open loop and scanner shows "open loop due to insufficient engine temperature" but engine temperature is reading 200 deg F. Also the O2 sensors are not being read, see attached readout.

At this point I am stumped and am thinking I need to check fuel pressure or maybe injectors are clogged. But why would it be running in open loop?

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I just checked the coolant last week after an oil change and noticed it was at the bottom minimum line, it's fairly below that now. Does this call for a ride to the dealership? I've seen where people have had pumps/hoses replaced already due to leaks. Nothing on the ground from what I can tell and nothing seems to be leaking under the hood.

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So my third time is in the next week or two... fab. They say the whole harness is to be replaced, which is cool. I respect my service team, the engineers as well... I'm going with the flo, I'm pretty laid back.

My questions is...How long do I need to go with the flow if this keeps happening? All the while this is going on, for every issue I have that's super legit airbag, stepper, running gear. They keep giving me the hook up on, new wood trim, new headlight switch, new mirror switch, new buttons on my center console, new buttons on the nav....

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Drove to the dealer car feel fine but the screen does not show the gear you are on while driving, blank.
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I just pick up my wife car on Wednesday after two weeks Passat 06, Cam and HPF replacement.

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