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Volkswagen Passat, Sedan, Wagon
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#3004 of 3341 Oil Temperature gauge issue
Feb 12, 2010 (7:07 pm)
I have a 2003 VW Passat with 66k miles on it. The last few days I noticed that the oil temperature gauge fluctuates a bit between 170 and 190. Earlier it always used to stay constant at 190 after the engine has been running for some time. Last few days I see that it goes to 190 and then keeps changes between 170 and 190.
Is this something of concern and needs to be fixed immediately.Any helpful comments will be greatly appreciated.
#3005 of 3341 Re: Oil Temperature gauge issue [blitzg99]
Feb 13, 2010 (12:22 pm)
First, that's not the oil temperature gauge - it's the coolant temperature.
Now, let's get a little more information to help you. What is the car doing when the gauge drops? Are you coasting down a hill? Are you at highway speeds and see it gradually drop?
As I see it, you have two possibilities - 1) the temperature sensor for the gauge is bad (it happens on Passats). 2) the thermostat is bad.
I have an '03. I started to notice that the temperature of the air from the heater was not the "melt your sneaker" hot anymore. Further, I noticed that this was occurring at highway speeds, but even worse if I coasted down a hill at highway speeds. Turned out my thermostat was sticking open ever so slightly.
GIve more details of when and how this is occurring and I'll bet we can narrow it down for you.
#3006 of 3341 Re: Coolant Temperature gauge issue [altair4]
Feb 13, 2010 (1:45 pm)
Thanks . You're right. It is the coolant temperature gauge that fluctuates.Once the engine warms up it reaches 190 then goes down a bit to 170 and then stays between 170,180 - 190. It happens on both highway or local roads. We are in the Twin Cities and do not have much hilly roads up here. Earlier it always used to stay at 190 constant after running for a few minutes.
I have not seen much of a difference in the temp. of the heated air but will pay more attention now that you mentioned. Does this require immediate attention.
Thanks in advance for your help. Appreciate it.
#3007 of 3341 my gauge dances too
Feb 14, 2010 (4:49 pm)
Mine does the same thing.
It stays 190 but when coasting down hill it drops one notch. When I start using power again it climbs back.
I got MIL (check engine light) and per Auto Zone it is cooling system efficiency problem.
Do you think broken thermostat could do this?
#3008 of 3341 Re: my gauge dances too [krzyss]
Feb 14, 2010 (7:47 pm)
I am not sure what the problem is. Could be the thermostat. I talked to the service guys at the local VW dealer who said it will not need immediate attention. What are you doing about this? Pls. let me know,
#3009 of 3341 Re: Burning Oil Smell through HVAC vents [bjss]
Feb 15, 2010 (9:45 am)
bjss: I had same issue on my Jetta 2.0, but the problem turned out to be a leaky oil sender unit. Not sure it that would be the same with the 1.8, but take a look. I think the dealer may have done the wrong repair...a 1.8 with 75k should be not leaking through the valve cover, but I suppose it's possible. Good luck...vwdawg
#3010 of 3341 Re: 1999 Passat - Water in Front Footwells [edu6]
Feb 15, 2010 (10:03 am)
This seems to be an old forum item, but I see Ed responded recently. My understanding re: water leaking into the floor area is that it's usually a plugged drain for the sunroof. Water will soak the into the floor carpeting and ruin the computer module which is mounted under the carpet. Ed, is this the same drain you are talking about? I'm not sure how the ABS was ruined, but I quess anything's possible with a VW. vw dawg
#3011 of 3341 Re: Burning Oil Smell through HVAC vents [vwdawg]
Feb 15, 2010 (5:26 pm)
Thanks vwdawg - ended up taking it to an Independent VW shop for some additional work (rear brakes/rotors) and asked him to look at the Valve Cover Gasket. He showed me and it was clear the work was not done (cover was dirty with oil and fairly obvious it had not been removed). Work was done last Dec and I have only driven it 700 miles since then. If it was done, it clearly would be in much 'cleaner' shape.
Took back to Dealer today to have them check the burning oil smell and possible leak...will not spring the independent shop on them until after I hear the verdict.
BTW - while the car was on the lift (at independent shop), I noticed some Hydralic fluid leaking from the motor mounts - not excessive, but something to be handled within the next year.
#3012 of 3341 Re: Burning Oil Smell through HVAC vents [vwdawg]
Feb 16, 2010 (11:16 am)
Update - Dealer called, said it was a faulty Valve Cover Gasket...replacing with new today...avoided a potentially nasty situation
#3013 of 3341 Re: my gauge dances too [krzyss]
Feb 16, 2010 (6:35 pm)
All I can tell you is that was the behavior of my car and the thermostat was found to be sticking open ever so slightly. Once it was replaced, I the Temp gauge behaved as it always did and the heat output of the HVAC returned to thermonuclear levels.
Initially, I noticed the car's interior wasn't getting as warm as it used to on the same settings, same external ambient temperature range. Then I started noticing the gauge would slip a notch or so on long coasts downhill (we got lots of hills here in SW PA).
The day I took it into get repaired, the ambient temp was -1 degree F. It was the first really cold day of the winter last year. I was very glad I had heated seats that day. The cabin just wouldn't warm up very much.
Driving home from the dealer, the temp was 10 degrees F. I took my parka off after a couple of miles of driving.