Golf IV / Jetta IV :: Coolant Temp Light Came Flashing On - Oil Getting Into Coolant
Sep 14, 2016
Okay so recently I was driving my 2000 Jetta and the coolant temp light came flashing on, when I went to check the coolant I was surprised to discover that it was like a mud brown color, almost looks like peanut butter. From everything I have read this can be from a few things, either rust build up that is gunking everything up and oil getting into the coolant somehow. I'm pretty sure its rust build up but I was wondering what everyone thinks about this, I was also not using G12 coolant which I'm told now is the premier brand for VW's.
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Today was the first time my wagon has stranded me due to a mechanical issue. During city driving my coolant temp light came on so I pulled over to check it out. The fans appeared to be working, the coolant was a fair bit above the normal mark, but I'm not sure the water pump was running. I couldn't feel anything when I squeezed the top radiator hose. This is an '03 with about 50k miles on it.
I'll be taking it in Monday morning so I was curious what people's thoughts were. If it's the water pump is there anything else I should consider getting replaced while I'm at it? I'm still on the original timing belt, a change I've been delaying a long time since I drive so little so it might be time to bite the bullet and do it.
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I have a 2004 VW Jetta 1.8T , what the normal coolant temperature should be?
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So my check engine light came on in my 04 jetta sw, and when I had the car read, it gave me a code that tracked down to be a bad coolant temp sensor. I bought the replacement part from my local VW dealership, installed it and the check engine light went away. Now about 2 weeks late it came back on, and I am getting a reading of "Coolant temp sensor high voltage". So it goes from needing replaced, then the replacement is running high voltage?
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I just replaced my CTS, and I noticed that there is a small section of exposed harness wiring between the end of the loom and the CTS connector. I can't tell if it came loose when I swapped the sensor, or if it was this way for awhile, but all of the other harness connections around this area are completely covered and the loom end doesn't seem to clip into the connector or anything. If I were to try and seal it, I would need to use tape.
How hot does this area get? It seems like there shouldn't be exposed wiring here.
Picture taken with the new sensor: [URL] ...
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My CEL is on for P0116 Engine Coolant temp circuit, range or performance problem. I replaced the CTS, thermostat, and did a complete coolant flush/replacement last November. Car worked well over the winter no issues. Last week when the CEL came on it gave me P0301 and P0440 as well. I did a reset and the lights stayed off for the week. Then P0116 came back. Is it possible that the CTS is bad again? I measured the resistance on the CTS and hot it is about 300 ohms and cold is 2.45k ohms.
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My temperature has been randomly dropping, them back to middle, and recently my engine was overheating because I'm guessing the fans didn't turn on, because I'm also guessing, the engine didn't know it was overheating?
Anywho, during my replacement, I made sure to get rid of the pressure, and the car was cold. I tightened the cap again, but when I took the sensor out, all the coolant spewed out.
Now if I understand this correctly, do I have a leak? I figured the leak I had was coming from the temp sensor as it is.
Here's some pictures for those who'd like to see ....
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I recently got the solid check engine light for my 2003 VW Jetta 1.8T GLS. I used a bluetooth OBDII dongle and Torque Pro to pull the code P0118. This seems to coincide with my symptoms:
Car idle at start in park stays around 1100RPM then in reverse it drops to 1000RPM then back into park and it stays around 900RPM and keeps that at idle.
If I start the car then immediately reverse out of my driveway then the car has a very rough idle but if I wait around 5 seconds in park idle then reverse out of my driveway it is smooth.
My car dash thermometer stays pretty close to the bottom low then after about 4-5 minutes it shoots up to 190F and stays. Gas mileage is also very poor.
I looked up a tutorial which shows the parts needed and how to replace the sensor : [URL] .....
I removed the engine cover and believe I found the coolant temp sensor in the spot the tutorial shows. My question is if there is anything I should be aware of before attempting to replace this sensor that this tutorial doesn't cover? I took a screenshot of what I believe is the coolant temp sensor.
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The past two days when I went to warm up my car, when I got back in it to leave I noticed the engine coolant light flashing. I checked the book and it just says if its flashing to contact the dealer. I have already done so for my next maintenance anyway. It has been around 10 degrees out both times when i started it. 2012 GTI with 9300 miles. Also, if you turn the car off, and start it back up, it does not come back on..
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I was driving home from work on Tuesday and I saw a message flash across the MFD saying that I needed to check coolant and consult owner's manual. Also the coolant light was constantly flashing. I was quarter mile from my house so I just drove home, checking the temp to make sure it was ok. I got home and opened the hood to see no coolant in the reservoir, but there was some in the hose. I was like "ok cool I just bought this car 3 months ago but not a big deal." I also looked on the ground under my car quickly and there wasn't a leak. I happen to live about 500' from a VW dealership so called them up and they said bring it over.
When I got there the SA came out and took a look and said to give him 5 to fill it up and I'd be on my way. As I'm waiting in the lounge, I notice a puddle on the ground under my car. I told him about it and he confirmed coolant leak. But because I didn't buy the car from them, they wouldn't give me a loaner, so I had them fill it up and I took a ride to where I bought the car (30 mins away). Now I'm driving a new Jetta. I got the call from Balise yesterday (the dealership I bought it from) and they said my radiator core was defective internally, they overnighted a part and they started fixing it yesterday morning. Since it's such an involved job, only a master tech can do it and there might not be one there today (which I have to check on around noon) so I might not get it back until Tuesday. But I really can't complain (other than the fact that it's a brand new car), I have a car to drive and it's being fixed properly.
It probably was that damn lowerthanzimmy sticker. I realize defective parts are made, they can't catch all of them before they're installed.
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After about an hour of driving, the coolant temperature light on my 2010 GTI started blinking. The gauge never showed a temperature higher than the usual 190, including traffic and idling. Having reached my destination, I shut the car off and then back on, happy to see no warning lights at all. One dinner and some three hours later, I started back for home. 20 minutes into the drive, the car sounded three tones and the blinking light came on again.
Like before, the car drove without incident for the rest of the drive, and the light was no longer present once the car had been shut off and then on again. The owner's manual said that the coolant level might be too low, or the temperature too high, but neither of these seem to be the case. The car is equipped with GIAC stage I software and an Audi S3 intercooler.
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My 99 2.0 jetta tends to flash the temperature light on cold starts and when the cars running for a while and im not moving (traffic) the light flashes and starts to overheat. Whats the problem? The previous owner had changed the radiator begire i bought it but can it. I need a new radiator fan or is it my thermostat?
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I know this is a common problem, it sounded like the coolant resevoir was the place to start so I replaced it today and I still have the low coolant light blinking, I don't know what else to do.
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I got an 02 gti automatic. My low coolant light has been coming on often lately. I checked my coolant level and it was real low. I added coolant and the light didn't come back on. After a few weeks the light came back on. Again I had to add a lot of coolant..I have no leaks though. Where could all this coolant I add be going? I am not over heating or anything. Its like my car is literally drinking this and peeing it out, I have to add some almost every week now for the light to stay off.
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Mk4 Jetta Gli 1.8t , car was over heating only when sitting 5+ minutes at idle, mechanic said the big fan needed replaced so he replaced it. Car still over heated so i replaced the coolant with G13. It hasn't over heated yet but got in the car this morning and the coolant light started flashing and car was telling me to STOP the car. Checked out the coolant and it was on the low side. What it may be? Leak somewhere? Bad thermostat or water pump gone bad? Timing belt and water pump were done when i bought the car when it had less than 50k miles, car now has 99k miles on it.
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Car: 2003 Jetta VR6 GLX 24V
Sometimes when I start up my car ( I want to say when cold, but I haven't tried after its warm yet), the coolant light and warning come up. I obviously checked the coolant, and it is a little low. But it's been where it is since I bought the car, and I haven't noticed any leaks. After I turn the car off then on again the light goes away.
The car is running perfectly fine, it's not running hot or cold. Another thing I have noticed is that my fans don't seem to be working. ( I know it's a common problem). But I'm thinking this could be the fact that it's below 0 today.
I haven't gotten it scanned yet, but what's going on; i.e., Thermostat, sensors, fans etc..
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I've got some problems going on with my 2001 VR6 Jetta. I was driving home from my way to work this evening and all of a sudden the indicator light came on and told me to stop and check the coolant level. Within about three minutes the car was already up to about 200. I pulled over to a gas station and the coolant reservoir was completely empty. So I began to pour coolant in the reservoir and fill it up I notice I was pouring a lot of coolant so I went to the hood looked on the driver side below the bumper and water/cool was pouring out everywhere. I inspected as many radiator hoses as I could and did not find any cracks. The water seem to be pouring out from around the thermostat housing. My question would be since I don't know whole lot about cars would they crack thermostat housing because you need to have this problem?
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Before I go buy a Bentley manual to dig around, when should my radiator fans kick on. I had the car idling for 10 minutes, no ac or heat on, and my coolant warning light came on, it overheated. It already has a new fan switch in the radiator, and the fuses are good.
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This morning I went to my car started it for 10 seconds the light on my dash said stop and to check coolant, I got a ride to get some coolant filled it up, drove to work than drove home after work and the coolant level is at the same place I filled it up as this morning. What happend that it was gone last night than fine today? 03 vw gti vr6 24v ....
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My coolant indicator light keeps returning on my 01 Jetta GLS 2.0
I have searched in the forums and read that its likely a coolant sensor and requires replacing the coolant tank. I am wondering if there are other possible causes as I want to drive it for another 3k before replacing tank (as I will be having timing belt replacement and coolant flush at that time). Previous owner had universal (green) coolant in and it will be replaced with proper coolant when the flush is done.
The indicator comes on within a minute of starting the car. The thermostat seems to operate just fine and car is not overheating. I have topped off with diluted water, it definitely has proper level.
Safe to ignore as long as I watch coolant level and temp?
On a separate issue: I tried to use code reader but it would not connect to my car (had successfully connected at some point prior), I believe it may be because I have an aftermarket radio (the K-wire issue?). If that is true, should it resolve if I swap the stock radio back in? I need to be able to connect to the car eventually when it is time to renew registration (for state emissions control testing).
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Is it possible that too much coolant (~1" above reservoir centerline) could cause a(n intermittent) low coolant temp MIL? In the fall, I had the common STOP coolant light, where the coolant level mysteriously dropped (no leaks anywhere); we topped up the res. at that time and all was fine. Lately, I have been getting a MIL for low coolant temp, and I see that the coolant level in the res. is mysteriously high (nothing added since the fall)!?!
I was about to swap out the thermostat and CTS, but is it worth it to remove a dram of coolant and see if the MIL comes back or not? (By 'intermittent' I mean the light is on for the duration of the drive, but only during about 50% of drives--otherwise it's not on at all...)
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