sprinter10 Posted November 19, 2010 Report Share Posted November 19, 2010 Hi I am Mark Gilmore and I am new to this forum, and being a caddilac owner. I puchased a 2000 STS with with 118,000 miles 32valve 4.6L northstar engine. I am 16 years old and am driving it with my parents under my permit tring to get all the bugs worked our for when I get my license in less then a month. It has a few problems I have been working on and fixing but nothing major until I finally took it out on the highway the other day. After cruising for about 10 miles the water temp jumped up to 3/4 and I got nervouse watching it. It then dropped straight back down to 1/2 way. 5 miles later it began to tick up at an increasing rate where I funally pulled over and it went into the red. I had the heat on full blast in side the car and noticed it wasn't very hot. After a little bit of idling it it went down a little and then stopped. I shut it off for a little checked the watter and it was about an inch below the line where it is suposed to be filled to. I put 2 water bottles of water in it then started it back up. Then the temp started to drop and it fell straight to half way. I had heat blowing again inside the car. I was driving it really easy trying to keep it in overdrive with a lot of long hills. The water temp just ticked up above half way and I noticed the heat that I had on full in the car was no longer as hot and was starting to blow cooler again and then it continued to climb untill I pulled over at 3/4. I let it run on the side of the road until it got it back out of its system. Both electronic fans were running when I pulled over and popped the hood. After pulling over one last time I finally made it to my destination that was 40 minutes away. The water level was then another inch below the fill level so I filled the tank up. On our way home I drove it really easy not going over 55 maby hot 60 once and only twice the water temp climed close to 3/4 and dropped back down to half way never had to pull over. When I pulled over the first coupld times there was steem and wetness around the cap on the colant container and damp in a few areas. So I am guessing thats where I was loosing a little bit of water. I am thinking it could be a thermostat because it seemed like the water just stopped circulating causing the hot water to stop going to the heater core but am not shure. I know i want to flush the system out and get out any sludge that could possibly be clogging up the radiator. The car sat for around 6 months before I bought it and it just started getting cold so That day might have been the first day turning on the heat. Maby could have loosed something up triggering this? There was no raise in oil level to lead me to belive it would be a head gasket. And I was not able to run any codes yet. I am going to later today hopefully when I get to my dads. The fluid never went empy always was more then half ful when I owned it and ran it for just over 300 miles now so I don't think it is an air pocket but I am not ruling anything out. Thank you in advance for your help I am looking forward to being part of this forum and helping out with some of my experiences. Link to comment Share on other sites More sharing options...
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