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Old 05-02-2010, 08:00 PM   #1
SaturnSL2Guy
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Default Coolant issue

Hey guys, I am wondering if I can get some help with my coolant issues. It's starting to get warm here in New England and I have been having some cooling issues with my car. During normal driving, my temp gauge hovers a little above 1/4. Thats fine, and usually, it won't go past that. However, lately, if I get stuck at a long red light, the temp of the car jumps way up past halfway, sometimes almost 3/4 within a minute of me being stopped. It cools down as I start driving again, and does it again if I sit for more than a minute or two. I tested the fan, I know it works, but I have a hunch the relay or my thermostat is bad. I am just curious as to why my fan isn't coming on sooner? At what point on the gauge does the fan typically turn on? I have a good coolant level, and everything seems ok, so why is it heating up so fast? It hasn't even broke 75 degrees yet? thanks for the help!
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Old 05-02-2010, 08:02 PM   #2
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Default Re: Coolant issue

I should also add that I have gotten no coolant light or engine light on the dash. Do I have a thermostat/fan relay issue, or do they usually run this hot?
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Old 05-02-2010, 08:29 PM   #3
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Default Re: Coolant issue

If you haven't already, replace your ECTS - engine coolant temperature sensor. Visit our How-To Library and check the "sticky" threads on this sensor, along with links to videos by member richpin06. Otherwise, as long as the fan comes on before the gauge reaches the red zone, and this brings the temperature down, the car is not overheating.
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Old 05-02-2010, 08:53 PM   #4
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Default Re: Coolant issue

Thanks. I replaced the ECTS about three months ago when it started messing with my idle. I know it's not overheating, it just seems unusual for it to heat up that much in a short period of time
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Old 05-03-2010, 02:48 PM   #5
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Default Re: Coolant issue

There is not a lot of coolant in the system, does not take long to heat up from normal operating temperature when stopped or moving very slowly (e.g., below 25 mph) thanks to reduced air flow through the radiator.

If the temp gauge is holding at/below 1/4 scale on the open road (and the ECTS is OK) you may have a stuck open t-stat. It normally should sit at about 3/8 scale.
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Old 05-04-2010, 01:28 AM   #6
mjoekingz28
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Default Re: Coolant issue

Ask Wolfman about his manual radiator fan switch if it bothers you looking at the needle rise.

For me, I just switch on the AC.
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Old 05-04-2010, 06:34 PM   #7
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Default Re: Coolant issue

I am having the same problem with my sc2 where it would heat up at idle first i changed the ECTS and then the radiator cap then the next week i noticed my raditor was streaming huge amounts of fluid on the driver side, I would suggest getting your raditor checked...
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Old 05-17-2010, 07:48 PM   #8
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Default Re: Coolant issue

I thought I had a problem when I first noticed the guadge going up to 2/3 when I idled for 2 or 3 minutes but I only heard the fan after climbing a 5 mile long hill on a 100 degree day so I think the the behavior I described is normal.
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