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Engine Overheat when Idle or Slow
Posted by Davin [Email] (more from Davin) on Mon, 21 May 2007 20:20:48
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Hey Everyone,
I've had a beautiful '00 Aero for about 7 months now. No problems at all so far except for the past afternoon. I started the car on the side of the road while I was talking on the phone. (Idle, 55 degrees outside, auto climate enabled to 70 degrees cabin temp) After about 20 minutes I pulled out and got 100 yards before I got the red ! warning. I had no idea what it was until I started really looking around and noticed the engine temp MAXED. Pulled over right away, opened the hood and it was definately hot, but not cooking like you see sometimes on the side of the highway. I let it cool for a half hour and went on my way. A few hours later I got stopped in traffic at several red lights and it heated up again!
I found that if I was going 30+ mph it was fine, but any slow movment would make it overheat. My first thought was the fan not working. I stated the engine and opened the hood and it was spinning away. That puzzled me.
Long story short, took it to the shop. They diagnosed the problem as a faulty relay. The relay is supposed to turn on the fan when at a certain low speed, and it was not doing it every time. That explains the overheating when idling. If this situation sounds like something you might have, check the relays. It confused me because the fan was working at a stop, just not every time I guess.
posted by 68.167.96...
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