Evo8 over heating
My evo 8 is starting to over heat after cruising at about 2.5-3k RPM in fifth gear after about three miles. It goes right back to normal running temperature if I just pull over and idle for about a minute. Heater, ac, and radiator fan works fine, and so far I've only had this problem in fifth gear. It only starts to over heat in other gears after doing like four or five pulls to redline. Has anyone had this before?
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Change the thermostat, make sure both fans are turning on.
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Those are basic things to start with
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flow test your radiator
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sticky thermostat, check for air in the system, make sure the fan kicks on.
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Also check coolant lines for pin hole leaks.
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Thanks guys I appreciate it! :)
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Originally Posted by iD33
(Post 11380950)
Also check coolant lines for pin hole leaks.
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Check the basic and cheapest items first there's also a bleeder valve you can get air out of the system if there's any.
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Is your coolant in the res vanishing? If your radiator has a leak that you cant see with your eyes and your fluids drop enough system could get air in it and cause it not to flow. Fix what you know is broke for sure first to start your process of elimination. New radiator, and while that's off re place your tsat and any hoses that need replacing. If any do, replace all of them as not to create a weak link. Don't forget to check water pump for moisture. Now what's left. Temp sensor. You can use a Lazer temp thermometer to see if it actually reading true. I know sometimes the actual temp gauge craps out. Check both fan cycles. Check for exposed wiring. After your system visually checks out do a pressure test on it. If it drops more quickly than it should, and or still loosing coolant. Do a leak down test. Could be pinhole in head gasket getting ready to completely fail. Which could have been caused by your leaky radiator that could have possibly caused improper cooling, causing hot temps, causing slightest head movement, causing water to find it way. Just be thorough with your inspection and elimination process. If I remember correctly the only other way to loose coolant is a broken turbo housing and something with the idle speed control servo on the Throttle body, the o ring. Hopefully it's a minor electrical. But wire chasing is also a pain.
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Make sure your radiator and both radiator hoses are filled with coolant. And double check your coolant reservoir hose to make sure there isn't a clog. I've had this problem in my old eclipse.
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So I replaced the thermostat, topped off the coolant, and bled the system today. It idles just fine, and the temperature doesn't rise. Only now the temp gauge drops after I drive it around. I took it on the highway and the needle went down really close to the c. I figured it had to be a faulty gauge, but I pulled over to check things out just in case, and the car was idling pretty high just like it would on a cold start. This thing has me so confused!
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Get an IR thermometer and see what it registers when you aim it at the Tstat housing. Something isn't jiving here. It's acting like your sending unit is bad. How long did you drive it after you did the stat? Long enough to get to operating temperature?
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Originally Posted by Cal City Evo
(Post 11383062)
Get an IR thermometer and see what it registers when you aim it at the Tstat housing. Something isn't jiving here. It's acting like your sending unit is bad. How long did you drive it after you did the stat? Long enough to get to operating temperature?
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What is the ambient air temp where you are located? If its really cold outside, once you get moving at a good rate of speed, the cold air will drop the temps in the radiator. Put a piece of cardboard in front of the rad to block airflow and see if it still drops.
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