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2007 Suzuki Forenza. 110,000 miles. A while back the coolant res. busted and my car red lined overheated. I got that fixed and put new coolant in it. A few months pass by, I’m driving down the road, it runs hot again. So i replace the thermostat. Ran normal for a week. Today, it ran hot again. It will run normal for about 20 min, then go between 3/4 and red line for a moment, then back to normal. Heat works. Fan works. New coolant. New thermostat. Any suggestions?
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Sounds like you’ve got a big ole gas bubble in the system.
I’d burp the thing, and give it another go. Eric’s got a fine video on that… I’ll edit this post to include the link unless CollegeMan beats me to it. 🙂
-Hinoki
Edit: Here’s the YouTube link to Eric’s video: https://www.youtube.com/watch?v=zUpXgAJ1gjU
I’ve lost track of how many Forenza headgaskets I’ve seen fail. All too often, especially if it’s actually been overheated, the head is warped beyond spec as well. You would perform a block test next, which is easier than most cars because of the coolant tank naturally having a large air space in the top half.
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