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My sister-in-law has a 2007 Suzuki Forenza, and she has had many problems with it. It's been running rough for awhile and she recently got the spark plugs replaced. That helped some. But right now she has a problem where it keeps overheating. I assume she means the needle goes up to the H and stays there, then comes down then goes back up. She texted me the other day when she got to school and said it freaked her out b/c it overheated almost the whole time. The other thing that she said it is doing is when she first cranks it up and while driving off slowly she has this jumping feeling. I haven't had a chance to ride in it to get a better description, but does anyone have any ideas especially with the overheating? She is going to school so money is kind of tight. She has taken the car to a mechanic last week and he couldn't find the cause of the overheating. Thanks for the help!
 

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Please tell her to check the coolant level... This is starting to sound like classic blown headgasket symptoms.

Remember to check it when its cooled down... if its low, top it up and check again the next day. If its loosing coolant and there are no obvious leaks, its most likely the headgasket which would mean coolant is getting into the engine and being burned. That would explain the rough startup....

Also check the oil level and make sure the oil does not look "frothy or milky" - this would mean the coolant and oil have leaked into each other and have mixed which is very bad.

I don't know how much either of you know about cars and overheating, but when the needle starts going up into the Hot zone, you are not supposed to keep driving it. That means you are already overheating and should immediately get the temperature down (in this case by shutting off the car) to avoid further damage. If you continued to drive it while the needle was at H, you easily could have warped the head and/or other damages.
 

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I had this exact same problem a few years ago. My car's temp would get super high, then suddenly come down. I stopped and saw my coolant resevior was empty. I filled it up like three times. I was also starting to have rough starts. Until one day in winter, it finally wouldn't start. I had brought it in for a oil change earlier that year. The guy said I was low on coolant, but they couldn't see any place it was leaking. In hindsight, I am surprised the guy didn't have a better idea what was going on. I know he is just an oil guy, but one would think he would see a lot of different cases.

Anyways, I finally brought it in to the dealer. Sure enough, it was a blown head gasket. The good news is that it was covered by the warranty. The pathetic news is that I only had 40,000 miles on it! The total bill was over $900. I didn't have to pay a dime.
 

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Unfortunately it seems to be a common theme for these cars with the stock headgasket.

Perhaps the gasket material was inferior or defective, or perhaps the headbolts do not really apply enough pressure to keep it sealed.... what ever the issue many people have gone through it. I've changed mine over to a MLS Cometic headgasket with ARP head studs, and that was the end of the problems.
 
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