Question about 1998 Mitsubishi Diamante

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I have a 98 Mitsubishi Diamante that I just got out of the shop. I had the starter, alternator and 2 belts replaced. Less than a week later, I'm having more problems. When it was in the shop, they recommended replacing the radiator. Said there was a leak coming from "somewhere" but wasn't sure where. Well, my thinking is it just might not be the radiator...could be a hose or something else. I took their estimate and went on my way. This morning, when I arrived at work, there was smoke coming out from under my hood when I turned off my engine. I let it cool and went back out about 2 hrs later, raised the hood, to find antifreeze on the top of the motor, pooled in the grooves of the silver cover that is slotted. I added some antifreeze and it didn't need much...less than 1/4 of a new gallon I had. This afternoon I drove it home and it was fine. No smoking, no overheating, nothing. What the heck is up???? I drive about 16 miles each way to work and I'm afraid of getting stranded. However, if it doesn't need a new radiator, I don't want to replace it yet again. I already replaced it about 2 yrs ago. One friend suggested it could be the intake gasket and another suggested the thermostat. What do you say? I'm a my wits end and just spent $783 last week. Now this.....HELP!!!

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  • atllady65 Jul 13, 2009

    Yes, the cap was on correctly. I didn't see antifreeze anywhere but on the cover on the motor. Nothing on the ground. Had a friend who works on cars just tell me he thinks it's the upper intake. Will the black pepper trick help that? If it is the upper intake, how much am I looking at spending to fix that? I'm in Atlanta, GA. I know every shop charges different, but if I could get an idea, just a ballpark figure, that would be nice. And why did it act up this morning but not this afternoon when I drove it the same distance? Thanks in advance for your help!

  • atllady65 Jul 13, 2009

    Yes, the cap was on correctly. I didn't see antifreeze anywhere but on the cover on the motor. Nothing on the ground. Had a friend who works on cars just tell me he thinks it's the upper intake. Will the black pepper trick help that? If it is the upper intake, how much am I looking at spending to fix that? I'm in Atlanta, GA. I know every shop charges different, but if I could get an idea, just a ballpark figure, that would be nice. And why did it act up this morning but not this afternoon when I drove it the same distance? Thanks in advance for your help!

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It cannot be a intake gasket, it has to be the top radiator hose or the thermostat housing, check to see the gasket that seals the thermstat housing neck

Posted on Jul 13, 2009

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  • Mitsubishi Master
  • 14,036 Answers

It could be the upper radiator hose leaking.also your thermostat gaskets.could leak also.if you got radiator leak you will have coolant leaks around the radiator area.not on top of engine.what i would do check top radiator hose and any other coolant hoses on top of engine.besure to carry extra antifreeze on hand .until you get it fix.

Posted on Jul 13, 2009

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  • Mitsubishi Master
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Was the cap on correctly when you opened up to refill it? To verify a leak clean up any residue that is on the engine etc and let it sit...then check for anything on the ground, chassis and at any hose connections. Check for leaks cold and hot. When hot there is pressure in the system and may reveal leak, however, many water pumps leak better cold with the cap removed (pressure actually will push the seal against the shaft and stop it from leaking) " It's leaking and I don't know where" isn't a statement I'd ever permit to pass me by...My next question would be, show me where. That does nothing to instill confidence in that shop.
One note: if it does turn out to be a pinhole in the radiator, believe it or not, a tablespoon of black pepper actually works. Just don't use more than two.

Posted on Jul 13, 2009

  • Richard Scordino Jul 14, 2009

    The pepper thing works better for radiators. I would not take anything apart 'till I absolutely verified the leak source. I never take anything apart on an "I think"...that can get expensive. The reason it can leak at different times has a lot to do with the expansion rate of aluminum. When manufacturers began using it they had to re-design gaskets because of this...With so much expansion and contraction, the gasket needs to stay pliable and able to "follow" parts as they move, without breaking their seal. If possible, you can re-check intake bolts to make sure they have not loosened up. Only do this on a cold engine. But, that's assuming the leak is there...that hasn't really been established yet.An underhood leak can blow coolant all the way across the engine...you need to find the source.

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