Question about 2004 kawasaki KLX 400 SR

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Coolant leaked into oil

I happened to notice one day that i didn't have any coolant in the resevoir so i unscrewed the oil cap and and oil and coolant mixture started pouring out of it. I know a little about cars and when something like this happens its either a head gasket or the block is cracked. Is this the same thing that would happen on a quad?

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Yes. Same thing. All 4 stroke engines work more or less the exact same way. Coolant in oil = head gasket, cracked block, and/or cracked head. Wish it was something cheap and easy but it's not.

Posted on Jun 01, 2010


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Driving home last night my car was overheating and going in to limp mode. i also noticed a few days ago that the heaters only work while on the motorway doing 70 mph.

Sounds like you're low on coolant. That's not good, because it being a sealed system, you should never have to add coolant. The level should always stay full. If adding is necessary it is almost certainly leaking somewhere. If you can't see any external leaks on the engine or hoses or radiator, check your oil sump for coolant contamination: pull the oil dipstick and look carefully for milky brown swirls in the oil. That's the color the coolant gets in the oil. Take off the oil filler cap and check there too for a brown sludge. Just precautions because worst case scenario, if that's where your coolant went, it probably means a costly head gasket job.

If it turns out to be low just from neglect, you may be alright, but you need to keep watch on the coolant level for a good 2 weeks or more to be certain it is not losing coolant somewhere. Be sure and bleed the air out of it too, when refilling coolant. I don't think that was what happened, an air lock, as the cause of your overheating, though.

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Yes safe to drive. Just keep an eye on the coolant level.. I didnt have the problem with the RPMs going up, but i didnt have a crack in my reservoir. I replace it once and after 4 months it happened again. Had to get another one. Not sure why it does this. But i ran it for 3 or so months with just adding coolant when needed. It started to over heat once so i had to stop (ran low on coolant). So just keep an eye on it.

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The coolant bottle is on the passenger side and black in color. Wait til cool and simply remove the cap by unscrewing it. Top off to the line on the exterior of the bottle and replace the cap. If the resevoir is empty (take a flashlight and peer in), start the engine from a cold temp. and turn the heater on high to ensure that there are no air bubbles in the system to create an issue. Fill the resevoir until you reach the level on the exterior. If it is empty you need to get it looked at and find this leak before it overheats and destroys the head gasket. Let me know if you need anything else.

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I have a 2000 Expedition and I believe I have a coolant leak and I can see that all the coolant that I add to the coolant plastic tank trickles down over transmission housing next to the oil pan. What...

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You have a leak. Look around on the driveway and try to determine if you have an external leak as opposed to an internal leak. If you see no coolant on the ground, suspect a blown head gasket. Do not continue to drive this car in this condition. If it does indeed have a blown head gasket, serious engine damage will occur.

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