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Old 10-21-2002, 09:22 PM
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Talking Water question-2.2 4cyl S10

Water was coming out of the weep hole on my sons S-10, 2.2 4 banger. We bought a water pump and put it on. Fairly straight forward install. Refilled the rad. and went for a drive. eratic behaviour on temp guage. Readings swing widely , up and down. 140 to 210, over and over as you drive. Finally it overheats and pegs at 260. Rad has lost 1/2 it's water. No visible leaks. Spark plugs are not steam cleaned. Oil is OK. Can't see vapor from tailpipe
Doesn't hold pressure long, you can safely remove rad cap while hot, runnuning or stopped
No water in oil, none going into cylinders, no steam to be seen anywhere. So where is the water going? Anyone got one of these little trucks?

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Old 10-21-2002, 09:33 PM
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Water's pouring out my weep holes just reading your sad post! Sounds like you got a bad water pump from the parts store if I read you right - was ok B4 the new pump and now it is spewing and the engine is overheating? Water isn't circulating for some reason, either the new pump is frozen (fan belt would tell you about that!), the impeller is slipping on the shaft and isn't going round or the thermostat has gone south. Regardless, the pump has a bad seal and should be replaced by the store.
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Old 10-22-2002, 06:09 AM
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Yeah, I'm weeping too. The water pump works and we pulled the thermostat,(which took care of eratic temp guage). But it STILL loses 1/3 to 1/2 it's water. With NO trace. I'm thinking cracked head or block, but wheres the water going? Not in the oil, not in the cylinders, not out in the engine compartment, not out the overflow.
It is getting close to Halloween I guess.
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Old 10-22-2002, 06:47 AM
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Do you have foam coming out of your radiator when the radiator cap is off? Are there any bubbles in the water? Does the exhaust have a sick sweet smell (antifreeze in the exhaust)? What does the water look like in the radiator when the engine is running? Is there any oil sheen on the water in the radiator when the engine is off?

If you have a cracked head or block or blown head gasket, one of the above indicators should show up.

I have had the mysteriously missing water problem in the past and have traced it to an almost invisible pinhole leak in a hose. Didn't even leak enough to make a puddle anywhere but when the engine was running and the water was pressured, it ejected a stream the size of a human hair and vented the radiator. Very hard to locate.
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Old 10-22-2002, 11:21 AM
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No foam, no bubbles, no sweet smell. no oil sheen. Matter of fact we are only using 50-50 mix, just so we could detect an odor. When it runs the coolent looks and acts normal. In a trip of 30 miles, it will lose 3/4 of a gallon.
I'm wondering if it is getting into the exhaust, condensating in the muffler and not coming out as a mist. Only problem is the lack of that sweet smell in the exhaust. Shoot, I don't know! I think we will just trade it in on a 1/2 ton Dodge we've had our eye on anyway.
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Old 10-22-2002, 11:51 AM
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have you checked the heater core to see if it is leaking? If the rad is not holding pressure then it is going somewhere.and since you have checked everywhere else then you may as well check the heater core.
also it could still be a cracked head I have repaired countless 2.2 and 2.5's that the head cracks between #1 and #2 cyclinders and most test done on the car will not show it.

[ October 22, 2002: Message edited by: meanmachine666 ]</p>
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Old 10-22-2002, 05:12 PM
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Not the heater core. Your info was what I needed. So...the little buggers are prone to crack! Where is the @^&*%@# coolant going? I hate a mystery. What if I drill a hole in the bottom of the exhast pipe before it enters the muffler?
We have a shop, where we can run it, light it, check it all over. NO puddles, no steam, nothing. <img src="confused.gif" border="0">
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Old 10-22-2002, 07:23 PM
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Your rad cap is not holding pressure, hence your engines coolant system is dumping it's coolant through the overflow onto the road. If the upper rad hose is high and hard when it's warmed up but is soft at other times then your cap is not sealing properly. The system must be pressurized to work properly, even an indentation in the rubber for the cap is enough to bleed the system down during operation.

Replace the cap and the temps will stabilize also.
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