Question about 1999 Chevrolet S-10 Pickup

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99 Chev. S10 is losing water, but can not see evidence of the water leakage. We have had the heads replaced a year ago and also put in a new thermostat and flushed out the radiator 3 weeks ago. Not sure what is going on

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Have the coolant system checked under pressure and leave it for a few hours, it should hold, if not it could be leaking internally

Posted on Aug 24, 2010

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Ifull the tank in the radiator but it will disaper but no leaking in the hose what would i do

If you are losing coolant then you have either an external or internal leak.
If you can find no indication of an external leak from the radiator, the radiator overflow tank, any of the hoses on the system or around the water pump fitting then you may well have an internal leak. Check the radiator overflow tank carefully and the hoses to it for any signs of external leakage.

An internal leak of coolant can be via a failed cylinder head gasket or a crack in the cylinder head or both. Coolant can then leak under pressure into the cylinders or into the engine's lubrication system and will then mix with the oil. Check the condition and colour of your oil for evidence of coolant contamination. Check your exhaust for a constant flow of white exhaust emissions which is evidence of coolant entering the combustion chamber.

If you have run the vehicle with the engine overheating this will generally cause failure of the cylinder head gasket and possibly a crack in the cylinder head.

Feb 18, 2016 | 2001 Ford Escape

2 Answers

Have 1995 ford econovan petrol had stem seals replaced 2 years ago motor idles perfect runs really well not losing water oil still clean blowing white smoke from exhaust mainly on mainly on acceleration

Blown head gasket. Pull the spark plugs. The cleanest one is where it is blowing or sucking coolant. Sorry. White is water/coolant. black is gas. bluish is oil.

Sep 02, 2014 | Cars & Trucks

1 Answer

Mitsubishi shogun 2004 2.5TD

Hi There, How about letting us know your given name, seems friendlier when answering your questions? Okay the problem your friend is having can be caused by something very inexpensive, the radiator cap, or as expensive as a replacement cylinder head. I suggest having the pressure cap tested which means using a cooling system test kit. If the release pressure of the radiator cap has become too low, coolant will be expelled. Also have the radiator tested. If there is a pressure drop look for where the leakage occurs. Other common places of leakage are from core plugs on the engine block and the water pump. Leakage from the pump is many times only evident with the engine running, but be careful only to observe and not to touch anywhere dangerous. If there is a pressure drop but with no evidence of leakage from the parts already mentioned but no leakages are evident, check inside the cabin to be sure that the leakage is not from the cabin climate control. Pressure should be maintained for at least fifteen minutes a little above the pressure stamped onto the radiator pressure cap. If all else fails it is time to suspect the cylinder and cylinder head gasket. If the cylinder head gasket is blown it can sometimes result in a mixture of oil and coolant, evident from the changed colour of the engine oil, but can also leak into the cooling system and result in the symptoms you report. If the engine is petrol with an alloy head, skimming and a replacement of the gasket will usually sort out the problem. If it has a diesel engine with a cast head, the head may be cracked, requiring the cylinder head replacement. Regards John .

Jul 26, 2014 | 2002 Mitsubishi Pajero

1 Answer

1997 chevy s10 pickup antifreeze leak, need help.

Check your intake, sometimes water runs thru the intake to cool it down and it can crack on the inside. When this happens it will send water to cylinders where it is burned. Also, any leaks at the water pump?

Mar 27, 2013 | 1998 Chevrolet S-10 Pickup

1 Answer

I own an 1985 chev g20 van. since october i have had 2 brand new water pumps fail. currently on the 3rd. one was from ontario, the other from alberta. is it normal to have this kind of failure rate. the...

This IS unusual!

Do the pumps actually fail, or is leakage the issue?

If leakage is the issue, you may have a damaged gasket mating surface on the engine, that prevents getting a good seal on a new gasket and water pump.

If this is the case, you might try putting on 2 gaskets to make up for the damage and use a good sealer (personally I like Coppercoat).

Hope this was of some small measure of help.

Good luck!

Feb 25, 2011 | Chevrolet G20 Cars & Trucks

3 Answers

Chev s10 1998 over heating water in oil can i do a quick fix with gasket sealer an still drive truck until i can afford to replace gaskets

Over the years I have seen quite a number of sealers advertised to repair gaskets etc. There are newer ones out that make the same claims (also expensive @ about $100). Though it is possible that they work, I have no idea for how long. As always, the best cure for a cylinder head gasket problem is still to actually do the repair.
Regardless of how you correct the problem, make certain that you drain the oil and filter or you will be looking at a bearing failure shortly.

Feb 04, 2011 | Chevrolet S 10 Cars & Trucks

2 Answers

1997 pontiac bonneville 4 door v-6 coollent leackage but no signs of leakage,lose of power, lose of oil pressure, trubles starting at times.

You may have an internal leak. It could be leaking into the cylinders past a head gasket. Check the spark plugs. Pull one out and if it has white residue on the electrode then it's burning water/coolant. Also check the dipstick. If it has a sort of frothy watery looking oil on it, then you're leaking into the crankcase.

Nov 09, 2009 | 1997 Pontiac Bonneville

1 Answer

Water in oil

I have yet to see a cracked head on a 22R,so more than likely a blown head gasket,unless you overheated and warped the head and worst case a hole between the cylinder wall and water jacket(this is pretty rare).The only way to tell short of using some expensive tools or taking to your local shop is to pull the head and inspect the gasket for leakage wich is generally fairly obvious(separation of the gasket layers,oil and water between water and oil passages)and checking the head deck for warpage.If there is obvious leakage in the gasket you're looking at a top end gasket set if the head is slightly warped you can get away with a thick graphite head gasket,I personally use these as they are very forgiving on slightly warped and scratched head decks and inepensive also,but a severly warped head will require milling at a machine shop or replacement.

Apr 04, 2009 | 1987 Toyota Pickup

2 Answers

Losing engine coolant

It could be the cooling fans arent working or worst possible case head gaskets are leaking in the combustion chamberSo blown head gaskets..Make sure its not getting into the oil.Thats not good..Hope this helps you and good luck..

Apr 02, 2009 | 1999 Oldsmobile Intrigue

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