Question about 1995 Toyota 4Runner

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I have a 1995 4runner.The waterpump went bad.I put a new one on.It had a lot of dirty brown liquid in it.I had the system flushed. It started overheating.I put a new therm in it.Heater not working.I blew out all lines took therm out and tested it and it was working.Put it all back together,heater was working when it come up to temperature.Drove it,heater stopped working,and it overheated again??

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  • machtech607 Dec 11, 2009

    The 4runner has a 3.0 in it. It has a timing belt?

  • machtech607 Dec 11, 2009

    there is no water in the oil and no oil in the water

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It seems to me that you have one of two problems. one bieng a large air pocket in your cooling system and the other bieng a blown head gasket. it is pretty rare that a head gasket be blown enough to leak coolant into the oil or vice versa, i does happen but not very often. the biggest indicator is excess pressure in the cooling system because exhaust gasses are entering the cooling system and causing airpockets in the cooling system. so start the vehicle cold and squeeze the upper radiator hose and see how long it takes to get firm/hard. most vehicles wont build any substantial pressure in the cooling system until it has been driven or idled for quite some time (like an hour or two). if it builds a good amount of pressure really fast or blows white smoke after its been warmed up it may be a blown head gasket and you need to have a "block test" done at a repaiar shop. this test will detect exhaust gasses in the coolant (if they are there) and tell you for sure the heads need removed. if it doesn't build rediculous pressures turn the vehicle off and wait until its cold, then remove the radiator cap and start the vehicle. while the vehicle is warming up keep topping the radiator off with coolant until the vehicle has maintiained the same temperature for roughly half an hour this will ensure the thermostat has opened a couple of times and most of the air should be purged from the system. then replace cap and drive it. if it fills back up with air its definetly a head issue, especially if it blows all the coolant into the resovoir.

Posted on Dec 11, 2009

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Dirty brown, or like a milk shake, it a sign of oil and coolant mixed. This may be from a past repair, or a new issue. A head gasket could be the issue, but the 2.4 four cylinder has a problem of the timing chain wearing through a water jacket under the timing cover (You don't see the wear from the outside) and eventually leaks coolant into the oil.
I recommend getting the coolant system pressure tested to see it it holds up.If you are lucky, no damage has occured, as coolant mixing with oil is bad news!
Good luck, hope this helps out.

Posted on Dec 11, 2009

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