I have a 1993 toyota 4 runner sr5 v6 with 220,000 miles on it.i have to keep filling the radiator with waater/ coolant, but there is no leaking anywhere , and i i checked the oil for water but have none.the head gasket have been replaced at the 190,000 mark. need some advice thanks
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Re: loose coolant, but no leaks
You have a leak somewhere? it could be a leak onto a hot pipe and evaporateing,or a faulty pressure cap.was the head re torqed after about 5/6 thou/mls.put some clean paper under the car at night and see if you have some wet patches in the morning.hope this helps .adrian
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Sounds like your water pump may be not working, while vehicle is off try squeezing both upper and lower radiator hose you should be able to feel the fluid in the lines and the hose should feel firm and not squish all the way together. Make sure you used the right coolant orange vs green and mix ratio. after all this has been confirmed start vehicle and squeeze hoses again before they get to hot to make sure the fluid is moving and now hoses should be pretty hard to squeeze at all while the truck is running. if you don't feel movement of fluids or hoses are very squishy it could be a vacuum leak and worst case your water pump, hope this helps-
did you replace the thermostat when you put the radiator in,you could still have an air pocket in the system,recheck your coolant in the radiator when it is cold. the next thing is to verify the cooling fans are working,when you see it hot check to see if it really is hot or gauge is lying,if it is hot see if the fans are running to maintain cooling temp,if they are not check coolant fan fuse and relay and last fan motors
Instead of having it replaced, you may be able to find a shop that will braze that area for you, which is an often-performed repair procedure on radiators.
At 34,000 miles, the coolant doesn't have to be replaced, but it won't hurt.
If it's dripping slowly when parked, it's dripping much faster when it's running. The coolant system is under pressure when the engine is running and up to operating temp, and that is probably causing coolant to spray out of that hole. You can check this by leaving the engine running and looking in the approximate location of the leak you found.
Continue to check and replace coolant/water as necessary until you get the problem properly assessed and repaired.
if you are sure all of the above is correctly installed then the only othet thing i can think of if it isnt loosing coolant is either the guage or the sender unit is faulty,
if its not loosing coolant and the radiator isnt filled with muck then it really cant be anything else.
one other thing might sound silly but check that the thermo fan if its got one is coming on or if there is a plastic bag or something blocking the radiator