Question about 1999 BMW 318 ti

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Overheating I replaced water bump (was leaking} but still overheating,this time radiator upper hose is hotter then the lower hose plus water bumping out though the radiator cap with pressure what else to I do

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Change thermostat.

Posted on Dec 24, 2008


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Dodge neon overheating


I would be thinking radiator or water pump. When the engine is warmed up and the upper hose is hot, feel the lower radiator hose. It should be hot too, just a little cooler than the upper hose. If there is some blockage in the radiator, the lower hose may feel cold or just lukewarm.
Even though the water pump doesn't leak, the impellers may be made of plastic and have considerable wear. That would restrict circulation.
The heater core should not be an issue. Heater cores do not cause overheating even when totally plugged up.

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Remove the thermostat and run the engine at idle until it starts to overheat. If it does then the radiator may have clogged veins and needs replacing.

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the timeing, Mazda will run hot if the timeing is rong.

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replace the cap , its allowing the system to over pressurize, also, you could have an air bubble thats moving around in the system, always make sure that you fill the radiator to just cover the radiator fins inside, this allows a place for expansion to happen. what you need to do is BURP your system, leave the cap off and start the vehicle, ( before doing this step,, make sure that you've replaced the thermostat, spring towards the motor , it only works one way!! ) once you see the fluid inside the radiator moving, it means the thermostat has opened, and your fluid level should drop down, slowly add more until the fins are just covered, and wait for it to close and recycle one more time, refill again, that should purge the system of unwanted air,, replace the cap, and fill the over flow tank to the lower level line,, and you should be set

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While the car is running look into the overflow and see if you see bubbles going into it. If you do you have a head gasket leaking. Also while the car is running, feel the upper radiator hose temp. and feel the lower radiator hose temp and compare how hot they are. If the upper seems to be alot hotter than the lower hose, your thermostat is stuck shut.

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1994 Honda Civic LX\overheating within 2 mile drive


Remove and raise upper hose at thermostat end and remove lower rad hose.
Fill rad with a hose and watch for flow from bottom rad hose and/ or bottom rad hose connecton.......water should fall though rad easily.
Honda rads are cheap.....any restriction....replace rad.

Remove thermostat....fill thermostat housing with hose and watch for water flow at bottom rad hose.
Flush good.

Remove heater hoses.......flush back and forth until a good flow is present "With heater control set to hot" if no or poor flow....replace heater core.

Stop leak can plug everything.

Also.......not likely causing over heating....but ....at your mileage,if you do not know if the timing belt has been changed.....CHANGE IT NOW!
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Car began overheating, so we added antifreeze and water. Then the next day, it all leaked out. Upper hoses appear to be ok. Are there lower hoses?


It should have a lower hose also. Or you could check around the water pump, they have a weep hole on it and they usually leak if the pump is bad.

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You have replaced the upper rad hose. Was this done because of a leak? Was it replaced because overheating was occuring? If overheating is a problem you may have to look at some other things.1 Cooling fan 2 Thermostat 3 Head gasket

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First, plastic tube may be the overflow vent from the coolant bottle.Check to see where the attached end goes. You are going to have to check engine for coolant leaks (carefully refill system without spilling anything, then look for dripping anywhere. Look for leaks from all hoses, fittings radiator, water pump etc) After checking for leaks, start it up and check again (watch where you put your hands though) While running, check that the fan comes on when the vehicle reaches operating temp.(no fan, check fan motor, sensor & relay) Turn the heat on (does it have heat?) Check temp of lower hose and upper hose. If overheat happens, is lower hose still cold? (likely bad thermostat). If you found a leak, replace whatever is leaking...best insurance is to change thermostat after any overheat. Last, is there any white smoke from tailpipe, does engine run rough? If so, could be a failed head gasket or crack in cylinder head. (at this point last thing to worry about unless there is excessive smoke or rough run or oil in radiator or coolant in oil).

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