If the cooling system has no bleeder valves to vent air, you may have to temporarily loosen a heater hose to get all the air out of the system...Also check to see if there is water in the oil...If there is water in the oil then it could have a head gasket problem..Did you ever replace the thermostat? If it is stuck then it would also cause overheating...
Excessive exhaust backpressure because of a clogged catalytic converter could also cause overheating..Also check belt tension and condition. A loose belt that slips may prevent the water pump from circulating coolant fast enough and/or the fan from turning fast for proper cooling...Another thing it could be is a faulty
Water pump -- Any wobble in the pump shaft or seepage would call for replacement. In some instances, a pump can cause an engine to overheat if the impeller vanes are badly eroded due to corrosion or if the impeller has come loose from the shaft. The wrong pump may also cause an engine to overheat. Some engines with serpentine drive belts require a special water pump that turns in the opposite direction of those used on the same engine with ordinary V-belts...
Also check the Fan -- With mechanical fans, most overheating problems are caused by a faulty
fan clutch, though a missing fan shroud can reduce the fan's cooling effectiveness by as much as 50% (depending on the fan's distance from the radiator) which may be enough to cause the engine to overheat in hot weather or when working hard.
i have a 89 acura integra that is running just above the middle on the white temp line. i have had recently a new radiator and within the last year a new water pump and thermostat. but its still hotter than it should be i think. the fans come on i know when the a/c is on for sure but not sure when the a/c is not on. the old radiator had tons of corrosion and alkali/ calcium build up so i'm wondering if that could still be in the block somewhere and causing the poor circulation still. and if so what can i do about it? my email is [email protected]
i have a 89 acura integra that is running just above the middle on the white temp line. i have had recently a new radiator and within the last year a new water pump and thermostat. but its still hotter than it should be i think. the fans come on i know when the a/c is on for sure but not sure when the a/c is not on. the old radiator had tons of corrosion and alkali/ calcium build up so i'm wondering if that could still be in the block somewhere and causing the poor circulation still. and if so what can i do about it?
Out of curiosity have you verified the temperature that your gauge is showing you? When you say it gets hot, are you using the gauge in the dash as a reference, or is it getting hot to the point where you're steaming over, blowing radiator cap gaskets, etc? I ask, because if you're going by the gauge in the dash, keep in mind that those gauges can go bad with little notice. If you've ever overheated seriously, it is possible the temperature sending unit may have been damaged and is now reporting inaccurately. In fact, the sending unit might have just gone on it's own, as well. Also, don't confuse the sending unit with the temperature sensor. They are two separate entities. One reports to the ECM, the other sends the temperature to your gauge.
There are a few other things that could cause overheating conditions. The radiator could be plugged. You could have a leaking head gasket that is allowing exhaust gas in the cooling system. Did the vehicle overheating causing you to replace those things, or did you notice a leak from the pump and replace it without it overheating first?
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