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Re: 3800 cooling fans quit sometimes causing overheating
Sounds like a poor connection or loose connection, stasrt with the battery and clean and tighten cables. then check starter connections, Don't forget to disconnect the battery before you work on starter connections! There are some good contact cleaners available at your local auto store.
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I presume the problem is overheating? Be sure you are using a new 195% degree thermostat...these motors are usually not a problem of running hot...the best thermostat is the new "fail safe" design. This thermostat is designed to freeze open if fails...never closed to cause overheating...a few more bucks but worth it. This is a huge cooling system on your Buick...could be early signs of failing water pump, or restricted radiator flow...sometimes just needs a new radiator cap. Hope this helps.
RADIATOR COOLING FAN NOT RUNNING COULD BE BAD ENGINE.COOLANT TEMPERATURE SENSOR IS FAULTY IF COOLING FAN IS NOT TURNING ON AT SET TEMPERATURE OF 196 TO 203 DEGRESS.CHECK SEE COOLING FAN RUNNING WHEN ENGINE RUNNING HOT.IF YES FLUSH RADIATOR , FLUSH ENGINE BLOCK, HEATER CORE,REPLACE RADIATOR CAP.MAKE SURE YOU HAVE 50/50 ANTIFREEZE AND WATER IN THE COOLANT SYSTEM.CHECK WATER PUMP WEEP HOLE IF LEAKING REPLACE WATER PUMP. IF COOLANT FAN DONT TURN ON 196 TO 203 DEGREES, YOU HAVE FAULTY COOLING FAN,SHORT IN FAN WIRING OR ENGINE COOLANT TEMPERATURE SENSOR FAULTY.IGNITION TIMING WILL CAUSE ENGINE TO OVER HEAT.
First confirm that the engine IS actually overheating - steam, no heat to the interior etc. Sometimes a temperature sensor will fail and give a misleading 'overheat' reading on gauge. For that matter sometimes the gauge can fail and give the same misleading reading. Check that the cooling fan comes on when the engine temperature starts to rise above 'normal'. If not check (in order) fan fuse, fan relay, fan sensor, fan. Real overheating is caused by a lack of coolant AND/OR lack of coolant flow. Modern cooling systems are 'closed'. In other words there should be little or no loss of coolant. If the level is significantly low you have a leak....either external or internal. With the coolant topped up to the correct level and the radiator cap on, run the engine and look for visible leaks...hoses, valves, radiator etc. Internal leaks, eg. head gasket will usually be accompanied by white exhaust smoke (steam), hard starting, rough running and bubbles in the expansion tank. Sometimes, though NOT always, you will find the engine oil has a milky look and/or engine oil will be mixed in with the coolant.
SOUND LIKE ENGINE OVERHEATING,CHECK COOLANT LEVEL MAKE SURE YOUR RADIATOR FULL OF ANTIFREEZE.IF YOUR COOLANT OVERFLOW JUG IS EMPTY COOLANT LEVEL IS LOW.NEED ADD MORE COOLANT TO OVERFLOW UNTIL COOLANT STAY AT FULL COLD MARK. DONT OVER FILL COOLANT OVER FLOW JUG.IF COOLANT OKAY ENGINE OVERHEATING REPLACE THERMOSTAT.MAKE SURE ENGINE COOLING FAN IS WORKING IF YOU COME TO A STOP CAR SITS FOR A LITTLE WHILE START OVERHEATING THE COOLING FAN NOT TURNING ON , BECAUSE COOLANT FAN FUSE BLOWED OR YOU HAVE BAD RELAY,THE ENGINE COOLANT TEMPERATURE SENSOR FAULTY.IF YOU HAVE THE CLUTCH TYPE COOLING FAN, MAKE SURE WHEN TURNING CLUTCH FAN WITH HAND COOLING FAN SHOULD HAVE RESISTANCE WHEN HOT.IF CLUTCH FAN FEEL WOBBLY AND LOOSE REPLACE IT.TAKE VECHICLE TO AUTO ZONE OR ADVANCE AUTO PARTS OR ANY AUTO PARTS STORES THEY WILL CODE SCAN CAR FREE AND GIVE YOU THE CHECK ENGINE LIGHT TROUBLE CODE TO SEE WHAT CAUSING CHECK ENGINE LIGHT TO TURN ON.
Overheating at idle is usually due to the engine cooling fan not working. Could be a bad fan relay (most common cause), bad fan thermostat, or a bad fan motor. Replacing the power window motor is quite difficult, I would leave this to the pros unless you are really mechanically inclined. I replaced one on an Aerostar, but I don't think I'd try it again.
cooling fan will not come on until about 230 degrees, if fans still do not work. check the fuses and relay. if ok then run a wire to fan from battery.on fan side connection, run a wire from battery positive to fan connection. run a wire from negative to ground connection.if fan will not come on it is either bad or the coolant temp, sensor is bad. because this sensor send info to pcm from various running conditions. it is very important that this sensor works. it can cause;
replace your cooling fan motor relay because if you dont eventually your radiator will explode and this will cause your engine block to crack and then if your fan isn't blowing the engine will continue to overheat and the engine will seize and then you need a new engine. A cooling fan motor relay is around $30.
I dont think the transmission has anything to do with your overheating problem...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.