Question about 1997 BMW 318

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318ti overheating try=eid to locate the air bleeder valve on engine. just replaced my radiator and thermostat.

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  • tenross Oct 07, 2008

    i have just changed my expansion tank on the bmw 318i.the car is no longer overheating but the coolant warning light remains on

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Hi there, im having the same problem with my 318i.
I have found out that the viscous fan was not running properly and i could stop the fan with my hand when the car was at running tempurature. dont use your hand to check yours, use a peice of wood or something.

Posted on Jun 01, 2008

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1 Answer

Procedure to release an air pocket in the cooling system. Hoping Fan runs! :P


Is there an air bleeder valve near or on the thermostat housing? Crack it open to see if air escapes.
Usually to remove air from cooling system, you keep the radiator cap off after filling, start the engine and wait until the thermostat opens and the car has reached normal operating temperature, then shut off engine, top up the radiator and the overflow tank, replace the rad. cap. Try that to see if you can get all the air out. If still overheating, do check the fans. Then could have the coolant system pressure tested for keeping pressure in the system and no leaks.

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You can have look air in side.Did you put thermostat right.Top house back to engine should be bleeder,If not open cap COLD start car let run until warm,

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Okay, it may be due to overheating, that may be the noise you heard, lets hope. first allow engine to cool, open radiator cap or the resivoir cap, which ever is the fill, remove the bleeder at top hose and fill radiator slowly until coolant comes out bleeder.

note if water pump was replaced due to leaking and engine was overheated at that time then it may be a good idea to replace the thermostat .
after filling is done start engine and allow it to run. watch temperature if temp start to climb past half way shut engine down and let sit for 5min. then restart and check level, in res do not open cap . feel air from fan and see if it is getting hot, this may take up to a half hour but do not drive,

A few questions, does this jeep have an electric fan?
when you heard the knocking was engine temp hot?
If you start jeep cold does engine knock?
Did this jeep get a new thermostat with waterpump job?
did it overheat when pump went bad and why did water pump get replaced?

sorry for all the questions ,just trying to get all the info to help you .

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I replaced the thermostat becase the car was over heating and now the car is not overheating but i have no heat. what doe sthe bleeder vale do? do i need to do something with the bleeder valve after...


The bleeder is because the radiator is lower than the engine,have to crack the bleeder to let the trapped air out ,should see antifreeze come out ,not air.

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If it is a 4.1 alloy head crossflow then you may have an air blockage in your cooling system and the only way to check this is to undo the bleeder valve on the thermostat housing, start the engine with radiator cap off and once engine is at running temp it should have a steady stream of coolant (no air) coming out through bleeder but if it's intermittent with air and coolant at the same time then you have air in cooling system. To correct this fill radiator with engine still running and what bleeder till there is no more air and just coolant, close bleeder replace radiator cap and problem should be solved if not replace thermostat and follow the above instructions.

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Overheating


I would recommend that you bleed all air out of the cooling system. The bleeder valve is located on top of the engine. Once engine starts to overheat or when you can hear bubbling back into the overflow bottle, turn car off and open bleeder valve. If you see bubbling you have air in your system. Bleed the system a couple of times and see if this helps.A heat sensor sending unit which controls activation of the electric fan could also have failed.But is the heat sensor is properly working then check the radiator cap is it properly fitted or got loose.If its loose it will release the pressure and car will overheat.But if the radiator cap is properly closed.Then its time to check the HEAD GASKET.As you have mostly replaced all the possible faults for overheating and if other mentioned possibilities are checked OK.Then its time to check and replace head gasket. Thanks. you can rate this solution and show your appreciation.

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1 Answer

I need to locate the bleeder valve for a '96 pontiac sunfire, it appears to have air in the cooling system which is causing it to overheat.


Did you replace the thermostat? If not replace it. Is the cooling fan running? If not check the fuse & thermal relay. If it has a bleeder valve it will be located on the highest part of the cooling system. It may not have one. With the engine cold remove the radiator cap. Make sure the radiator is full. Set the heater control to Hot. Start the engine and watch for escaping air bubbles. Keep the radiator full until you see no more air escaping. If it continues to overheat repeat the process.

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Did you replace the fan? How about the fan switch?

Here is some stuff to read about this system....please let me know what's up!


This switch is the primary controller of the operation of the radiator fan(s) used for cooling. When the coolant in the system reaches a pre-determined temperature, the fan switch closes and completes a circuit. The fans will be brought on. Generally, the switch communicates with the fan relay, although the later PGM-FI cars send the signal through one of the many solid-state controllers first. Do not assume that the switch is the only component in the radiator fan circuit which controls its operation. There are many other components whose failure may prevent the radiator fan from operating. If the fans are not working when the engine is very warm, check the fuses first.
On all vehicles except 1990-95 Accords and 1992-95 Preludes, the fan switch is located in the bottom of the radiator. On 1990-95 Accords (except V-6) and 1992-95 Preludes, the switch is located in the housing at the rear end of the coolant connecting pipe. This is the pipe running along the outside of the engine, just above the oil filter. The switch the only electrical component in the housing. On the Accord V-6, it threaded into the side of the coolant crossover pipe (not next to the bleed bolt) on the transaxle side of the engine.

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