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1999 Malibu Cooling fans don't come on. Country driving is fine. City driving and a few stop lights, and it over heats. Temp Gauge works fine. If I un plug the sensor then fans come on, but Tranny and Engine run rough Jake ontario
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first look to see if the cooling fan(s) come on when the temp gauge reads hot or above half way mark. I suspect the coolant temp sensor is faulty and not sending correct temp reading to pcm and is not turning on the cooling fans.. other possibility is the cooling fans are burnt or relay to fans also ..I would check fans first then relay info back here for more advise.
the temp gauge works of a different sender to the coolant sensor. IT has 1 wire only and changes resistance as the water heats up there by moving the needle on the gauge up the scale Check that the wire is tight on the sender unit and if so then replace the sender unit.. The difficulty in re starting the motor may be because it is over heating but you would not know this because of the faulty sender unit.
This is usually caused by air in the cooling system. While the engine is cool, check your fluid level in the coolant tank. Then check the radiator to make sure it is full. If both of them are full, the system has to be bled. To bleed the system, take the radiator cap off, start the engine. If there is air in the system it will bubble out and the fluid level will drop, add coolant until this stops.
turn ac off then the fan will go off make sure ac button if you have one isnt pushed inwait a minute fan should turn off does temp gauge inside car raise in temp after running a while
SOUND LIKE COOLANT FAN NOT COMING ON.WHEN YOU ARE IN CITY.YOUR ENGINE RADIATOR NOT GETTING MUCH AIR FLOW IN THE CITY.BECAUSE YOU STOP AND GO ALOT.DUE TO A LOT OF STOP LIGHTS.CHECK COOLANT FAN RELAY AND FUSE.IF BOTH GOOD.COOLANT TEMPERATURE SENSOR SENSOR.IF ALL IS GOOD HOT WIRE COOLANT FAN TO SEE IF IT RUNS.IF NO FAN MOTOR BAD.IF YES FAN MOTOR RUNS WIRE CONNECTOR IS OPEN OR DAMAGED.
Sounds like you have a faulty head gasket or maybe a cracked head.This can cause overheating and the check engine light to come on.The code for the o2 sensor is probably caused by coolant getting into the exhaust system and coating the sensor.The coolant fan may work but it cannot remove enough heat from the rad to make the engine cool off.Try some engine coolant stop leak to see if it will help.This maybe only a temperary fix.Let me know if you need more.MOE
country driving at high speeds keep engine air cooled. but in city there is not much air to cool the engine. check the sensor for the fans. relay for fans must be ok, cause you said if you disconnect sensor then fans run. replace fan sensor. also make sure there is a proper amount of coolant in system. (do this first).
Check your electric cooling fan is cutting in when stationary. Air flowing through your radiator whilst driving keeps your engine cool. There is no airflow when stationary, so cooling fan is used to compensate, sounds like yours isnt working.
I had a similar problem with a 2001 Saturn. We checked every fuse and they were all fine. We finally did a 'reset' on the car's computer by disconnecting the battery and reconnecting it a few minutes later. Everything was back to normal after that.
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