Why does my Pontiac cooling fan keep running?
If they are, the ECU is commanding them on falsely (bad temp sensor or it thinks the missing A/C compressor is “on”) or the relay may be stuck closed. Usually you can find another relay of the same type in your fuse box and switch them to see what happens.
How does the cooling system work on a Pontiac?
The PCM sends the signal to the BCM, which turns the fans on. Or you can buy a separate temperature fan relay system with a temp probe and bypass the system. It will work as normal cooling when needed only. Its the connecter that you unplug from the temp sensor.
How to repair a cooling fan in your car?
Cooling fan. How to repair a cooling fan in your car DIY with Scotty Kilmer. How to inspect and repair a cooling fan that’s not working. There’s many reasons why a cooling fan could stop working, such as a bad sensor, relay, fuse and more. DIY car repair with Scotty Kilmer, an auto mechanic for the last 42 years. 1.
What to do if your radiator cooling fan Wont Stop Running?
Remove the lid. Look on the inside of the lid and for the mapping of the fuses and relays with their location. Pull the cooling fan relay out of the box. Replace the cooling fan relay with a new one. A stuck closed relay is the only thing that can operate the cooling fan continuously with the key off.
Why are the cooling fans not working on my car?
1. Engine running hot 2. Cooling fans do not function 3. Cooling fans stay on at all times Average rating from 129,472 customers who received a Vehicle Engine Cooling Inspection. Most modern vehicles use electric cooling fans to help pull air through the radiator so that it can keep the engine cool.
What to do if your computer cooling fan won’t run?
Replace the cooling fan relay with a new one. A stuck closed relay is the only thing that can operate the cooling fan continuously with the key off. The computer looses power with the key off and the same applies to the coolant temperature sensor. The relay, however, has direct power to one side, the same as a light switch.
What are the symptoms of a bad cooling fan relay?
1. Engine running hot One of the first symptoms commonly associated with a bad or failing cooling fan relay is an engine that runs hot or overheats. If you notice that your engine is running at higher temperatures than normal, that may be a sign that the relay is not functioning properly.
How does the cooling fan relay work on a car?
The cooling fan relay is the relay that controls the engine’s cooling fans. When the correct parameters are met, a temperature switch or the computer will activate the relay, which will allow power to the fans. The relay will usually be activated once it is detected that the vehicle’s temperature…
If they are, the ECU is commanding them on falsely (bad temp sensor or it thinks the missing A/C compressor is “on”) or the relay may be stuck closed. Usually you can find another relay of the same type in your fuse box and switch them to see what happens.
The PCM sends the signal to the BCM, which turns the fans on. Or you can buy a separate temperature fan relay system with a temp probe and bypass the system. It will work as normal cooling when needed only. Its the connecter that you unplug from the temp sensor.
Why is my Pontiac Grand Am GT not cooling?
It leaks coolant into the cylinders and causes inefficiency in the cooling system, leading to low coolant and overheating. You can replace this gasket with a metal one, the repair is a little involved but I managed with a Haynes manual. Good luck! My 2000 Pontiac Grand Am GT (6 cy/3.4L) has been having cooling issues.
What to do if your car fan is not running?
Or you can buy a separate temperature fan relay system with a temp probe and bypass the system. It will work as normal cooling when needed only. Its the connecter that you unplug from the temp sensor. That connection is usually bad and can be fixed by directly putting the wires together or cleaning each connector.
How does the aux fan control work on a car?
Aux fan control is generally run by a relay, usually tied to whatever engages the compressor clutch (typically the AC switch on your dashboard). I would be willing to bet when the compressor was removed, someone jumpered out the cooling fan relay (s) so both fans run constantly.
How big of a cooling fan do I need for an 8 cylinder car?
A general guideline to follow for cooling a stock engine is 2,500 cfm for an 8-cylinder, 2,000 cfm for a 6-cylinder, and 1,250 cfm for a 4-cylinder. Of course, high-performance engines require more airflow. Many electric cooling fans are rated by recommended horsepower to help you choose the optimum cooling fan for your vehicle.
Is it normal for cooling fans to run all the time?
Even with the cooling fans running all of the time, the engine thermostat should force the engine to warm up at a normal speed. The thermostat will regulate the coolant to the radiator/fans if it is working properly. It can be normal for the cooling fans to run constantly under certain conditions.
Can a car fan still run after the engine is turned off?
Then you notice the engine cooling fan is still running even though the car is turned off. It is ok for the engine cooling fan to keep running for a few minutes after turning off the car. Your car fan will run for a few minutes after you turn off the car then turn off. This is normal in many vehicles, such as BMW or Mercedes-Benz.
Why does my car overheat when I Turn on the fan?
The cooling fan, which is behind the radiator grille, removes heat from the engine’s coolant. This fan is electrically controlled and relies on the signal from the onboard computer. If the fan receives a false signal, the fan might not turn on, causing the engine to overheat.
Is it normal for car cooling fans to run constantly?
It can be normal for the cooling fans to run constantly under certain conditions. If the car is hot enough, they may be barely keeping up with demand and stay on. Also, most cars will run the fans at a high speed if the A/C is turned on. However, when you first start up a stone cold car with the A/C off, they should not be running.
Aux fan control is generally run by a relay, usually tied to whatever engages the compressor clutch (typically the AC switch on your dashboard). I would be willing to bet when the compressor was removed, someone jumpered out the cooling fan relay (s) so both fans run constantly.
Why does my car run when the a / C is off?
Also, most cars will run the fans at a high speed if the A/C is turned on. However, when you first start up a stone cold car with the A/C off, they should not be running. If they are, the ECU is commanding them on falsely (bad temp sensor or it thinks the missing A/C compressor is “on”) or the relay may be stuck closed.
How are the cooling fans in a car?
Most modern cars with electric fans usually have 2 – one for regular cooling (typically switched by the ECU) and an auxiliary fan for AC. Aux fan control is generally run by a relay, usually tied to whatever engages the compressor clutch (typically the AC switch on your dashboard).
Even with the cooling fans running all of the time, the engine thermostat should force the engine to warm up at a normal speed. The thermostat will regulate the coolant to the radiator/fans if it is working properly. It can be normal for the cooling fans to run constantly under certain conditions.
Most modern cars with electric fans usually have 2 – one for regular cooling (typically switched by the ECU) and an auxiliary fan for AC. Aux fan control is generally run by a relay, usually tied to whatever engages the compressor clutch (typically the AC switch on your dashboard).
Why does my fan not kick on when my engines gets hot?
If they are good then with the vehicle running with a/c on (this way you don’t have to overheat the engine to test) test for voltage at the radiator fan. There should be 3 wires, one Yellow is voltage to low speed, Grey is voltage to high speed and black is found.
Why does the radiator fan not come on when the AC is on?
In order for the AC Condensor to do its job it must stay as cool as it can. As for the engine coolant temp sensor, if the coolant is not hot enough to make the fan come on, then there is no need for the fan yet and there is no problem.