Question about 1990 Chevrolet Beretta

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The engine is overheating and the fan doesn't appear to be operating but turns freely by hand. Is there a test point or sensor location?

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Check fuses and relay than check fans with ohm meter for possible short or disconnect at fan carefully use a 12 volt jumper to feed power to fan motors if work than check sensor in cooling system for failure

Posted on Oct 05, 2009

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  • Master
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This is the easiest way to test. Unplug the fan and direct wire to the battery and see if it comes on. If the fan comes on it is good, go to the relay center and make sure the relay is good. There should be another relay right next to it that is identical to it swap the two out and see if it comes on then when it gets hot. If it does and the item in which you swapped the relay from does not work then relay is bad replace it. Also check the cooling temperature sensor mounted near the thermostat housing if this goes out the fan will not kick on.

Posted on Oct 05, 2009

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CAUTION : Be careful when working around a running engine. Keep hands and loose clothing away from moving engine parts and engine cooling fan.

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Crownvictorias2006 overheating all the time


Do you think that it's overheating because the temperature light is on? If so, then it's possible that you have a bad temperature sensor and not an overheating engine.
Look for other signs of engine overheating :
1. Sluggish engine operation.
2. Detonation upon acceleration (pinging).
3. Rough, uneven engine idle.
4. Coolant boiling in overflow tank.
If your vehicle is experiencing these symptoms, then overheating is indicated. One of the most common cases of overheating is a bad thermostat. Another common problem is a faulty cooling fan or fan circuit. The cooling fan can be checked by running the engine at operating temperature and turning on the AC control. if the fan does not come on, then a problem with the fan circuit is indicated. The thermostat can be checked by placing a cooking thermometer on the motor near the upper radiator hose where it attaches to the motor. the temperature should not go above 225deg. If it does, then replace the thermostat. If the temperature stays at or below this rating, then replace the temperature sensor. I hope that this information helps you with your problem and thank you for using Fixya.com.

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How did you determine that the sensor failed. Did the check engine light come on? When you say that the fan won't turn, do you mean that it won't turn on and run or that you can't physically turn it by hand. To determine this, disconnect the electrical connector to the fan and try to turn it by hand. It should turn easily. If it doesn't then it must be replaced. If it does then reconnect the electrical connector to the fan and try to operate it by disconnecting the temperature sensor lead and placing a jumper wire between the terminals of the harness. turn the AC control to AC/MAX and turn the ignition key to on. If the fan runs then the problem is the sensor. If it doesn't then check the fan control relay and any related fuses. WARNING : Use extreme caution when testing the fan circuit. Never attempt to turn the fan with the electrical connector in place. The fan can operate at any time even if the engine is off.

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you need to have your car checked with a hand held computer,with this tool you can do special test like turn the cooling fans on, and with the tool you can see what temperature the computer sees,if your temperature sending unit is lying ,like if your engine is at 215 degrees and over heating, the temperature sending unit might only be telling the computer it's at 190 degrees,which the computer will not turn the fans on.and with a hand held tool you can check the fan relay which turns the fan on.or the fan motor could just need replaced,so if you do special test and turn the fans on with this tool,you can do all your testing with a test light.

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IT COULD BE THE FAN FUSE OR FAN RELAY, IF THE FAN IS DRIVEN BY THE ENGINE TRY CHECKING THE FAN CLUTCH. IF THE FAN SPINS FREELY WHILE IT IS COOL, THEN WAIT FOR THE ENGINE TO HEAT UP AND SHUT THE ENGINE OFF AND TRY TURNING THE FAN BY HAND. IF THERE IS LITTLE OR NO RESISTANCE THEN REPLACE THE FAN CLUTCH. IF THE FAN IS ELECTRIC THEN REPLACE THE FUSE AND RELAY LOCATED UNDER THE HOOD IN THE FUSE PANEL. HOPE THIS HELPS. PLEASE KEEP ME POSTED. THANKS FOR AN HONEST RATING AND FOR USING FIX-YA. BEST OF LUCK.

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Hi, I put together a guide that will help you diagnose this issue. it will help you troubleshoot all problem areas and lead you to the problem at hand.


Step1
Check for broken wires or loose connectors around the fan circuit. Inspect connectors at the fan motor, relay, sensor or heat sensitive switch, and the Electronic Control Module (ECM)--your car’s computer control system. Also, make sure to check for a possible blown fan fuse. These are common and overlooked troublesome spots that may cause a fan to fail.
Step2
Run and bring the engine to warm temperature. With the engine running, use a voltage test light to check for power to the motor fan. Be extra careful and make sure to Keep your hands and tools away from the belt, fan or any other engine moving parts. If voltage is reaching the fan motor, the test light should glow.
Step3
Turn off the engine after you see the light glow. Apply direct voltage to the fan motor from your car battery using a pair of spare wires. If the fan fails to operate, replace the fan motor. If the motor operates, your problem is in the motor connector.
Step4
Locate the heat-sensitive switch or heating sensor if the fan motor operates with direct voltage and the test light did not glow. You should find the sensor in the radiator, engine block, or thermostat housing.
Step5
Measure the resistance across the heating sensor with the multimeter. With the engine at cool temperature (engine off), it should register infinite resistance; with the engine at warm temperature (engine off), you should read low resistance. If both readings state infinite resistance install a new heating sensor, that’s the cause of your failing fan.
Step6
Check the action of the fan relay if the heating sensor is registering variable resistance. Your service manual should specify the power and ground wires according to color codes and the proper way to test it. If the fan relay fails the test replace it with a new one.
Step7
Check the connections going to the ECM after you determine the fan relay is working properly. If you find broken wires or loose connectors, make the necessary repairs. If you suspect a defective ECM take your vehicle to a service shop for a computer analysis. In most cases, the ECM is rare to be the cause of a failing fan. The above steps should take you to the root cause of your problem and help you fix the cooler fan.



  • Most automotive service manuals will show the wiring diagrams for the different electrical and electronic system components. Having the service manual for your car handy to locate components and look up specifications will make your troubleshooting task much easier.
  • A service manual can be purchased at most auto part stores. Also, most public libraries maintain an updated section of automotive service manuals that you can consult free of charge.
  • Keep your hands away from the fan, belts, or any other moving parts while working on your engine, they can easily catch and rip through your fingers, hands and arms.
  • Always wear short sleeve shirts and avoid wearing jewelry or watches while working on your car engine, especially while the engine is running. Clothes and jewelry can get trapped in moving engine parts and cause severe injury.
Please rate and have a great day:)

Apr 28, 2009 | 1999 Chevrolet Corvette

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