Question about 1996 Honda Odyssey

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1996 Honda Odyessey engine cooling fans don't come on and engine on and engine temperature tends to go up. it will only come on when the AC is switched on. i do not need to run the AC all the time but i have to to keep the engine temperature down. please help to resolve this problem.

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Check all fuses first. if the fuses are okay, disconnect the engine cooling fan connector and using jumper wires, connect the fan motor directly to the battery and ground. If the fan still doesn't work, replace it. If the fan does work, its relay may be faulty. Check in the engine compartment fuse box for the cooling fan relays. Try switching the cooling fan relays and see if the engine fan comes on and the a/c condensor fan stops working. If so, the engine cooling fan relay is faulty. If the engine fan still doesn't come on with a good relay, then check the engine temperature switch located at the passenger end of the front cylinder head. It is supposed to switch (have continuity) when the engine temperature reaches 205 deg F. You can remove the switch and put it in a pot of close to boiling water (212 deg F). If it doesn't have continuity at that temperature, it is defective.

Posted on Mar 22, 2011

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Whenever I turned on the air condition in my Ford Explorer 2006, after few second the radiator Fan start running very frequently on high speed making noise. When the fan starts on high the rpm of the...


The cooling fan is supposed to come on when the /ac compressor clutch cycles on, and off when it cycles off.
The idle speed kicks up to compensate for the additional a/c compressor load and the additional alternator load. usually, just the low speed comes on until it hits a much higher temperature.

the system should cycle 4 to 7 times/minute at 79 degrees F.

Here are some things to consider:(The PCM (engine computer) is NEVER defective, don't replace it). I don't think it is the ECT (engine coolant temp sensor) or the Cylinder Head Temp Sensor. Or the VSS or the MAF sensors.


The electronically controlled fan clutch is controlled by the powertrain control module (PCM) based upon requests for airflow to cool the engine, transmission and A/C condenser. If no cooling is required, the electronics permit the fan to spin at a slower speed yielding improved fuel economy.
-------------------------------------------------------------------------------------------------------------------------------
Inoperative or damaged:
  • Electronically actuated fan clutch
  • Electronically actuated fan clutch controller
  • Wiring, connectors, relays or modules
  • Engine Coolant Temperature (ECT) sensor (4.0L SOHC)
  • Cylinder Head Temperature (CHT) sensor (4.6L [3V])
  • Mass Air Flow (MAF) sensor
  • Vehicle Speed Sensor (VSS)
  • ----------------------------------------------------------------------------
If the cause is not visually evident, connect the scan tool to the Data Link Connector (DLC).
Retrieve any DTC Codes (Diagnostic Test Code). Autozone will do for free.

--------------------------------------------------------------

The cooling fan clutch actuator valve controls the fluid flow from the reservoir into the working chamber. Once viscous fluid is in the working chamber, shearing of the fluid results in fan rotation.

The cooling fan clutch actuator valve is activated with a pulse width modulated (PWM) output signal from the powertrain control module (PCM). By opening and closing the fluid port valve, the PCM can control the cooling fan clutch speed. The cooling fan clutch speed is measured by a Hall-effect sensor and is monitored by the PCM during closed loop operation.

The PCM optimizes fan speed based on engine coolant temperature (ECT), engine oil temperature (EOT), transmission fluid temperature (TFT), intake air temperature (IAT), or air conditioning requirements. When an increased demand for fan speed is requested for vehicle cooling, the PCM monitors the fan speed through the Hall-effect sensor. If a fan speed increase is required, the PCM outputs the PWM signal to the fluid port, providing the required fan speed increase.

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