Question about Jeep Cars & Trucks
2004 jeep grand Cherokee keeps coming up with code for coolant staying below temp too long, checked thermostat checked out ok but replaced it anyway, seems to be happening with ac on only, checked pressures in ac even evac and recharged to make sure proper amount was in the system so pressures were not p[laying games with the fan coming on, all checked fine, with ac on temp seems to stay below 170, live in fl temp has been in the mid to high 70s lately , any ideas????? once the ac is shut down the engine temp goes to 210 like it should then comes back down normally..confused need input thanks
Have you not googled your obd codes
& diagnosed them, to find a problem
No idea why you would do all you did
You always resolve code related issues first
The coolant temp should be 210 all the time
Sounds like your not looking at scan tool data
or following any factory trouble charts or actually
know what coolant temp is,your just assuming & not
doing the required testing to verify things
Posted on Nov 22, 2014
Testimonial: "actually taking temp readings live from scanner so yes I sure am again only happens with condenser fan running as it does, when ac is first started, it comes on like it should but temperature drops and stays around 160 170 without ac running it goes to 210 with no issues, so don't be so rude and stop judging people when you have no idea who is on the other end."
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Posted on Jan 02, 2017
SOURCE: engine overheat
Hi and welcome to FixYa,
Offhand it would appear that the radiator fan is not working. In some versions, either the A/C or the heater must be turned on for the radiator fan to work. In some other incidents, the fan utilizes a clutch. Common design makes use of the inverse property of silica oil to serve as the clutch. Still others have a relay that actually does the switching on of the fan. Of course it would be to your advantage to likewise check the temperature sensor on the radiator.
Good luck and Thank you for using FixYa. Happy Holidays.
Posted on Dec 07, 2008
U should have the accuracy of the gauge tested before u spend any more money on this, factory gauges are not very accurate. U are still in the normal zone though no matter what the other expert says, and jeep Cherokee's run hotter than 195 due to how small the engine bay is, my friend and fellow tech works for a jeep dealer and says hot running on V6's and overheating esp on the V8's is a common issue even on new trucks.
Posted on Mar 13, 2009
P0505 means the whole Idle Control system, not only the IAM. Check all related sensors (i.e. crankshaft sensor). Check with a voltmeter direct at the connector of the IAM if you get any signal. Remove the IAM from the TB, connect him, let someone switch your ignition key to ON. The IAM need to drive in/out for a short time to find the right position. Hold the IAM near a hard part, that they cant drive out completely! If IAM works fine, check the fuel pressure, check and clean your TB ( if not done yet). If that doesn't work, come back again please
Posted on Oct 27, 2009
SOURCE: the check enging light comes
According to Autozone.com: Cooling Fan Switch Engine Temperature Sensor Temperature Switch Fig. Remove the coolant temperature sensor Fig. The electrical connector for the combined temperature sensors is keyed to avoid improperly connecting the sensor's wiring-1997 2.8L V6 connector shown
Because ECT (engine coolant temperature) sensor procedures vary depending upon their location, first locate the part. You may need to partially drain the engine coolant to prevent coolant spillage.
Coolant Temperature Sensor
The coolant temperature gauge sensor is a temperature-variable resistor, or thermistor. As coolant temperature increases, the resistance of the sensor decreases or decreases, depending on the type of sensor.
A1 and A2 platforms use a different type of circuit that A3 vehicles. On A1 and A2 vehicles, the circuit is a "resistance to ground" type. A3 vehicles use a "variable voltage" type, where a voltage is supplied to the sensor. Because of the circuitry design on A3 vehicles, testing of the coolant temperature gauge is limited.
The engine coolant temperature gauge uses a heat sensitive sending unit to transmit an electrical signal to the gauge. The sending unit is a heat sensitive variable resistor that is located on or near to the cylinder head and threads into an engine coolant passage. The sensors are a Negative Temperature Coefficient (NTC) type. As the temperature increases, the electrical resistance of the sensor decreases. As the coolant temperature changes, so does the resistance of the sensor. The gauge is calibrated within the operating range of the sensor and interprets the resistance value to display the coolant temperature.
Beginning with model year 1994, the engine coolant gauge and the Engine Control Module (ECM) temperature sensors were combined into one sensor with 4 terminals. The basic operation remains the same in that their resistance decreases as the coolant temperature increases, however the actual resistance values of the 2 sensor circuits are different. The electrical connector of the 4-wire terminal sensor ( 1 and 2 ) is keyed to prevent improper connection of the sensor's electrical circuit.
Cooling Fan Switch
Engine Temperature Sensor
Fig. Remove the coolant temperature sensor
Fig. The electrical connector for the combined temperature sensors is keyed to avoid improperly connecting the sensor's wiring-1997 2.8L V6 connector shown
Posted on Oct 17, 2010
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