Question about 2000 Jeep Grand Cherokee

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Where is relay to coolant fan - 2000 Jeep Grand Cherokee

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Behind and under the right front headlight. You cant see it, its under the plastic panel. You may/will need to cut a hole and replace the relay, the hole you make can help it cool.

Posted on Dec 10, 2009

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Posted on Jan 02, 2017

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When i start my 2008 Cadillac sts i get a notification that engine hot A./C off. Even though it is the first time i stated it today


ENGINE HOT - AC OFF
Cooling System Description and Operation

you must have a cooling system problem of some sort !

Do the cooling fans come on when A/C is switched on ? Fan's should come on ! Does your vehicle have two or three cooling fan's ?
Cooling Fan Control - Two Fan System
The engine cooling fan system consists of 2 puller type electrical cooling fans and 3 fan relays. The relays are arranged in a series parallel (S/P) configuration that allows the engine control module (ECM) to operate both fans together at low or high speeds. The cooling fans and fan relays receive battery positive voltage from the underhood fuse block. The ground path is provided at G104.
During low speed operation, the ECM supplies the ground path for the low speed fan relay through the low speed cooling fan relay control circuit. This energizes the low speed fan relay coil, closes the relay contacts, and supplies battery positive voltage from the low fan fuse through the cooling fan motor supply voltage circuit to the left cooling fan. The ground path for the left cooling fan is through the cooling fan S/P relay and the right cooling fan. The result is a series circuit with both fans running at low speed.
During high speed operation the ECM supplies the ground path for the low speed fan relay through the low speed cooling fan relay control circuit. After a 3 second delay, the ECM supplies a ground path for the high speed fan relay and the cooling fan S/P relay through the high speed cooling fan relay control circuit. This energizes the cooling fan S/P relay coil, closes the relay contacts, and provides a ground path for the left cooling fan. At the same time, the high speed fan relay coil is energized closing the relay contacts, and provides battery positive voltage from the high fan fuse on the cooling fan motor supply voltage circuit, to the right cooling fan. During high speed fan operation, both engine cooling fans have their own ground path. The result is a parallel circuit with both fans running at high speed.
The ECM commands the low speed cooling fans ON under the following conditions:
• Engine coolant temperature exceeds approximately 94.5°C (202°F).
• A/C refrigerant pressure exceeds 1447 kPa (210 psi).
• After the vehicle is shut OFF, if the engine coolant temperature at key-off is greater than 101°C (214°F), the low speed fans will run for a minimum of 60 seconds. After 60 seconds, if the coolant temperature drops below 101°C (214°F), the fans will shut OFF. The fans will automatically shut OFF after 3 minutes, regardless of coolant temperature.
The ECM commands the high speed fans ON under the following conditions:
• Engine coolant temperature exceeds approximately 104.25°C (220°F).
• A/C refrigerant pressure exceeds approximately 1824 kPa (265 psi).
• When certain DTCs set
At idle and very low vehicle speeds the cooling fans are only allowed to increase in speed, if required. This ensures idle stability by preventing the fans from cycling between high and low speed.
Cooling

Having a qualified professional technician check it out would be your best bet ! Hooking up a factory or professional type scanner an check data input's an DTC'S - diagnostic trouble codes .

Diagnostic Starting Point - Engine Cooling
Begin the system diagnosis with the diagnostic system check. Refer to Diagnostic System Check - Vehicle . The Diagnostic System Check - Vehicle will provide the following information:
• The identification of the control modules which command the system
• The ability of the control modules to communicate through the serial data circuits
• The identification of any stored DTCs and their status
The use of the Diagnostic System Check - Vehicle will identify the correct procedure for diagnosing the system and where the procedure is located.

DTC P0480: Cooling Fan Relay 1 Control Circuit
DTC P0481: Cooling Fan Relay 2 Control Circuit
DTC P0480: Cooling Fan Relay 1 Control Circuit
DTC P0481: Cooling Fan Relay 2 Control Circuit
DTC P0691: Cooling Fan Relay 1 Control Circuit Low Voltage
DTC P0692: Cooling Fan Relay 1 Control Circuit High Voltage
DTC P0693: Cooling Fan Relay 2 Control Circuit Low Voltage
DTC P0694: Cooling Fan Relay 2 Control Circuit High Voltage
DTC P1258: Engine Coolant Overtemperature - Protection Mode Active
DTC P2600: Auxiliary Coolant Pump Relay Control Circuit
DTC P2601: Auxiliary Coolant Pump Performance
DTC P2602: Auxiliary Coolant Pump Relay Control Circuit Low Voltage
DTC P2603: Auxiliary Coolant Pump Relay Control Circuit High Voltage

Dec 10, 2017 | Cadillac Cars & Trucks

1 Answer

Need to find location of coolant fan relay and sensor for 1990 pontiac sunbird ?


if your rad coolant fan is not working check the fan itself as this is a common problem on these cars. disconnect the plug from the fan motor and run jumper wires directly from battery to the fan motor terminals. if the fan doesn`t run replace fan motor. if it does run the check fuses then fan relay. the relay is in the relay box, the coolant sensor for the fan motor is in the head that goes into a coolant passage that has a 2 wire connector.

Aug 31, 2014 | Cars & Trucks

1 Answer

84 pontiac fiero 2.5l previous owner cut the factory wire harness and wired in a single pole relay. Now the two speed fan only runs when the engine gets to temp. need diagrams or someone to explain how to...


what you have to know is the ECM in those year start the injection . Coolant fan work by a relay and the relay is control by ECM a ground to relay. Find out the wire for A/C to relay.then find a + wire for current to relay then power from relay to coolant fan.if you want two speed to coolant fan you need at least 3 wires at coolant fan motor.

Sep 16, 2013 | Pontiac Cars & Trucks

2 Answers

Fan not working...my car is overheating


The fuses are located in the fuse box under the hood, but could be the fan motor too, check if you have power at the motor

Mar 28, 2013 | 2004 Pontiac Grand Prix

1 Answer

Fan sensor is not working.


You need to change the relay and the temp sensor switch. If you have done that the reason it's not coming on is probably because the coolant is not getting hot enough to cause it to come on. Let me explain. The coolant fan when the A/C is off is activated by the coolant fan switch. The switch closes when coolant temperature is over 238F completing a path to ground through the coolant fan relay windings. The relay contacts then close and voltage is applied to the coolant fan. When the coolant temperature drops to 214F, the switch opens and the coolant fan stops. In A/C equipped vehicles, the A/C control head completes a path to ground for the coolant fan relay whenever the A/C is on no matter what the temperature. Voltage is then applied to the coolant fan. Essentially, the coolant fan switch is by-passed when the A/C is on, which is why the fan works whenever you turn the A/C on. Now, if the fan does not kick in when the coolant temperature is over 238F but works when the A/C is on, the problem has to be the coolant fan switch or the connectors or wiring to the CFS.

Jul 03, 2012 | 1998 Chevrolet Cavalier

1 Answer

Engine fan won't come on


IF COOLANT FAN FUSE AND RELAY OKAY.HOT WIRE COOLANT FAN TO SEE IF FAN MOTOR OKAY.IF FAN MOTOR OKAY.THE ENGINE COOLANT TEMPERATURE SENSOR MORE LIKELY BAD.THE ENGINE COOLANT SENSOR WHEN ENGINE COOLANT GETS HOT IT CAUSES ENGINE COOLANT TEMPERATURE RESISTANCE TO DECREASE CAUSE COMPLETE CIRCUIT IN WHICH POWER FROM PCM TO ECT SENSOR WILL SENT POWER TO COOLANT FAN RELAY THEN CAUSE COOLANT FAN TO TURN ON. HAVE ECT SENSOR OR ENGINE COOLANT TEMPERATURE SENSOR CHECK USING CODE SCANNER TO MAKE SURE ITS WORKING BEFORE SPENDING EXCESS MONEY.

Jun 18, 2011 | 1998 Ford Taurus

1 Answer

Car over heating thurmastat is workong


IF CAR OVERHEATING AT STANDSTILL OR IDLING IN A LONG TRAFFIC LINE.COOLANT FAN NOT TURNING ON.MORE LIKELY COOLANT TEMPERATURE SENSOR NOT WORKING.USE A SCANNER TO CHECK COOLANT TEMPERATURE WHEN ENGINE HOT.IF TEMPERATURE READ LOW COOLANT TEMP.SENSOR BAD.IF SENSOR OKAY.CHECK COOLANT FAN FUSE AND RELAY.ALSO HOTWIRE FAN TO SEE IF FAN MOTOR WORKING.IF NO REPLACE FAN MOTOR.IF FAN MOTOR GOOD FUSE AND RELAY COOLANT FAN MOTOR WIRE CONNECTOR IS DAMAGED OR HAS BROKEN WIRE.

Sep 14, 2010 | 1996 Oldsmobile Aurora

2 Answers

Fan


You have to check the main relay fan fuse relay and disconnect the fan and try it directly to make sure the fan motor is fine if all this is well into the cavity where the thermostat is a thermal switch that sends it relay the signal to the fan you can disconnect and the fan has to start working if this works the problem is you have the thermal switch. Thanks

May 10, 2010 | 1998 Toyota Camry

2 Answers

Coolant leaking replace every three days coolant fan wont stop ru


This link has a diagram showing the location of the relay: http://autorepair.about.com/library/faqs/bl581g.htm

The Pulse Width Modulated (PWM) radiator cooling fan relay is located behind the front bumper fascia below the right head lamp.

Sep 08, 2009 | 2000 Jeep Grand Cherokee

2 Answers

Cooling Fan Relay


The relay console center is located behind the glove box.

Jul 04, 2009 | 1991 Buick Park Avenue

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