Question about 1999 Ford Escort

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1999 Ford Escort SRS, 2.0L Single cam. Replaced cylinderhead due to crack by overheating, Cooling fan doesn't kick in.

Cool temp sensor replaced, Relay control module replaced. Cooling fan doesn't kick in at all at high temp and doesn't not kick in when AC is on. Fan works when disconnecting cool temp sensor plug from new sensor. What else could be the problem to the cooling fan?

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  • Ted Bierman
    Ted Bierman Dec 29, 2013

    If I'm not mistaken, the thermal fan switch would on the cooling fan itself, but the fan runs when connector is disconnected from the ECT when engine is hot.

  • Behind_Blue_Eyes
    Behind_Blue_Eyes Dec 29, 2013

    No, the coolant temp sensor is for the pcm, the thermal fan switch is for the fan relay... by disconnecting the coolant temp sensor you trick the pcm into over riding and turning on the fan

  • Behind_Blue_Eyes
    Behind_Blue_Eyes Dec 29, 2013

    Also, if I remember correctly you should have a cooling fan controller for the fan. Possibly next to the radiator or I've seen them behind the glove box. The little black box gets its signals from several different sources. PCM, TFS, Key on power, ac demand and thats about it. Searching for a thermal fan switch... But if it does not have one then I would suspect this cooling fan control module would be the problem... If it is, yo will need the number off of the old part to get the correct one... And yes, I have seen where Ford forgot one number which screwed everything up !!!

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  • Ford Master
  • 1,727 Answers

Have you bothered to check the thermal fan switch...

Posted on Dec 28, 2013

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Posted on Jan 02, 2017

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wyatt1582
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SOURCE: Cooling fans will not kick in.

The fans won't kick on then you need to replace the coolant temp sensor this runs your fans.

Posted on Apr 22, 2009

  • 94 Answers

SOURCE: cooling fan relay

its not an actual relay is like a relay assembly

Constant Control Relay Module (CCRM)


The Constant Control Relay Module is located at the LH front of the engine.

Posted on May 27, 2009

adnanbhatti
  • 1188 Answers

SOURCE: Replaced cooling fan ,cooling fan relay, and 40

Did you check the parts before replacement? Check if there is power supply to the fan when engine is hot and the fan should start. Also check the temperature sensor or the automatic fan switch located below the radiator, it may be faulty.

Posted on Sep 15, 2009

Testimonial: "Thanks so much!"

  • 449 Answers

SOURCE: I have a 91 Ford

check the relay

Posted on Sep 05, 2010

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My 07 Saturn Relay shows ac off for engine protection but the gauge shows cold. The hoses feel normal. What is happening?


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Refer to Cooling System Description and Operation

DTC P1258: Engine Coolant Overtemperature - Protection Mode Active.
This is something you need to take to a qualified repair shop .
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During low speed operation, the PCM/ECM supplies the ground path for the low speed fan relay through the low speed cooling fan relay control circuit. This energizes the cooling fan 1 relay coil, closes the relay contacts, and supplies battery positive voltage from the cool fan 1 maxifuse® 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 relay and the right cooling fan. The result is a series circuit with both fans running at low speed.
During high speed operation, the PCM/ECM supplies the ground path for the cooling fan 1 relay through the low speed cooling fan relay control circuit. After a 3 second delay, the PCM/ECM supplies a ground path for the cooling fan 2 relay and the cooling fan relay through the high speed cooling fan relay control circuit. This energizes the cooling fan relay coil, closes the relay contacts, and provides a ground path for the left cooling fan. At the same time the cooling fan 2 relay coil is energized closing the relay contacts and provides battery positive voltage from the cool fan 2 maxifuse® on the cooling fan motor supply voltage circuit to the right cooling fan. During high speed fan operation, both engine cooling fans have there own ground path. The result is a parallel circuit with both fans running at high speed.

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Need a wiring diagram of the 2 wires from the temp sending unit that controls the temp gauge and cooling fans on a 99 grand am gt. Need to see where they go They disappear behind the engine


The PCM regulates voltage to the coolant fan relays, which operate the fans. Refer to Engine Controls.

Engine Cooling Fan Description - Electric
The electric cooling fans are used to lower the temperature of the engine coolant flowing through the radiator. They are also used to cool the refrigerant (R-134a) flowing through the A/C condenser.
Operation
The electric cooling fan operates when the engine cooling temperature exceeds a certain value. The cooling fan on this engine is controlled by the PCM. The cooling fan has one speed. The PCM turns the cooling fan ON by grounding the coil of the cooling fan relay when certain conditions are met. When the A/C is requested, the cooling fan will also be turned ON.
Power for the cooling fan motors are supplied through Cool Fan #1 and Cool Fan #2 relays. The cooling fan relays are energized when current flows from the fuses in the Cell 23: Cooling Fan Controls , and through the relay coils to ground through the PCM. The Low Speed fans control circuit is grounded for low speed fans operation. During low speed fans operation, both fans run at a slow speed. The High Speed fans control circuit is grounded for high speed operation. During high speed fans operation, both fans run at high speed.
Important: When certain Diagnostic Trouble Codes (DTCs) are present, the PCM may command the cooling fans to run all the time. It is important to perform Powertrain On Board Diagnostic (OBD) System Check prior to diagnosing the engine cooling fans.
If a problem that involves the low speed cooling fan relay control circuit exists, DTC P0480 should set. If the problem affects the high speed cooling fan relay control circuit, DTC P0481 should set. A problem with the ECT sensor should set DTC P0117, P0118, P1114, or P1115. Any of these DTCs will affect cooling fan operation and should be diagnosed before using the Cooling Fan Diagnosis tables. The Cooling Fan Diagnosis tables should be used to diagnose the PCM controlled cooling fans only, if a DTC has not set.

The engine coolant temperature (ECT) sensor (3) is a thermistor, a resistor which changes value based on temperature, mounted in the engine coolant stream. Low coolant temperature produces a high resistance (100,000 ohms at -40°C) (-40°F), while high temperature causes low resistance (70 ohms at 130°C) (266°F).
The PCM supplies a 5 volt signal to the ECT sensor through a resistor in the PCM and monitors the terminal voltage. Since this forms a series circuit to ground through the ECT sensor, high sensor resistance (low temperature) will result in high PCM terminal voltage. When the resistance of the ECT sensor is low (high temperature), the terminal voltage will be drawn lower. This terminal voltage indicates engine coolant temperature to the PCM.
A hard fault in the ECT sensor circuit should set either a DTC P0117 or P0118. Remember, these DTCs indicate a malfunction in the engine coolant temperature circuit, so proper use of the DTC table may lead to either repairing a wiring problem or replacing the sensor, to properly repair a problem.

The engine coolant sensor is an input to the PCM , Two wire's both go to the PCM .An the PCM turns on the cooling fans !

DTC P0480 Cooling Fan Relay 1 Control Circuit
DTC P0481Cooling Fan Relay 2 Control Circuit
The Body Control Module (BCM) request the cooling fans. The BCM sends a Class 2 message to the PCM in order to enable the fans based on various inputs. Thebattery voltage travels to all three cooling fan relay coils. The PCM enables cooling fan relay #1 by providing the ground path. The PCM enables cooling fan relays #2 and mode control together by providing a ground path. The left and right cooling fans are connected in series. This will enable both fans on low speed when the fan #1 relay is energized. When all three fan relays are energized, both fans will operate at high speed. The high speed is possible because the fan relays are wired in a parallel circuit. When the PCM detects that certain DTCs are set, the PCM will enable the cooling fans.
The PCM will enable the engine cooling fans when certain Diagnostic Trouble Codes are set.

Important: A short to ground will cause an open fuse(s). Before performing this diagnostic procedure, inspect the fuse(s) for an open.
1
Did you perform the Instrument Cluster System Check?
--
Go to Step 2
Go to Instrument Cluster System Check
2
Turn the ignition switch to the ON position.
With the scan tool select Instrument Panel Cluster, Special Functions, Instrument Panel Cluster (IPC) gauges.
Perform the Coolant Gauge Sweep Test.
Does the coolant temperature gauge complete a full sweep when commanded?
--
Go to Powertrain On Board Diagnostic (OBD) System Check in Engine Controls
Go to Step 3
3
Replace the instrument cluster. Refer to Instrument Cluster Replacement .
Did you complete the repair?
--
Go to Instrument Cluster System Check
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Your best bet would be to take your vehicle to a qualified repair shop that knows how the system works . An has the tools to diagnose the problem .

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