Question about 2007 Volkswagen Jetta 2.5 Sedan

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Code P2185 2005 VW Jetta 2.5 5cyl

Same. Engind coolant sensor 2 high Voltage change sensor and radiator fluid no dice. Fans work properly wiring looks good next step for me is the thermostat.

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  • Anonymous Mar 13, 2014

    my coolant fans will not kick on. I have change sensors and checked fuses so i want to "hot" wire it with a toggle switch

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  • Volkswagen Expert
  • 257 Answers

There are two coolant temp sensors. One by the oil filler tube and one near the bottom radiator hose near the radiator.
When you flushed the coolant did you replace with VW rated G12 coloant? Very Important! - You can't use over the counter coolant - it'll cause sludge in your system. You have to use G12...

Hope this helps!
Please rate/vote! Thanx!

Posted on Jul 18, 2009

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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
--

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 .

Nov 13, 2016 | 1999 Pontiac Grand Am GT

1 Answer

2000 Nissan Maxima Overheating


sounds like the water temp sensor is not working you could hot wire the fan by unpluging it and runnig ahot wire and ground to it

Sep 19, 2012 | 2000 Nissan Maxima

3 Answers

I have an 89 camaro the cooling fan will not work unless you unplug the temperature sensor or hotwire it. I have replaced the temp. sensor and fan relay. I have tested wires to sensor from the sensor to...


Hi

Unplug the coolant temperature sensor while the engine is running. This should cause the fans to turn on low then kick to high, IIRC.
Typically when the engine computer loses the signal from the coolant temp sensor, it just turns both fans on high so the engine will not overheat. Ultimately, the fan is controlled by the computer. When it receives a signal from the temp sensor that reads the appropriate temp, it turns the fan on. One easy option is to wire a switch to the cooling fan relay. Then you can turn it on and off when you need it. I would not recommend running the fan constantly. You will burn out the fan motor and you'll never get up to normal temp for your sensors.

Check for coolant level and bad motor.

However as far as the fans and "disconnecting them from the temp sensor"..... The fans DO NOT connect directly to the temp sensor. They connect to the PCM (computer). The PCM reads the coolant temp sensor, and determines when to turn on the fans. It also uses the coolant temperature to control several other functions, including the transition from "open loop" A/F ratio control to "closed loop" A/F ratio control. It uses the temp to set the idle speed on cold start. It uses the temp to determine the cold start fuel enrichment. If you run this way, your car will be hard to start, it will run excessively rich, wasting fuel, and possibly even damaging the engine by diluting the oil.

Please get back to us if you have further query or else please accept this "particular" solution.

Sep 18, 2011 | 1989 Chevrolet Camaro

1 Answer

Radiator fans not working car is running hot.


Turn vehicle off. Allow to cool. Raise hood.
Try to see if the fans spin freely by hand. If not, replace. If they do spin, proceed to next step.
Next step-
Check coolant level, add if needed. Remember-radiator must be cool before opening cap. Make sure radiator cap is secure and tight if coolant was added.
Start vehicle. Observe coolant gauge as vehicle warms. Fans should come on when temp gauge reads halfway between c and h.
If fans do not come on see if they come on when you turn on ac or heat. If doing this makes them come on, suspect faulty cooling fan sensor switch. If they don't come on replace cooling fan sensor switch and fan relay.

Aug 30, 2011 | 1989 Nissan Maxima

2 Answers

3.1 coolent fans will not come on replaced thermostat and temp sensor fans still want come on is there another temp sensor on the radiator which side


No,it sounds like you have taken the correct steps here.these 3.1 engines run a little hot, the fans will not come on until the temp reachs over three quater the way on the gauge, they are also prone to a bad temp sender, this is located on the rear head near the trany, but if its overheating and you have bleed the system then theres a problem, when i say overheating i mean the gauge goes to hot and coolant boils over and out the resivior, if this is the case then the next thing would be to have a block test done, these engine are also known for headgasket problems, this is when exhaust enters the cooling system and stops the flow causing it to overheat, a quick test to see if the fans are operating correctly and the relay also is to start the engine and then disconnect the coolant temp sensor and fans should run, if the fans turn on then have the test done, this test is done by draining coolant down a little then theres a tube that holds the fluid that sits on radiator where the cap is and if exhaust is entering then the fluid will turn yellow and this means a head or gasket problem.good day.

Apr 10, 2011 | 1995 Chevrolet Lumina

2 Answers

I had my water pump go a while ago on my 2000 Intrigue, since then I've had to add coolant. My wife just took it out and drove approx. 10 miles and now it's pumping coolant out the over-flow and is...


Step by step:
Make sure the system has been bled if it has a bleed valve, run the vehicle till it gets hot, shut the vehicle off and open the bleed valve, only if it has one, and wait for straight fluid to come out, once fluid comes out close bleed valve make sure it is full of coolant and restart vehicle. If the vehicle does not have a bleed valve skip this step.
1. Check thermostat, since it is a cheap fix should probably just replace it if not already done so.
2. Check to make sure fans are working properly, a simple way is to turn on the A/C and visually look to see if the fans come on, if one fan is not on suspect wiring or bad fan most likely a fan motor. If both are on, then that only leaves the temp sensor that controls the fans. When the engine gets up to about 200 then the fan should turn on if not suspect temp sensor.
3. If those work fine suspect possible leak somewhere pressure test system, and check for leaks. Pressure test the Coolant cap as well. if fails replace cap.
4. If no leaks then do a block test, you can pick one of these up from autozone (rent it) but you will need to buy the fluid. This is to check for cracked head block or bad head gasket. The tester checks for exhaust gases in the coolant that could cause overheating. If test shows exhaust gases replace head gaskets.
5. Lastly if all checks good then pick up a infrared thermometer and check the temperature in various parts of the radiator if temperatures vary drastically suspect partially plugged radiator. Replace radiator.

Oct 10, 2010 | 2000 Oldsmobile Intrigue

2 Answers

Overheating


The first thing to check would be the coolant level, do this when engine is cool, if its full of coolant then my next step would be to make sure the fans are turning on, the most common thing would be a thermostant, you may want to start there and then see if it still overheats, if it does then take alook at the electric fans, if they are not turning on you may have a bad sensor that controls the fans to turn on at a certain temp,that part would be the coolant temp sensor, but start with the thermostant and checking the coolant level.

Aug 29, 2010 | 1999 Mazda 626

3 Answers

Why does my car keep overheating. I changred the thermostat and that wasn't the problem. The car isn't leaking. So can you tell me what the problem is?


Since you say you changed the thermostat, and that wasn't it then possibly the cooling fan is not functioning properly. Or bad water pump,inaccurate temperature gauge, radiator core blocked or restricted. These are just the most common reasons. Good Luck and I hope this helps a little

Aug 19, 2010 | 2002 Lincoln LS

2 Answers

2002 olsmobile alero w/ 3.4 litre engine overheating


your fans need replacing try hooking them up straight to battery to check if they spin fast its not the fans but the wiring.

Jan 11, 2009 | 1999 Oldsmobile Alero

3 Answers

Van chevrolet venture 2000


Fifteen minutes! you have bigger problems than only the fans the fans are controlled by a thermo switch that is heated by the coolant, If you have no coolant the sensor cannot activate But fifteen minutes seems like you may have a headgasket problem and steam cannot heat the coolant sensor.OperationNotesThe electric cooling fan operates when the engine cooling temperature exceeds a certain value. The cooling fan on this engine is controlled by the Powertrain Control Module (PCM) . The PCM turns the cooling fan ON by grounding the coil of the cooling fan relays 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 Maxifuses(R). The cooling fan relays are energized when current flows from the fuses in the Underhood Accessory Wiring Junction Block, and through the relay coils to ground through the PCM. The Coolant Fan 1 Relay Control Circuit is grounded for low speed fans operation. During low speed fans operation, both fans run at a slow speed. The Coolant Fan 1 Relay 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. Perform the A Powertrain On Board Diagnostic (OBD) System Check prior to diagnosing the engine cooling fans.

For more information regarding the Charging System, refer to Charging System Description , and Charging System Circuit Description in Starting and Charging.

If a problem that involves the low speed cooling fan relay control circuit exists, DTC P0480 Cooling Fan Relay 1 Control Circuit should set. If the problem affects the high speed cooling fan relay control circuit, DTC P0481 Cooling Fan Relay 2 Control Circuit should set. A problem with the ECT sensor should set DTC P0117 Engine Coolant Temperature (ECT) Sensor Circuit Low Voltage, DTC P0118 Engine Coolant Temperature (ECT) Sensor Circuit High Voltage, DTC P1114 Engine Coolant Temperature (ECT) Sensor Circuit Intermittent Low Voltage, DTC P1115 Engine Coolant Temperature (ECT) Sensor Circuit Intermittent High Voltage. Any of these DTCs will affect cooling fan operation and should be diagnosed before using the Electric Cooling Fan Diagnosis.

For more information regarding the Cooling System refer to Engine Cooling Fan Description - Electric, and Cooling System Description in Cooling System.


Here is the electrical schematic and how it all is suppose to work,
If you need any further help please contact me Thank you,Randy If you find this information helpful please give me a good rating

www.aceautomotive1.com

Aug 16, 2008 | 2000 Chevrolet Venture

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