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Cooling fans not turning on,except when a/c is on

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There should be two fans in your engine bay, one if for the AC and another for the radiator. To be sure that it is the fan, pull out the socket to the temp sensor at the lower radiator hose. The fan should turn on by then. If it does not check out the wiring or the fan may be bad.

Posted on Jun 22, 2009

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Does my 2002 Cadillac Seville SLS have a cooling fan switch, and, if so, where is it located?


Cooling fan switch ?????? Has a engine coolant temp. sensor , That inputs info to the PCM/ECM - engine computer ! The PCM / ECM interpits the voltage signal from software programmed into it as to what temp . of the coolant is . When the engine coolant temp. reaches
The PCM commands the low-speed fans ON under the following conditions:
• The engine coolant temperature exceeds approximately 106°C (223°F).
• The transmission fluid temperature exceeds 150°C (302°F).
• The A/C pressure reaches 199 psi (1372 kPa).
The cooling fans will switch from low to OFF when the coolant temperature drops below 102°C (216°F).
The PCM commands the high-speed fans ON under the following conditions:
• The engine coolant temperature reaches 112°C (234°F).
• The transmission fluid temperature is more than 151°C (304°F).
• The A/C pressure reaches 260 psi (1792 kPa).
• Certain DTCs are set.
The cooling fans will switch from high to low, except when DTCs are set, when the coolant temperature drops below 106°C (223°F).

The PCM turns on the cooling fans by energizing three different relay's .
Watch this video
Relay Driven Dual Cooling Fan Diagnostics

May 29, 2017 | Cadillac Seville Cars & Trucks

2 Answers

Cooling fans not working properly


And why do you think this is a problem, they do not run anymore than what is required to cool the engine, as it gets hotter the fans will run longer at a higher speed, but you will seldom see that except on very hot days.

May 15, 2014 | 2001 Pontiac Aztek

1 Answer

Cooling fans always on in any heat setting


You are right,seems like it must be the control switch to me

Nov 17, 2013 | 1999 Ford Taurus

1 Answer

Radiator cooling fan will not turn on unless you turn on the air conditioner


Does the engine overheat? The fan is not designed to turn on until the engine reaches about 225F, so 90% of the time it does not run except on the hottest days..

Sep 11, 2012 | 1997 Ford Aspire

1 Answer

2003 subaru forester cooling fan not turning except when A/C is on


You need to check if the wires are properly connected.

Apr 13, 2012 | 2003 Subaru Forester

2 Answers

Radator fans will not come on 1996 neon


The older Dodge neon cooling system has always been a problem, so this will not be easy to diagnose and repair.

A little background. There is a temperature sensor in the coolant system that sends that information to the PCM and the PCM then sends a signal to your temperature gauge to register it. Once the temperature of the preset peak, the PCM then sends a signal to the cooling fans to turn on, so the do NOT run at all times when the engine is turning, only when the coolant level reaches a preset level (in the 200F to 235F range). The one exception to that is when the AC is turned on, the radiator fans should be told to turn on. So start the car, turn on your ac and see if the cooling fans turn on. If yes, you don't have a problem with the cooling fans. But that doesn't mean that you don't have a problem with your cooling system. If the car is overheating, you need to find out if the PCM is sending a signal to the cooling fans to turn on. If it isn't the trouble could be in the PCM.

Jun 06, 2011 | Plymouth Neon Cars & Trucks

1 Answer

My cooling fans will not come on with the ac on nor when the temp reaches as high as 235 degrees while driving..At first trhe fan would come on when i turned the ac on but when i tried to test the other...


On this vehicle there are 3 cooling fan relays and three fuses for the cooling fans.There are 2 in the under hood fuse panel and 1 in the instrument panel.You need to check the fuses and make sure they are all good.They get there input via the coolant temp sensor for the computer which in turn signals the cooling fan relays to turn on the fans.The other thing with the a/c clutch coming on and off.If the a/c system is low on freon this will cause the clutch to cycle more.If you can get a scan tool you need to monitor the coolant temp sensor to see if it is reading the same as the temp on the temp gauge.The other thing you an do is check for codes.Hope this helps and let me know what you come up with.

Sep 27, 2010 | 1996 Chevrolet Corvette

1 Answer

I'm trying to find out how many cooling fan relays are in a 1999 Ford Taurus SE with the 3.0L Vulcan OHV engine. This model year has done away with the CCRM (Constant Control Relay Module), so the relays...


fuse #9 protects the 2 cooling fan relays.

It looks like the hgh speed cooling fan realy is in a thin box mounted sideways between the battery and fender.

It has high speed relay, autolamp relay, autolamp headlamp relay, horn relay, washer motor relay, wiper hi/lo relay, wiper park relay.

Section 03-03: Engine Cooling 1999 Taurus, Sable Workshop Manual
DESCRIPTION AND OPERATION Electrical System NOTE: With A/C ON, the cooling fan motors will run continuously. Cooling fan motors will not cycle ON and OFF with A/C clutch (2884) .

NOTE: An exception to this is when vehicle speed is over 61 km/h (38 mph) and coolant temperature is below 100°C (212°F), and A/C head pressure is below 1.71 MPA (250 psi). The cooling fan motors will then automatically shut off.

The cooling fan motors are mounted within a fan shroud (8146) behind the radiator (8005) .

Engine Cooling Fan Control CCRM Applications The PCM monitors certain parameters (such as engine coolant temperature, vehicle speed, A/C on/off status, A/C pressure, etc) to determine engine cooling fan needs. The PCM controls the fan operation through the Fan Control (FC) output (single speed fan applications) or the Low Fan Control (LFC) and High Fan Control (HFC) outputs as shown in Table 2. Although the fan control (FC), low speed fan control and high speed fan control relays are normally open relays, the FC/LFC circuit is wired through a voltage inverter inside the CCRM. The voltage inverter ensures that the PCM must turn on (ground) the FC/LFC output to turn the fan off. This is done so the cooling fan will operate in the event of an open FC/LFC circuit.

Stand-Alone Fan Control Relay Applications The PCM monitors certain parameters (such as engine coolant temperature, vehicle speed, A/C on/off status, A/C pressure, etc) to determine engine cooling fan needs. The PCM determines engine cooling fan control requirements and controls the fan operation through the Low Fan Control (LFC) and High Fan Control (HFC) outputs (Table 3).

Jun 29, 2009 | 1999 Ford Taurus

1 Answer

Engine overheats and cooling fan cuts off


try to replace the hoses, they may be collapsing, then replace the thermostat, and give it a radiator flush to clear any possible clogs in the lines, last thing i would say is to replace the fan

Jun 24, 2009 | 1995 Ford Escort

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