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<!-- from fixya rte -->How do I add a second cooling fan - Computers & Internet

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Cold pads work very well and are very inxpensive

Posted on Nov 20, 2014

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Posted on Jan 02, 2017

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The location of a 2002 chevy cavalier cooling fan sensor


The cooling fan is controlled by the PCM - powertrain control module through a relay ! There is no cooling fan sensor , there is a coolant temperature sensor ! This coolant temperature sensor is an input to the engine computer , if there were a problem wit the sensor the check engine light would be on .
Cooling Fan Control
The engine cooling fan system consists of one cooling fan and one relay. The relay is powered by the battery positive voltage circuit and controlled by a switched ground from the powertrain control module (PCM).
During operation, the PCM supplies the ground path for the cooling fan relay through the cooling fan relay control circuit. This energizes the cooling fan relay coil, closes the relay contacts, and supplies battery positive voltage from the cooling fan fuse through the cooling fan motor supply voltage circuit to the cooling fan. The cooling fan motor is grounded through its own ground circuit.
The PCM commands the fan on under the following conditions:
?€¢
Engine coolant temperature exceeds approximately 106?°C (223?°F).


?€¢
A/C refrigerant pressure exceeds 1310 kPa (190 psi).


?€¢
A/C is requested and vehicle speed is below 100 km/h (62 mph) with A/C pressure above 1413 kPa (205 psi).


?€¢
Vehicle speed is less than 8 km/h (5 mph) for more than 750 seconds. The fan will turn off when vehicle speed is greater than 8 km/h (5 mph) for more than 20 seconds.

Jun 12, 2015 | 2002 Chevrolet Cavalier

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My ac is not working I have a Chevy Tahoe 2005 the fans won't turn on either .


Hi Maria , The A/C system wouldn't keep the fans from running but none working cooling fans will keep the A/C from working ! This is a fairly complex system if your not familiar with this sort of thing ! I will add the description from the factory service manual.
Cooling Fan Control - Two Fan System
The engine cooling fan system consists of 2 electrical cooling fans and 3 fan relays. The relays are arranged in a series/parallel configuration that allows the powertrain control module (PCM) 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.
During low speed operation, the PCM 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 PCM 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 PCM 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 there own ground path. The result is a parallel circuit with both fans running at high speed.
Do you have a check engine light lit ? The thing to do would have it check at the dealer or a ASE certified repair facility ! They could hook up a advanced scan tool an diagnose fairly quick ! Or you could find a wiring diagram an try testing with a volt meter yourself ! But watch yourself so you don't short out the PCM - engine computer !

May 01, 2015 | AC Cars & Trucks

1 Answer

My 1996 Nissan Maxima only overheats when on incline but I can turn the heat on & it cools down immediately.


Could be the radiator fan. Running the heater adds a second source of getting rid of heat in the coolant. Is the radiator fan running when it is hot ? Are you sure the cooling system is full ?

Oct 08, 2012 | 1996 Nissan Maxima

1 Answer

1999 grand prix gtp second cooling fan will not turn on


How hot is the vehicle running? The second cooling fan is programmed to operate only, like the first cooling fan, at a predetermined engine temperature. It varies by model, if I remember correctly however I think it is 226F for the fan to turn on, and at some point if that does not begin working the second fan will turn on.

May 20, 2012 | 1999 Pontiac Grand Prix

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I have a 99 Honda Accord and the engine sounds fine as long as I am accelerating; however, as soon as Iet off the accelorator, it starts making a noise that sounds as if something is knocking against the...


First check the grade of 'Gasoline' now days they add ethanol,Which can cause engine knock, Second lift the " hood' while auto mobile has been off and cool to prevent cooling fan injury,look for any obstructions,such as a wire's harness,Third i would check catolitic converter for loose heat shield.

Sep 24, 2011 | 2000 Honda Accord

3 Answers

CPU fan races


thanks bigunit12 - as I suspected, no real concern

expect the noise is a pain.

I do think the HS might be marginal and so I shall replace sometime with a higher capacity model, also maybe increase fan flow capacity and add a case hot air extractor fan.

Just to make sure

Jan 07, 2008 | E-Machines T5048 (7136) PC Desktop

2 Answers

How do i add coolant to the ac


First before adding freon is the compressor and fan running? Second, is both the condenser nd evap free from dirt? Please advise, RepairUSA

Aug 30, 2007 | Samsung AW0603B Air Conditioner

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