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I change the relay fan almos every 3 months you know why?

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I would suspect a short in the wires or a bad connecton /loose connectoin would not be a bad idea to put this jeep on a anilasier it will tell you right away.adrian,,,,,

Posted on Aug 21, 2010

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I have an 05rendezvous,need to locate switches for cooling system,fans aren't co ming on & now I'm going to need a new radiator,cuz plastic broke.But it broke before fans gave out.Which I changed stat


The engine cooling fan system is controlled by the body control module (BCM) and the powertrain control module (PCM) or engine control module (ECM). The BCM performs the calculations as to how long, when and what speed the cooling fans should turn on. The BCM then sends a class 2 message to the PCM/ECM to engage the cooling fan relays. If there is a malfunction with the BCM, the PCM/ECM will control the engine cooling fans independently. The engine cooling system consists of 2 electrical cooling fans and 3 fan relays. The relays are arranged in a series/parallel configuration that allows the PCM/ECM to operate both fans together at low or high speeds. The cooling fans and fan relays receive battery positive voltage from the underhood accessory wiring junction block. The ground path is provided at G100.
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 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 2 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 3 or S/P relay and the cooling fan 2 relay through the high speed cooling fan relay control circuit. This energizes the cooling fan 2 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 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.
The BCM and PCM/ECM command Low Speed Fans on under the following conditions:
?€¢
Engine coolant temperature exceeds approximately 106?°C (223?°F).


?€¢
A/C refrigerant pressure exceeds 1 310 kPa (190 psi).


?€¢
After the vehicle is shut off if the engine coolant temperature at key-off is greater than 140?°C (284?°F) and system voltage is more than 12 volts. The fans will stay on for approximately 3 minutes.

The BCM and PCM/ECM command High Speed Fans on under the following conditions:
?€¢
Engine coolant temperature reaches 110?°C (230?°F).


?€¢
A/C refrigerant pressure exceeds 1 655 kPa (240 psi).


?€¢
When certain DTCs set.


The three relays are located in the under hood fuse / relay box ! You need to have it checked for DTC'S -diagnostic trouble codes ! An you need a GM Tech 2 scan tool !
This diagnostic procedure supports the following DTCs:
?€¢
DTC P0480 Cooling Fan 1 Relay Control Circuit


?€¢
DTC P0481 Cooling Fan 2 and 3 or S/P Relay Control Circuit


?€¢
DTC P0691 Cooling Fan 1 Relay Control Circuit Low Voltage


?€¢
DTC P0692 Cooling Fan 1 Relay Control Circuit High Voltage


?€¢
DTC P0693 Cooling Fan 2 and 3 or S/P Relay Control Circuit Low Voltage


?€¢
DTC P0694 Cooling Fan 2 and 3 or S/P Relay Control Circuit High Voltage


  1. Install a scan tool.
  2. Turn ON the ignition, with the engine OFF.
  3. With a scan tool, command the Fans Low Speed ON and OFF.
Do the low speed engine cooling fans turn ON and OFF with each command?
Go to Step 3
Go to Step 4

3

Important:: A 3 second delay occurs before the powertrain control module (PCM)/engine control module (ECM) changes the cooling fan speed.
With a scan tool, command the Fans High Speed ON and OFF.
Do the high speed engine cooling fans turn ON and OFF with each command?

Aug 08, 2015 | Cars & Trucks

1 Answer

How to change my fan relay on my 2003 suzuki aerio


which fan? there can be 3 fans.
1 cab blower
engine fan
a/c condenser fan/
why not say , my x is dead, name x then ask for fuse and relay
answers are all USA spec, car, this is USA forum.
ill toss dice and land , engine cooling fan. (no engine stated so...."?)

engine rad fan, fuse 23 (if blown kills spark so.... not that...)
Radiator fan control relay #1 and 2 and 3
there are 3 relays, both fed from fuse 8
a 3 speed fan it is. , fan has 4 wires , one ground and 3 speed feeds.

i have the schematic.
below is under hood fuse box. main.
if you were to look at lid its marked.



25604996-n5sqgovpamq22s5pgsawcjbj-5-0.jpg

Mar 24, 2015 | 2003 Suzuki Aerio

1 Answer

My mechanic installed complitelly new engine fans and relay a month ago. After that ralay keep become bad. Tomorrow I actually going to change relay for the third time. ANY IDEA???


How do you know you had any bad relays?

They have to be tested-- as with any part

No parts ever get changed until they fail a test

If they fail --you have to know if the primary coil
failed or the contacts burned up

You have to diagnose & resolve the main issue

Your not doing that--- nor did the repair shop

Does changing a relay over & over seem like a fix?

No---- it is not the problem.

If you don't have the experience -- describe the issue to a
different shop

Nov 18, 2012 | 1998 Plymouth Voyager

1 Answer

Cooling fans keaps burning the relay module


recheck the wires that go to the fan and module for damage from the crash and when you install the module you move wires around and the connection is made for a while

Aug 20, 2012 | 2001 Volkswagen Beetle

1 Answer

I have replaced the cooling fan relay 3 times in the past 4 months and it needs replaced again. How can i solve this problem?


Sounds like the Cooling fan motor may be seizing up when it gets hot causing the relay to fail, try replacing the fan motor & relay.

Nov 14, 2010 | 1999 Jeep Grand Cherokee

2 Answers

Overheating at idle


That's because cadillac replaced it with an upgraded switch. to find out if your relay is bad bypass the relay and directly jump the fans to find out if the fans still work. if you don' know how to do this find a friend that does.

Jul 05, 2009 | 1999 Cadillac DeVille

1 Answer

Where is the radiator fan relay on a 2006 grand caravan


The cooling fan control relay is located behing the grill in a crossmember (see the pic). It works in conjuction with the Integrated Control Module.

e0ef069.jpg1. Grill
2. Fan control relay
3. Rivet
4. A/C condenser

Hope this helps.

Jun 06, 2009 | 2006 Dodge Grand Caravan

1 Answer

Radiator


ok ,generally on this car the fan relay is located in fuse box near the battery car

Apr 24, 2009 | Dodge Grand Caravan Cars & Trucks

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