Question about 1999 Chevrolet Malibu

1 Answer

How do i check the fan relays and the fans to see if they work

New thermostat, new hoses, and new ECT

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  • shaun loeffler Feb 26, 2012

    ecm side? i already put new coolant sensor in.

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  • Expert
  • 151 Answers

Unplug the coolant sensor and the fan should come on when u unplug it
the ecm grounds the fan relay so the relay gets power all the the time
13 year old malibu most likely the fan motor is bad put direct power to it.

Posted on Feb 25, 2012

Testimonial: "unplugged ect and fans kicked on. so i assume the fan motor is fine?"

  • hank5899
    hank5899 Feb 26, 2012

    yes the fan motor is good and so is the ecm side you need a cooant sensor

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6 Suggested Answers

6ya6ya
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Posted on Jan 02, 2017

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leetamara
  • 702 Answers

SOURCE: Cooling fan wont work

The water temp sensor is located near the thermostat housing. This sensor is what tells the ECM to turn the fan on/off. The water temp sending unit is located near the same area. You know you have the correct sensor is because the water temp sensor has a 2 prong plug. The water temp sending unit only has 1 prong.

Posted on Sep 27, 2008

USfalcon
  • 175 Answers

SOURCE: 2000 cavalier 2.2L cooling fan will not come on

after you check the grond in the fan conector and all the fuses i can say its coolent temp sensor.

Posted on Mar 14, 2009

greg_margo
  • 1959 Answers

SOURCE: PO481 code Chevy IMPALA 2003

Looked it up in Chilton's, confirmed in http://www.obd-codes.com/trouble_codes/

P0481 Cooling Fan 2 Control Circuit Malfunction

Each fan will throw a different code. See 3 fans listed for your model. Here's a link for the wiring schematic: http://www.chiltonlibrary.com/content/images/WD/GM/014/WD_GM_014788.pdf


Best of luck.
Greg

Posted on May 23, 2009

  • 4 Answers

SOURCE: engine cooling fan not coming on

It may be the fan itself. Try to find the plug going to the fan, it should be close to the fan and might plug diresctly into the relay. Use two jumper wires straight from the Bat one from the pos+ side and one from the neg- side and plug them into the two holes in the connector the fan should start WATCH YOUR FINGERS. If it starts its elec prob before the fan if not its the fan.

Posted on Jun 12, 2009

  • 31 Answers

SOURCE: secondary fan on impala SS 1996 not operating. fan

The PCM controls these fans via certain sensor inputs, ( CTS ) and switches ( A/C compressor for instance ). When relays are removed, both relays sockets should show 12v constant ( battery voltage on "switch side" ). When the key is rolled on, there should be 12v appear in two more places, ("Coil side" ) the relays are then operated by a ground signal from the PCM. ( Powertrain Control Module ) You need a scan-tool to check for fan request, by the PCM. A/C compressor request, etc. If you have any DTC's then repairing them may well fix your problem, otherwise, you may have a faulty PCM.

Posted on Oct 24, 2009

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1 Answer

2005 montana sv6 sitting in traffic temp gauge goes up codes P0128 and P0481 present


DTC P0128 Engine Coolant Temperature (ECT) Below Thermostat Regulations Temperature
An engine coolant temperature (ECT) sensor monitors the temperature of the coolant. This input is used by the powertrain control module (PCM) for engine control and as an enabling criteria for some diagnostics.
The air flow coming into the engine is accumulated and used to determine if the vehicle has been driven within the conditions that would allow the engine coolant to heat up normally to the thermostat regulating temperature. If the coolant temperature does not increase normally or does not reach the regulating temperature of the thermostat, the diagnostics that use ECT as enabling criteria may not run when expected.
If the PCM detects the calibrated amount of air flow and engine run time have been met, and the ECT has not met the minimum thermostat regulating temperature, DTC P0128 sets.

P0481
Cooling Fan Relay 2 Control Circuit
PCM
DTC P0480 or P0481

Have you changed the thermostat ?
Do you know how to test cooling fan relay (S)
Battery positive voltage is supplied to the cooling fan 1 relay from the COOL FAN #1 fuse. The powertrain control module (PCM) controls the cooling fan 1 relay by grounding the low speed cooling fan relay control circuit via an internal solid state device called a driver.
Battery positive voltage is supplied to the cooling fan 2 relay and the cooling fan 3 relay from the COOL FAN #2 fuse. The PCM controls the relays by grounding the high speed cooling fan relay control circuit.
When the PCM is commanding a relay on, the voltage potential of the control circuit should be low, near 0 volts. When the PCM is commanding the control circuit to a relay, the voltage potential of the circuit should be high, near battery voltage. If the fault detection circuit senses a voltage other than what is expected, the DTC will set.
The PCM will monitor the control circuit for the following conditions:
• A short to ground
• A short to voltage
• An open circuit
• An open relay coil
• An internally shorted or excessively low resistance relay coil
When the PCM detects any of the above conditions, the DTC will set and the affected driver will be disabled.

Jul 01, 2017 | Cars & Trucks

1 Answer

Where is the Coolant ECT Senor and my Thermostat on a 2005 Mazda Tribute . I know it's a 2.3 Liter V-6


If its a 2.3 it should be a 4 cyl. The V6 engine is a 3.0 cu in.
The thermostat should be under the housing where the upper radiator hose connects, and the sensor should be nearby.
If the thermostat is not in the upper housing check the lower radiator hose connection.

Apr 02, 2016 | Mazda Cars & Trucks

1 Answer

Temp guage running low. Only about 1/4 when it shoud be about 1/2???


Before you replaced parts did you feel the upper radiator hose ,as close to the engine as possible , From a cold start you would be able to tell if thermostat was opening ,by change in temp ! Check heater hose's going through the fire wall to inside vehicle . When vehicle is warmed up are both hose's hot to the touch ? I would suspects the temp . gauge before the coolant temp. sensor , Because I know GM has had problems with the stepper motors that control the gauges .
The instrument panel cluster (IPC) displays the engine coolant temperature (ECT) as determined by the engine control module (ECM) or the powertrain control module (PCM). The IPC receives a class 2 message from the ECM/PCM indicating the ECT. The range on the ECT gage is between 60-125?°C (140-260?°F). The ECT gage defaults to 60?°C (140?°F) or below if the ECM/PCM detects a malfunction in the ECT sensor circuit. Refer to Cooling System Description and Operation.
Class 2 is a serial data communication network ,found on GM vehicles , Vehicle computers share information on this network .
How's the antifreeze ? does the vehicle still have the original dex-cool antifreeze ? You haven't change the coolant with green coolant ? Dex-cool an regular green coolant don't mix , they gel up clogging heater cores ,passages in the engine block etc...

Jan 10, 2016 | 2006 Buick Rendezvous

1 Answer

Where is the thermostat located on my 2000 madza b2500?


  1. Disconnect the heater return hose at thermostat cover. Disconnect ECT sensor and water temperature sender unit. Disconnect the upper radiator hose from the outlet connection. Remove the bolts. Pull elbow away from the cylinder head. Remove the thermostat and gasket.
The thermostat cover casting contains a locking recess into which the thermostat is turned and locked.
>
Do not use more than 15 - 20 ft ibs to tighten the thermostat housing bolts.

Mar 30, 2015 | 2000 Mazda B-Series

1 Answer

Need to put a thermostat in a 2000 madza b2500


  1. Disconnect the heater return hose at thermostat cover. Disconnect ECT sensor and water temperature sender unit. Disconnect the upper radiator hose from the outlet connection. Remove the bolts. Pull elbow away from the cylinder head. Remove the thermostat and gasket.
The thermostat cover casting contains a locking recess into which the thermostat is turned and locked.

Do not use more than 15 - 20 ft ibs to tighten the thermostat housing bolts.

Mar 30, 2015 | Mazda Cars & Trucks

3 Answers

Where is sensor for radiator fan located


this is covered 100% in the FSM.
but first youd have to be on the right engine page, and was not stated by you.
4L or 4.7L ?
you could read all this for free., (posted 100 times)
http://www.jeep4x4center.com/knowledge-base/index.htm?utm_source=cj#service

the schematic is 8w-42 (chapter 8w is electrics)
see "wiring AIR-------" page
page 9 .
42-9 4.0L only.
you see what.? a fuse F10 (blown)
you see the fan controller
and the fan relay
and the fan.
and THE PCM
the PCM decide when the fan is on, or off.
so..... if the thermostat is stuck open, the ECT shows, low heat
and the fan never turns on.
so did you do the FSM fan test? in the book.?
it shows how to do that. it has you overheat the engine on purpose
(idling it too long)

the 4.7L is totally different so, no engine stated, all answer will be wrong.

Apr 13, 2014 | 2000 Jeep Grand Cherokee

1 Answer

Changed the radiator but the car is still running hot


Some thing too check:
Make sure coolant level is up to line and clean (not dirty, do to clogged radiator, may need to be flushed or replaced).
Make sure air flow through the out side of radiator is clear (dirt, leaves, ect..) .
Make sure fan is working properly equip t (is not running too slow). Or Manual (belt driven) fan clutch is working properly, not loose or spinning too freely?
Check for broken or cracked fan blades itself.
Check radiator cap, (no gasket tears).
Could be thermostat going bad ?
Could be coolant temperature Relay or sensor/switch (from computer) going bad?
Check radiator hose(s) (too soft, may collapse)?
In some rare cases:
Timing could be off.
Could be water pump.
Could be blown head gasket(s).
Could have cracked head(s).
ECT..............Hope this was some help???


Sep 15, 2011 | Hyundai Tiburon Cars & Trucks

1 Answer

My mazda protege is running hot and the radiator has water


Some thing too check:
Make sure coolant level is up to line and clean (not dirty, do to clogged radiator, may need to be flushed or replaced).
Make sure air flow through the out side of radiator is clear (dirt, leaves, ect..) .
Make sure fan is working properly equip t (is not running too slow). Or Manual (belt driven) fan clutch is working properly, not loose or spinning too freely?
Check for broken or cracked fan blades itself.
Check radiator cap, (no gasket tears).
Could be thermostat going bad ?
Could be coolant temperature Relay or sensor/switch (from computer) going bad?
Check radiator hose(s) (too soft, may collapse)?
In some rare cases:
Timing could be off.
Could be water pump.
Could be blown head gasket(s).
Could have cracked head(s).
ECT..............Hope this was some help???


Sep 14, 2011 | 1994 Mazda Protege

1 Answer

My 2001 ford winstard try to overheating when I drive bumper to bumper or I stopeed.


Some thing too check:
Make sure coolant level is up to line and clean (not dirty, do to clogged radiator, may need to be flushed or replaced).
Make sure air flow through the out side of radiator is clear (dirt, leaves, ect..) .
Make sure fan is working properly equip t (is not running too slow). Or Manual (belt driven) fan clutch is working properly, not loose or spinning too freely?
Check for broken or cracked fan blades itself.
Check radiator cap, (no gasket tears).
Could be thermostat going bad ?
Could be coolant temperature Relay or sensor/switch (from computer) going bad?
Check radiator hose(s) (too soft, may collapse)?
In some rare cases:
Timing could be off.
Could be water pump.
Could be blown head gasket(s).
Could have cracked head(s).
ECT..............Hope this was some help???


Aug 18, 2011 | 2001 Ford Windstar

1 Answer

My 2003 saturn ion is over heating i had the thermostat changed and new hoses put on and it still over heats


Could be a Bad radiator Cap? Low Water? Clogged radiator? Not enough air flow, Do To.... Dirty radiator fins? Bad Fan Clutch or Electric fan not running? Timing Off? Stuck closed Thermostat? Bad Water Pump? Blown head Gasket(s)? Cracked Cylinder Head(s), ECT....

Jul 19, 2011 | Saturn Relay Cars & Trucks

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