Question about 1998 Chevrolet Lumina

2 Answers

Overheating At low to moderate speeds, the coolant warms up to the middle of temp band before cooling fans activate. This is a new issue, as the temp usually remains at the low end of the coolant temp "normal" range under all normal driving conditions. NOTE: New Radiator and Thermostat have been installed within the last year.

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  • analytica84 Jan 03, 2014

    Coolant is full and free of air bubbles. Problem is most noticeable when climbing a grade for over one mile at speeds under 50 mph. Heater core has been replaced within the last year. Water pump has been replaced within the last year. Cylinder heads have been overhauled within the last year. Engine size is 3.1. (Isn't it funny how much a person will spend to keep an old car?)

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  • Contributor
  • 15 Answers

Electric cooling fans are switched on by a water temperature sensor. They are not supposed to run all the time. The fans sound to me like they are working correctly, EG they would not be used at speed as the air forced thru the radiator is enough cooling. It the temperature is going higher then before, the new thermostat may have a higher temperature range. That is usually good as the motor is more efficient at higher temp as long as not boiling.

Posted on Jan 03, 2014

Testimonial: "Thank you, Richard."

  • analytica84 Jan 03, 2014

    It's comforting to know that a little extra heat ain't gonna hurt nuttin'. ;)

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  • Chevrolet Master
  • 75,822 Answers

That is normal cooling fan operation. the fans are computer controlled and not turned on until the engine reaches the pre programmed temperature, that is about 185-195F

Posted on Jan 03, 2014

Testimonial: "Thanks for the info, Dennis."

6 Suggested Answers

6ya6ya
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SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

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Posted on Jan 02, 2017

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SOURCE: coolant issue with 1997 blazer

check to see if you have a leak in your heater core,and if the heater core is not leaking you might have a leak on the intake gasket or the head gasket

Posted on Jan 03, 2009

  • 5 Answers

SOURCE: 1996 chevy corsica 2.2 liter

You may have a stopped-up heater core. It's a little radiator inside your dash; it's where the heat comes from. I don't understand why the temp gauge isn't reading any higher than that...

Posted on Mar 19, 2009

  • 409 Answers

SOURCE: Cooling Fan won't come on, coolant flows into overflow tank

there is a switch in the engine intake or cylinder head that controls the cooling fans. The switch is the one with only 1 green wire hooked to it. Turn the key to run, with the engine stopped pull this wire off and touch it to a ground( cylinder head, engine block) and the fan should start, if not look at the fuse, if it does you need to replace the switch.

Posted on Mar 14, 2010

  • 14036 Answers

SOURCE: 2001 Monte Carlo continuously overheating...

DID YOU BLEED THE COOLING SYSTEM.THIS VECHICLE WHEN YOU REMOVE MOST OF THE COOLANT TO REPLACE WATER PUMP OR RADIATOR AND THERMOSTAT YOU HAVE TO BLEED OUT THE AIR TO GET COOLANT TO CIRCULATE PROPERLY. TO BLEED COOLANT SYSTEM WITH ENGINE COOL LOCATE BLEEDER SCREW AT WATER PUMP BY HOSE OPEN BLEEDER SCREW A LITTLE TO LET SOME AIR OUT WHILE YOU.POUR ANTIFREEZE IN RADIATOR.WHEN RADIATOR COOLANT LEVEL STOP DROPPING CLOSE BLEEDER SCREW AT WATER PUMP BYPASS HOSE.START ENGINE LET IDLE UNTIL GET WARM AND COOLANT DROPS IN RADIATOR ADD MORE COOLANT.WHEN COOLANT START RISING AT RADIATOR.PUT CAP ON RADIATOR LET VECHICLE IDLE A LITTLE AT A TIME.UNTIL THERMOSTAT OPENS THEN YOU CAN WAIT A LITTLE WHILE TAKE A LARGE RAG OVER RADIATOR CAP OPEN A LITTLE YOU WILL HEAR AIR STEAM HISS THROUGH CAP BUT DONT OPEN ALL THE WAY.WHEN HISSING STOP SLOWLY OPEN RADIATOR CAP A LITTLE AT A TIME SO YOU WONT GET SCALDED.YOU CRANK ENGINE UP A LITTLE STOP WAIT A WHILE BEFORE OPEN RADIATOR CAP.KEEP DOING THIS PROCEDURE UNTIL RADIATOR COOLANT STOP DROPPING.WHEN COOLANT STOP DROPPING.BLEEDING COOLANT SYSTEM COMPLETE.IF VECHICLE KEEP OVER HEATING CHECK OIL CRANK CASE LOOK LIKE MILK SHAKE YOU HAVE A BLOWN HEAD GASKET.

Posted on Dec 03, 2010

archaeology
  • 662 Answers

SOURCE: 2006 Chevy express van. Normally

You've already eliminated #3 and #6, so keep checking...

Priority Action Part Type Cause
1 Inspect Radiator Cooling System Clogged.
2 Inspect Radiator Radiator Fins Obstructed.
3 Inspect Radiator Cap Worn or Damaged Radiator Cap.
4 Inspect Radiator Fan Motor Faulty Fan Motor.
5 Inspect Belt Incorrectly Routed, Adjusted (Tensioned), Missing or Worn Drive Belt(s).
6 Inspect Thermostat Faulty Thermostat.
7 Inspect Water Pump Worn, Cracked or Leaking Water Pump.
8 Inspect Radiator Fan Relay Intermittent Failure

Posted on Jul 16, 2011

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3 Answers

2006 chevy Silverado Electric cooling fans do not come on. Replaced all relays. Checked the fans by hot wiring them to the battery and they function. Other than the PCM what else could it be?


Did you check the fuses, any voltage at the fuses? In the picture, the left side of relay is control, the pcm grounds the control side of relay. Any applicable trouble codes? Check the coolant temp sensor. I'm not saying replace anything. Will the fans come on if you turn on the ac?
The fans should come on around 220 degrees F. Some makes and models, if you unplug the coolant temp sensor, the fan/s may run all the time? The info I looked at was for 1500--5.3L engine--non-hybrid.
cooling fan 1-a2koxpatrcthkuw0fex1osdc-2-0.jpg

cooling fan 2-a2koxpatrcthkuw0fex1osdc-2-2.jpg

Feb 17, 2017 | Chevrolet Silverado Cars & Trucks

2 Answers

FANS WONT COME ON ,,ALL FUSES,RELAYS AND ELECTRIC FAN MOTORS ARE NEW,,THERMOSTAT IS GOOD,,WHERE IS ELECTRIC FAN TEMP SENSOR LOCATION


op
why not post symptoms first and not a barrage of parts.
must we decode that to a symptom,. kinda hard right.

I will not guess. what is wrong, nor what is not working on your car. now what fans you are talking about, up to 4 fans on cars.

cab blower fan (wild guess blower is ok) and so is HVAC, ?
radiator fans
Condenser fan.

my wild guess to , engine over heats?????????
if yes, the scan it first. no not last FIRST.
it dont work like you think its not a 1988 Samurai.
sorry,
on modern cars, they got smarter, the engine goes
gee the PCM knows water temp why have a fan temp regulator.
hark , now it dont. (saves cash on useless parts)
but has a relay , (well until you have my car and the relay is now 100% electronic, called a huge transistor)
we've used this tech in industry for years, but car makers just learning how still.
i digress. but evolution and history helps diagnosis.
what is there?

Ill look for you, ive posted this 100s of times
the book is 4 bucks to see online. the real deal
lets look now.
XL-7 (the dash matters big time)
answering for , overheats engine, and fans on RAD dead.
(some are staged, PCM brains... now. and also chain ops based on if A/C is on or not) facts.
first I see 2 fans... ok.
the next page shows nice block diagram of the fan system
yup, NOT Simple.

ill post those words for you.
"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 engine control module (ECM) to operate both fans together at low or high speeds. The cooling fans receive positive voltage from the cooling fan relays which receive battery positive voltage from the underhood fuse block.
During low speed operation, the ECM supplies the ground path for the low speed cooling fan relay which is fan 1 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 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 series/parallel relay which is 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 ECM supplies the ground path for the low speed fan relay through the low speed cooling fan relay control circuit. The ECM grounds the high speed fan relay, which is fan 3 relay, and the series/parallel relay, which is fan 2 relay through the high speed cooling fan relay control circuit. This energizes the series/parallel 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 fan 2 fuse 1 on the cooling fan motor supply voltage circuit to the right cooling fan. During high speed fan operation, both engine cooling fans have their own ground path. The result is a parallel circuit with both fans running at high speed.
When the request for fan activation is withdrawn, the fan may not turn OFF until the ignition switch is moved to the OFF position or the vehicle speed exceeds approximately 16 km/h (10 mph). This is to prevent a fan from cycling ON and OFF excessively at idle.
end quote.

i bet you didnt scan it , like 99.9 % of all posters here dont.
DTC Descriptors
DTC P0480: Cooling Fan Relay 1 Control Circuit
DTC P0481: Cooling Fan Relay 2 Control Circuit
DTC P0691: Cooling Fan Relay 1 Control Circuit Low Voltage
DTC P0692: Cooling Fan Relay 1 Control Circuit High Voltage
DTC P0693: Cooling Fan Relay 2 Control Circuit Low Voltage
DTC P0694: Cooling Fan Relay 2 Control Circuit High Voltage
Diagnostic Fault Information

is the ECT showing overheat, yes no?
if yes, it must operate a fan or 2.
the book even covers all tests for fans dead, in a large truth table.
both the FSM and alldata.com have that, its no secret ,its published in 4 major places.

lets back up
if the engine coolant is low (no that side tank the engine and rad)
the ECT will lie. if that happens the fans may not come one
that is because the ECT is useless measuring air, for water.
that water must touch ECT for ECT to work.
this is FIRST
then scan the ECT does it show overheating, IT must if it IS overheating. fix that next if it lies to you,(IR gun in hand)

The system has staged fans.
i cant find the trip points in my crappyy online pages.
but is like 225f then 250f trips. is my guess...
about. if the engine over heats, check fuses first then scan it.
it will simply tell you why its bad.
eg, fan1 output dead.
or if you hot wire a fan and its dead, then it is.
(only on cars with non modulated fans,,hot wire them,else not.)

now the link to the 4 buck real book.
the non dash XL7 (my guess) you this pick yourself... cant see car.
https://suzukipitstopplus.com/Products/10182-2007-xl7-service-manual.aspx

this is how it really works
the ECU has software that decide trip points for fans.
hard coded, this is. based on how hot it is and if A/C is on not.
its way smarter than 1988 and better.
the DTC errors can see an open line, shorted to ground or stuck 12v.(runs all time error)
(tells you relay is good or not)

25839272-0kjd5huq4lpr130nt243wle5-3-0.jpg no scanner no joy , sorry, tis a fact.....

25839272-0kjd5huq4lpr130nt243wle5-3-2.jpg

Aug 27, 2015 | 2007 Suzuki XL-7

1 Answer

Mitsubishi Lancer 2006 cooling / rough idle issue


Sensors do not always throw codes if they are close to normal parameters, needs to be checked with a scan tool and thermometer.

There is usually a high and a low speed fan relay, as well as a separate A/C fan relay (also high) Your High speed fan relay could be bad, or the fuse for it.

Engine idle surging usually means the coolant is boiling and there is no longer liquid in the throttlebody causing it to go to a high idle because it thinks the engine is cold. Warm coolant closes a valve lowering the idle on most Japanese makes of that year.

Also, sometimes Thermostats stick half open and do not allow enough flow. AND sometimes in neglected cooling systems Water pump Vains are eroded by electralosis causing low coolant flow as well. And a Clogged radiator can also cause this, as by the time the fans run on high it's to late.

May 22, 2014 | 2006 Mitsubishi Lancer

1 Answer

Overheating


Could be an impeller issue giving reduced water flow.

Aug 01, 2017 | 1998 Chevrolet Lumina

1 Answer

1991 saturn sl1 is overheating, new thermostat installed, fan is functional, suspecting sensor? and if so, where is it?


Try this for a diagnostic:
Check coolant level. Fill if necessary. Check for leaks.
Start vehicle. Allow to run.
Observe coolant temp gauge. It should slowly climb to center.
Once coolant temp gauge reaches the middle, the coolant fan is triggered to activate by the vehicle's computer (ecm). Fan should come on until temp drops slightly then cycle off.
If fan is working, move to next step. If fan isn't working, possible causes:blown fuse, faulty fan relay, coolant fan switch, faulty cooling fan.
Next step.
If there are no leaks, and the fan works properly as described above, have a compression test performed. This test will basically measure the compression power (in PSI) in each cylinder by screwing a device into the spark plug hole of each cylinder cranking the vehicle (with ignition disabled) and observing the gauge. Each cylinder reading should be significantly close to its next one. If not, suspect a faulty cylinder head gasket.

Aug 28, 2011 | 1991 Saturn SL1

1 Answer

05 Silverado, overheats when in 4-wheel drive under strain. Fixed once(so I thought) by replacing the water pump and thermostat. Happened a few months later. Again, 4-wheel, under strain. Wound up...


Instrument cluster - GM had problems with a part inside the cluster , Stepper motor , These faulty step motors caused the gauges to act erratically . 2003 to 2006 ! ALL GM vehicles . Just replaced a cavalier instrument cluster for what customer thought was a over heating problem .The fans come on low speed when engine temp. reaches 220 degress
The PCM commands the low speed cooling fans ON under the following conditions:
• Engine coolant temperature exceeds approximately 104.25°C (220°F).
• A/C refrigerant pressure exceeds 1447 kPa (210 psi).
• After the vehicle is shut OFF if the engine coolant temperature at key-off is greater than 101°C (214°F) the low speed fans will run for a minimum of 60 seconds After 60 seconds, if the coolant temperature drops below 101°C (214°F) the fans will shut OFF. The fans will automatically shut OFF after 3 min. regardless of coolant temperature.
The PCM commands the high speed fans ON under the following conditions:
• Engine coolant temperature exceeds approximately 107.2°C (225°F).
• A/C refrigerant pressure exceeds approximately 1824 kPa (265 psi).
• When certain DTCs set.
At idle and very low vehicle speeds the cooling fans are only allowed to increase in speed if required. This insures idle stability by preventing the fans from cycling between high and low speed.

Mar 31, 2017 | 2005 Chevrolet Silverado

2 Answers

The cooling fan on my 2001 ford escort SE will not work normally


Check the coolant temperature with the car stopped. At idle with the hood up keep the thermometer in the coolant. Confirm if the coolant is not overheating but the engine is!!

Run the A/C keeping the thermometer in the coolant and allow the fan to kick on.

If with the A/C on the engine doesn't overheat then it confirms that the low speed on the fan motor is not working. Read the description of the Taurus where the low speed is used for normal operation when temperature is required but the high speed is activated when the A/C is on. The circuit is simple.

In your case the low speed has to be activated for the A/C to go into the high speed. The fact that the high speed is working and low speed is not indicates the low speed of the fan is defective.

Other problems such as the thermostat or plugged cooling system(radiator clogged) could be the root problem!

Hope this helps?
2010-09-05_004249_03_focus_cooling_fan_resistor-3xudhdxidxafwe4mdbsnm14c-4-0.jpg

dual_speed_fan_diagram-3xudhdxidxafwe4mdbsnm14c-4-2.jpg

Jun 24, 2017 | Ford Escort Cars & Trucks

1 Answer

At high speed engine temperature is Ok, at low speed or idle it warms up to over half way and the coolant level warning light comes on. There is plenty of coolant, an new water pump and a new thermostat....


is cooling fan coming on?? the coolant level light pertains to a sensor that is in radiator side tank that is notorious for going bad you may have two seperate problems normal temp at high speed tells me the wind passing across radiator is keeping cool when stopped or in traffic as temp increases pcm commands fan to come on if it does,nt you will heat up

Mar 19, 2010 | 2000 Oldsmobile Silhouette

2 Answers

High Idle 2000 Saturn S series


Definately have a sensor problem...but that may not be all. You can blame the sensor issue on the idling problem. The overheating in park is likely one of 2 things, provided you have adequate coolant. #1 a sticking thermostat or a bad coolant temp sensor not activating your fan at idle. What you should do is have your diagnostic codes read in order to take care of the sensor issue. Most national parts chains such as Auto Zone or Advance will do this at no charge in hopes of selling you a sensor. Good Luck! I hope you find this to be very helpful.

Feb 18, 2010 | 2001 Saturn S-Series

2 Answers

How do you know if your engine is overheating? the coolant says 210 degrees wut do i do


When your engine is operating normally, the temp on the gauge should be between 190 and 225. The thermostat is set to open at 190 and this controls minimum engine temp. If you sit in traffic the temp will climb to 225 and then the cooling fan will begin to operate to make sure that you don't overheat.You know that water boils at 212 but you have to add 10 degrees for every pound of pressure the rad cap is set to. Also your coolant has antifreeze in it which raises the boiling point even more. A normal overheat condition of your engine would be 300 or more. Does this help?

May 15, 2009 | 2005 Chevrolet Cobalt

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