Cooling fan running high almost at all times

Anselmo Mechanic Bakersfield, California Posted   Latest  
Resolved
Driveability
Electrical
2009 Nissan Maxima SV 3.5L (VQ35DE) (RE0F09B)
Cooling Fan Running High Almost At All Times

This 09 Nissan Maxima has the cooling fan running high around 90% of the time even during 40 to 60 degree winter time, it is not low on radiator coolant, the temperature gauge stays in the middle almost at all times but can go up to near high temperature going uphill, normal for temperature to increase on incline on any vehicle but this one nearly reaches the top with the AC off and at regular speed. Thanks in advance for any help!

0
JJ Technician
Quincy, Massachusetts
JJ Default
   

Any codes? What does ECT read at idle on a scan tool and how high does it get on a road test?

0
Default Ð Bounty Awarded
Peter Technician
Dallas, Texas
Peter Default
   

fan speeds? have you checked relays? i see 3 of them in the diagram. This car also has a power intelligent distribution module have you check that?

0
Default Ð Bounty Awarded
Albin Diagnostician
Leavenworth, Washington
Albin Default
 

From service information = description of operation "COOLING FAN CONTROL IPDM E/R controls cooling fans according to the status of the cooling fan speed request signal received from ECM via CAN communication. " and "*1: The ECM determines the start signal status by the signals of engine speed and battery voltage. *2: This signal is sent to ECM via the CAN communication line. SYSTEM DESCRIPTION…

+2
Default Ð Bounty Awarded
JB Owner/Technician
Minneapolis, Minnesota
JB Default
 

Verify if this vehicle has a combination condenser/radiator assembly. We had one do almost the same thing (except it would completely overheat because it was summer). Use your blow gun or a hose to try blowing out the radiator/condenser assembly (assuming it is that style). I'd bet it's packed with sand and dirt. If so, replace it and flush the coolant for good measure.

0
Default Ð Bounty Awarded
Richard Technician
Stony Brook, New York
Richard Default
 

It sounds like the radiator may restricted. That description of temp increasing uphill would be indicating some type of cooling system issue. Are there any codes at all? Is it running good with no misfires?

-1
Default Ð Bounty Awarded
Victor Owner/Technician
Doral, Florida
Victor Default
 

Is there any signs of engine overheating?

0
Default Ð Bounty Awarded
Randy Diagnostician
Glendora, California
Randy Default
 

If fan is running high speed all the time . Even on freeway it is causing a air flow problem through radiator because fan is running. Disconnect fan motor and with ac off drive again on freeway and see what it does . If problem goes away diag speed control problem for fan circuit

+1
Default Ð Bounty Awarded
Paul Mechanic
Harvey, Illinois
Paul Default
 

Did you verify if your feeling any heat coming off of radiator in respect to indicated temperature? Perhaps you have an issue with thermostat or radiator and your chasing symptoms instead of cause?

0
Default Ð Bounty Awarded
Anselmo Mechanic
Bakersfield, California
Anselmo Update
 

The scanner shows normal temperature at 220, no codes, no issues driving, no misfire but the radiator hose has no pressure.

0
Update Ð Bounty Awarded
Dario Owner/Technician
Grand Prairie, Texas
Dario Default
 

Maybe an air pocket? I would vacuum out cooling system

0
Default Ð Bounty Awarded
Paul Mechanic
Harvey, Illinois
Paul Default
 

What about temp? At 220, you should feel temp on both hoses and is radiator giving off heat? Did you do a full module check/scan for other codese that may pertain to pulling fan in as a safety issue-hvac, bcm etc..

0
Default Ð Bounty Awarded
Albin Diagnostician
Leavenworth, Washington
Albin Default
   

Cooling system problems most times are pretty basic in nature. From what I have read posted about your problem, is the cooling fans are running most of the time, and will continue to run on high speed. The cooling system radiator is designed to transfer the heat from the hot coolant to the atmosphere. The engine coolants job is to transfer the heat from the engine to the radiator where it can…

+1
Default Ð Bounty Awarded
Helpful
Anthony Technical Support Specialist
Kirkwood, Pennsylvania
Anthony Default
 

Hi Anselmo: Along with what Albin wrote, there are 2 things that you may wish to keep in mind. 1: If a radiator is at the front of the vehicle, it doesn't need a fan while being driven at cruising speed unless the airflow is blocked. 2: I seriously doubt that 220 degrees is "normal". Guido

+1
Default Ð Bounty Awarded
Anselmo Mechanic
Bakersfield, California
Anselmo Resolution
 

Thanks all for your support, following Albin instructions to use the infrared thermometer, I went ahead and used it and found uneven (cold / hot) temperatures along the radiator and the thermostat, so I replaced the thermostat and road tested the car and it appears to have solved the problem. again thank you all.

+1
Resolution Ð Bounty Awarded
Thanks