Question about 2006 Chevrolet Cobalt

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Coolant fan doesnt run.when stopped in traffic temp.goes up to221 when driving coolant temp. goes back to 192

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MAKE SURE THE COOLING FAN IS NOT RUNNING THEY DONT TURN ON UNTIL 220

Posted on Oct 14, 2010

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08 Ford Explorer 4.0L - At times the coolant goes through the radiator cap into the recovery tank, filling it, same time temp gauge rises Changed tstat and cap. I think it is a clogged radiator


possible and an accredited radiator shop will be able to do a flow test to check that
unfortunately , it indicates a gasket or cracked problem so have a compression test done to eliminate that
if that test proves good then have the thermostat removed and checked/replaced if the engine runs a viscous fan hub then check that as well
viscous fan hub failure is most noticeable when stopped at lights ( temp gauge goes up but comes back down when moving along the road) temp rises in slow moving traffic , using high engine rpm as in up hill or any condition where the air is not moving through the radiator unless the vehicle has speed
if you have electric fans then the problem may be in the coolant SENSOR unit that sends the temp to the ECM to switch on the fans

Nov 06, 2016 | Ford Cars & Trucks

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1997 Chevy Lumina 3.1 engine. The cooling fans aren't coming on tell the car heats up to over 250 degrees.


Did you check for applicable trouble codes? Anything? Some of the national brand auto stores will check codes for free.
Check the coolant temp sensor, if you haven't already? Some makes and models if you turn on the ac, the fan/s will run. If you unplug the coolant temp sensor, the fan may run.
I might want to use non--contact infrared temp gun just to double-check temp gage.
Have you ever checked thermostat or coolant flow through the radiator. I understand it only heats at idle.

Mar 14, 2016 | Cars & Trucks

2 Answers

My engine temp gauge goes way up when the car is stuck in traffic, when I begin to roll the temperature gauge goes back down. I assume that this is a sensor issue, can this be changed easily?


I would assume that the sensor is probably doing EXACTLY what it is designed to do....measure engine temperature! An engine will get hot when sitting in traffic if the radiator cooling fans are not working. The engine temperature will then go back down when the vehicle starts moving and air begins to flow through the radiator.
Get your radiator cooling fans checked!

Please also review this article: What Else Could Be Wrong?

May 09, 2011 | 2000 Hyundai Elantra

1 Answer

My 2005 Dodge Ram 3.7 keeps overheating in city, or ''stop and go'' driving. It goes to normal temp when I am on the highway at a consistant speed.


In stop and go traffic will normally cause a car/truck to heat up more using the a/c. The most common cause is low coolant in radiator or a sticking thermostat. Check the coolant in radiator and check the front of radiator for any restriction to the air fins on radiator causing a blockage to keep the air from cooling the radiator. Check the clutch fan when cold by turning it by hand, if it turns free it will be ok. If you had run the truck and the coolant is hot try turning the fan by hand and if it turns free at that point the fan will be no good. Replace the fan. Hope this will help you.

Jun 02, 2010 | 2005 Dodge Ram 1500

1 Answer

My 1997 acura integra overheats while stopped at traffic lights but runs great while driving.- what causes this?


This sounds like the electric cooling fans aren't turning on. Could be a bad coolant temp fan sensor, or the associated wiring to it

Jan 04, 2010 | 1997 Acura Integra Type R

3 Answers

Recently had a thermostat replace on my 2003 chevrolet impala


sounds like the fan motor is not coming on.open hood start engine and let it run until it has had time to fully warm up and see if the fan comes on if not then check fan relay and fan motor

Nov 10, 2009 | 2003 Chevrolet Impala

1 Answer

95 contour 220.000k 4cyl 5 spd temp gauge goes over half and check engine light goes on almost instant but i still drive and temp goes down for a bit and light goes out only when i turn engine off and...


Coolant sensor may be the problem. It is located near the thermostat housing. It may be sticking between modes & not operating properly.Also make sure coolant is circulating in system.

Sep 09, 2009 | 1995 Ford Contour

1 Answer

2004 xterra temp rises when stopped, goes back down when moving


sounds to me like the thermostat may be stuck. i would check the coolant, fan, and belts.

Dec 13, 2008 | 2005 Nissan Xterra

1 Answer

1990 jeep cherokee 6cyl inline- electric radiator fan inop.


the aux fan only works when the ac is on, and has come to a predetermined temp(?) i found this out while going up a long grade in the back country without the ac on and later found out the radiator was half plugged!

Nov 18, 2008 | 1990 Jeep Cherokee Limited

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