Question about Cars & Trucks
When I driveThe temperature gauge constantly goes from cold to hot.
Posted by Anonymous on
James from Auto.Repairs
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I'am feeling that your issue is not really with the thermostat my friend. what your describing seems to be the coolant temperature sensor.
And or a loose connection to the sensor
Try turning the key on engine off and look at the coolant gauge
now go out and under the hood it should be in the thermostat housing where the thermostat goes to you should see the #1 picture with 2 wires going to it if you unplug it and go back into the car and look at the gauge it should be in the red hot zone.
if not then your gauge has a short to it lightly with your palm of your hand rap on top of the dash nearest to the gauge and see if it tries to go up if it does then most likely it is a short in the cluster or harness.
and if when cts is unpluged and it goes all the way in the hot zone and when you plug it back in and it goes back into the cold and stay there should be that it is fine just loose connector or needs cleaned if when you wiggle wires and the needle goes up and down then you need to replace the plug and I would still suggest replacing the coolant temp sensor as for it may have been shorted do to the loose connection.
Posted on Sep 08, 2014
Drain the cooling system at the radiator, the thermostat is located where the upper radiator hose attaches to the engine, remove the hose, then remove the water neck exposing the thermostat, remove and replace the same way the old one came out, then install the water neck and hose, tighten all fasteners, clamps and refill cooling system to manufacturer procedure to properly "burp" the system.
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Posted on Sep 08, 2014
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Posted on Jan 02, 2017
SOURCE: 1999 Dodge Durango NO HEAT
Bad NEW thermostat? I had the same problem on my first generation Dakota. The problem for me turned out to be the DODGE thermostat I used to replace the old Dodge part. I went and got a Stant from local auto parts store using the standard temperature spec and quit shivering the next time I drove it. I hope that helps!
Posted on Jan 17, 2009
Sounds like your temperature actuator is not moving or your temp door is broken. On max a-c ,coolant is shut off to your heater core allowing only cold air in.
Posted on Jan 26, 2009
Suzuki thermostats, more often than not, tend to fail OPEN when they have been overheated - which is a good thing! If they failed shut, you would really cook the motor. Change the thermostat. Also, find the cause of the initial lack of coolant.
Posted on Sep 21, 2009
Check the gauge by holding in the trip odometer reset button and turn key to run,hold button for 10 seconds this will iniate a diagnostics on all the gauges,and lights if gauge doesn't move during this test replace gauge,if it does move then check the wires on the plug at the engine coolant temp sensor (ects) you can check the sensor by using a ohms meter by unpplugging it and check ohm's or resistance when cold and then start engine as the engine warms up the ohm's reading should gradually lower as the sensor is a thermister and as it warms up the resistance will drop.
Posted on Jun 05, 2010
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