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Fan and temperature controls stop working - 2005 GMC Sierra

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COULD BE THE HVAC FUSE BLOWN.OR FAULTY BLOWER MOTOR OR FAULTY HVAC SWITCH.

Posted on May 03, 2010

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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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I have a 1999 cadillac deville. My cooling fan is not turning on. My car is over heating. Is there a connection?


There is nothing really in the water-related part of the system that has anything to do with the fan. The hoses, thermostat, heater core, etc. are simply a conduit to move the water through the engine to provide cooling. The fan is the crucial element to avoiding overheating. While the car is in motion, air flows through the radiator, cooling the coolant down and removing the excess heat. Once you stop, however, or get in a stop-and-go environment, there is limited airflow through the radiator to provide this heat reduction. That is where the fan comes into play. What makes the fan work depends upon what you are asking the vehicle to do. Testing the fan circuitry is rather simple if you understand a few things. The fan only needs to run to cool the engine if the engine coolant gets above a certain temperature (usually about 220F). The fan will be ordered on and run until the coolant drops to about 180-190 (thermostat temp). The confusion is that the thermostat has something to do with turning the fan on. The thermostat only controls the flow of water through the system. It stays closed until the water temp reaches it setpoint (usually 180-190F), then open to allow water to flow through the engine. There is a coolant temperature sensor, usually installed near the point where the thermostat is, and it sends coolant temperature information to the ECM. The ECM uses this information to control fuel-air mixture and to control the cooling fan to operate when needed. The fan and the fan relay can be tested very easily by simply turning on the car's A/C. Even if your A/C unit isn't working, simply putting the dash controls to an A/C position, will automatically power up the cooling fans, since the A/C requires CONSTANT airflow thru the font of the engine to maintain cooling. If the fans don't work in the A/C position, then the problem is not likely to be the coolant temperature sensor. It is more likely to be a fan relay or the fan itself.

Oct 21, 2016 | 1999 Cadillac DeVille

1 Answer

2005 montana sv6 rear blower does not work, used to but then just stopped... front works fine


Need to verify if you have power going to the fan first if not it may be temperature control module in the rear of vehicle utube can actually walk you thru that process step by step if the fan is digital its control module if fan is a brush motor it may be fan motor
First verify you have power

If you need further help, I’m available over the phone at https://www.6ya.com/expert/robert_c7b5aba9012a13b2

Nov 12, 2014 | Cars & Trucks

1 Answer

Why does cabin fan stop


The vehicle is equipped with Automatic Temperature Control, which automatically controls fan speed based upon cabin temperature. Check your user manual for proper operation of the system before proceeding further.
If your fan is stopping before achieving the temperature you set, suspect overheating of the fan relay, a defective fan resistor, or a bad ATC.

Aug 02, 2014 | 2009 Lincoln MKZ

1 Answer

1997 buick skylark temperature sensor location


the radiator fan gets the power from a relay that is energized by a signal from the ECM that in turn gets a report from the coolant temperature sensor
AT this point I would be thinking that there is considerable resistance in the relay
you say the fan works a bit so the temp sensor is reporting toe the ECM which is turning the relay on but power is low from there
replace the fan relay and see if the situation improves
you can test that theory by putting a meter across the wires to the fan when it should be working and reading the voltage available to the fan
if it is not 12 volts or better( 13.2-14 volts) it is the relay

Mar 13, 2017 | Cars & Trucks

1 Answer

Fan sensor is not working.


You need to change the relay and the temp sensor switch. If you have done that the reason it's not coming on is probably because the coolant is not getting hot enough to cause it to come on. Let me explain. The coolant fan when the A/C is off is activated by the coolant fan switch. The switch closes when coolant temperature is over 238F completing a path to ground through the coolant fan relay windings. The relay contacts then close and voltage is applied to the coolant fan. When the coolant temperature drops to 214F, the switch opens and the coolant fan stops. In A/C equipped vehicles, the A/C control head completes a path to ground for the coolant fan relay whenever the A/C is on no matter what the temperature. Voltage is then applied to the coolant fan. Essentially, the coolant fan switch is by-passed when the A/C is on, which is why the fan works whenever you turn the A/C on. Now, if the fan does not kick in when the coolant temperature is over 238F but works when the A/C is on, the problem has to be the coolant fan switch or the connectors or wiring to the CFS.

Jul 03, 2012 | 1998 Chevrolet Cavalier

2 Answers

The AC on my 2002 chevy S 10 just suddenly stopped blowing cold air. The freon is full and the compressor is coming on. Any advice would be helpful in this Texas heat. Thanks


If the freon is full and the compressor clutch is working,is the blower working, need more details, if it is, you could have a blocked orifice filter. or a bad high pressure switch located at the rear of the compressor.if the high pressure switch loses voltage or goes out, your cool air will come to a dead halt. check the high pressure switch for voltage. good luck!

Aug 08, 2011 | 2002 Chevrolet TrailBlazer

1 Answer

The temperature control does not change when the fan is turned up. if i want to change the temperature from hot to cold, i have to turn down the fan, listen for the switch in the dash and then turn the...


I can tell you about my experience on my 1999 F150. I do not believe it is the blower control switch because mine went out and only affected the fan speed. On my truck, in an incident like yours, I could not get a good response from the temperature switch.

I would turn the control and it would hit a stop on both ends, but the temperature would not change to match the switch. What I found is the stem of the temperature control did not turn because the knob cracked behind the switch. There is a half-moon shaped metal clip inside the plastic temperature knob. The clip can spin when the knob is cracked and nothing moves right.

Because the plastic knob has molded stops under the knob, from the drivers point of view, the knob was turning lock to lock. In reality, the stem was not turning. Try taking the knob off and turning the stem with pliers wrapped in cloth to protect the plastic. Then see if the temperature changes.

Jun 30, 2011 | 1998 Ford F150 Regular Cab

1 Answer

We have a 2004 X5 diesel , fan won't turn off even after key removed, have taken out 50amp fuse to stop it ! would apreciate a solution please


In these models the temperature control works till the normal temperature comes to the engine. So if there is failure of the temperature control sensors- Thermistor- or if there is fault on the temperature controller unit , the fan will be made to work on till the controller deactivates.
So you need to check for the input- temperature sensor, check any wires that had come off the sensor or the unit, check if the fan control contactor/relay has failed or jammed on contact.( relay).
Try and trace these lines , check the action of the relay when the fuse is put on, if you hear the relay clicking then it works and the control circuit can be the suspect.

Apr 15, 2011 | 2003 BMW 5 Series

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