2006 Nissan Frontier Logo
Posted on Feb 09, 2010
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There is no heat in my truck. I have the

There is no heat in my truck. I have the temperature set to full heat, the fan on full setting, 4 and the defrost setting-but no heat, only cool air. I cleared all the ice and snow from the windshield wipers and vent.

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  • Nissan Master 3,640 Answers
  • Posted on Feb 09, 2010
Anonymous
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Joined: Jun 01, 2009
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Make sure coolant is at proper level. if ok change thermostat. if the thermostat sticks it will make hot coolant go through bypass hose at thermostat, and therefore no heat. if that does not help much try bleeding air from coolant system.

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0helpful
1answer

I have a 2002 Citroen C5 the motor still runs at full all the time

When the Automatic Climate Control is set, you are no longer in control of settings and fan speeds. The sensors make the unit run at full speed and don't power down until the set temperature is reached. If you have the temperature set to 18'C (Max Cold), it is likely to never achieve that. If you want to take control back, you need to take it from Auto, to Manual. If it still does it, you need to go to an auto electrician who will use a pro grade scan tool to check on communications to the Body Control Module and the sensors controlling AC, Heating, and Fan Speeds.

This is the Owner Manual covering Climate Control

https://www.manualslib.com/manual/397817/Citroen-C5.html?page=105

This is a technical manual on the D-Series explaining AC, I just found it interesting.

https://www.manualslib.com/manual/1061220/Citroen-Ds-Series.html?page=50#manual

..
tip

Tips for operating Air conditioning system on Toyota Hilux and someother...

To cool off your Toyota after it has been parked in the hot sun, drive with the windows open for a few minutes. This vents the hot air, allowing the air conditioning to cool the interior more quickly.

Make sure the air intake grilles in front of the windshield are not blocked (by leaves or snow, for example).

On humid, do not blow cold air on the windshield. The windshield could fog up because of the difference in air temperature on the inside and outside of the windshield.

Keep the area under the front seats clear to allow air to circulate throughout the vehicle.

On cold days, set the fan speed to high for a minute to help clear the intake ducts of snow or moisture. This can reduce the amount of fogging on the windows.

When driving on dusty roads, close all windows. If dust thrown up b the vehicle is still drawn into the vehicle after closing the windows, it is recommended that the in intake be set to FRESH and the fan speed to any setting except "OFF".

If following another vehicle on a dusty road, or driving in windy and dusty conditions, it is recommended that the air intake be temporarily set to RECIRCULATE, which will close off the outside passage and prevent outside air and dust from entering the vehicle interior.

HEATING

For best results, set controls to;
Fan speed ---- Any setting except "OFF"
Temperature----Towards WARM (red zone)
Air intake ---- FRESH (outside air)
Air flow ---- FLOOR
Air conditioning ---- OFF

For quick heating, select recirculated air for a few minutes. To keep the windows from fogging, select fresh after the vehicle has been warmed.

Press the "A/C" button on for dehumidified heating.

Choose floor/windshield air flow to heat the voltage interior while defrosting or defogging the windshield.

AIR CONDITIONING

For best results, set controls to;

Fan speed --- Any setting except 'OFF"
Temperature --- Towards COLD (blue zone)
Air intake --- (outside air)
Air flow --- PANEL
Air conditioning --- ON

For quick cooling, move the air intake selector to recirculate for a few minutes.

VENTILATION

For best results, set controls to;

Fan speed --- Any setting except 'OFF"
Temperature --- Towards COLD (blue zone)
Air intake --- (outside air)
Air flow --- PANEL
Air conditioning --- ON

DEFOGGING

The inside of the windshield

For best results, set controls to:

Fan speed --- Any setting except 'OFF"
Temperature --- Towards WARM (red zone) to heat; COLD (blue zone) to cool
Air intake --- FRESH (outside air)
Air flow --- WINDSHIELD
Air conditioning --- ON

The outside of the windshield

For best results, set controls to:

Fan speed --- Any setting except 'OFF"
Temperature --- Towards WARM (red zone)
Air intake --- FRESH (outside air)
Air flow --- WINDSHIELD
Air conditioning --- OFF

On humid days, do not blow cold air on the windshield. The windshield could fog up because of the difference in air temperature on the inside and outside of the windshield.

DEFROSTING

The outside of the windshield

For best results, set controls to:

Fan speed --- Any setting except 'OFF"
Temperature --- Towards WARM (red zone)
Air intake --- FRESH (outside air)
Air flow --- WINDSHIELD
Air conditioning --- OFF

To heat the vehicle interior while defrosting the windshield, choose floor/windshield air flow.
0helpful
1answer

Heater is on high all the time, 2009 grand marquis.

Is your fan blowing on high at any other temperature or is it only the heat that is blowing on the highest setting?

If your heat is on the highest setting at all times, with no way to lower the temperature, it could be a problem with the climate control in your HVAC unit. Sometimes they fail and need to be replaced.

Now, if that isn't the problem, and your fan is blowing only on the highest setting, there's most likely a problem with your "blower motor resistor."

When they fail, they can't regulate the voltage coming from the battery, so they're using the full amount of battery voltage to power the fan, causing it to blow on high. These can be tested by a mechanic for failure, but they're relatively easy to replace without a mechanic if you're inclined to do so.

Usually located under the passenger side dash, in or under the glove compartment.
1helpful
1answer

I have a 2002 Ford Explorer Sport no heat but the fan works,what could the problem be?

Could be that the thermostat has packed up...

Check all your coolant levels are correct and then take her for a good run out....keep your eyes on the temperature gauge,,if your temp gauge hardly moves then your thermostat is at fault....replace it.

If temp gauge works fine, you may be airlocked in your heater matrix... Try setting heater to full heat with fan on full power,, whilst car is ticking over, remove radiator / expansion bottle cap carefully and start squeezing your coolant pipes. This should force any air out through your rad/bottle top..

Please be aware that as your temperature rises in the engine. Your coolant will expand and start to flow out of the rad/expansion bottle..at this stage quickly replace the cap....check your heater...leave engine to cool....unscrew rad/bottle cap, check coolant levels, top up if necessary and squeeze pipes again..start car with heater/fan on full and repeat above.....

Hope this helps..
0helpful
1answer

What is difference between on an auto on thermostate

I'm not sure exactly how this applies specifically in a car, but on a home heating and cooling (air conditioning) thermostat, it is often associated with the fan or blower setting.

If for a system fan:

"Auto On" setting in a heating / cooling system would start the fan when the temperature climbed above or dropped below the setting you on the thermostat and start the heat or cooling source. Once the thermometer indicates the desired temperature had been reached, the heating / cooling source would be stopped and the fan would turn off.

"On" would run the fan all the time, regardless if the thermostat tired to start the heat or cooling source. This would result in constant circulation of the air in the space(s) and tend to keep warm or cool spots (rooms) from being created.
25986675-yg02wefbryhylvrzhsbt44nn-2-0.jpg
0helpful
1answer

My 1998 gmc jimmy slt has a heating problem. The heater wont turn off. As long as the car is on the heater is on full blast. The fans work and everything knob wise works but the heater is always on.

The air temperature valve electronic actuator positions the temperature door according to the temperature setting of the temperature control on the temperature control knob. For the full COLD temperature setting, the temperature control returns approximately 12 volts to the air temperature valve electric actuator. When the temperature setting is changed to full HOT, the temperature door is moved to the warm position and the output drops to about 0 volts. For a temperature setting in the mid range, the temperature door is positioned according to the voltage supplied through the temperature control switch.
Temperature Control Inoperative

2

Inspect the HVAC I fuse 21.
Is the fuse open?
--
Go to Step 20
Go to Step 3

3

  1. Disconnect the air temperature valve sensor.
  2. Turn the ignition switch to the RUN position.
  3. Move the headlamp switch to the PARK position.
  4. Using the J 35616-A , connect a J 39200 Digital Multimeter (DMM) between cavity 8 (CKT 733) of the air temperature valve motor connector and ground.
  5. Move the temperature control knob from the HOT position to the COLD position.
Does the voltage vary smoothly and continuously within the specified range?
0-12 V
Go to Step 4
Go to Step 9

4

Using the J 35616-A , connect a J 39200 DMM between cavity 10 (CKT 341) of the air temperature valve motor connector and ground.
Does the voltage equal the specified value?
B+
Go to Step 5
Go to Step 7

5

Using the J 35616-A , connect a J 39200 DMM between cavity 10 (CKT 341) and cavity 7 (CKT 1850) of the air temperature valve motor connector.
Does the voltage equal the specified value?
B+
Go to Step 6
Go to Step 8

6

Replace the air temperature valve motor.
0helpful
1answer

1984 f150 straight 6 300 overheating problems

-Check water. If it's low add more.
-If water is full then the thermostat is not open when temperature reach above its setting.
-Test the thermostat . If it's not working then replace new one.
-If it's working (Start to open when temperature reach about 185 and up) Then now you need to check the cooling fan sensor. If the thermostat is open but the cooling fan sensor not work and kick the fan than it'll be over heat too.

Good luck


Mai
1helpful
1answer

2000 Pontiac Grand AM little heat being produced.

1st thing to do is change the thermostat. It is either missing, or stuck open (you provide good info). This is why the car is not running at operating temp and why you have little heat. The no blower for settings 1-4 probably means a bad switch.
0helpful
1answer

Heater problem

hello dan, do you have an i-drive in your car. if so take a look at your climate settings and make sure the settings in the i-drive are not set to full cold (4 blue bars). The settings of 4 blue bars can make up to a 40 degree difference in distribution temperature. Just the same if you adjust the bars to 4 red bars.
0helpful
1answer

Fan works on Full Setting ONLY. 98 pathfinder

there is a ballast resistor that should be next to the blower motor that controls the low speeds on the blower. change it and you should be all set.
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