Question about 1999 Dodge Ram

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Fresh air goes hot by its self

When using air or fresh air the temp goes from cool to hot by its self the temp is set on blue

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You may need to add freon to your system it may be low or even have a leak have it checked out

Posted on Dec 08, 2008

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Blend door closing to hot on heat side....vacuum line check valve failure or signal from ac/heater control unit wigging

Posted on Dec 08, 2008

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2003 chrysler town and coy try, temp gauge goes up and heater gets warm when idling, but as we drive the temp gauge goes way down and heater blows cool air. Any suggestions?


1. Engine Coolant Temperature.
If the thermostat in the cooling system is getting stuck in the open or partially open position rather than opening and closing as needed to keep the coolant at the required operating temperature then you will get the results you have described here with the coolant temp dropping as you drive. The radiator is providing optimum cooling when the car is moving and there is plenty of cold air flow through it.
I am assuming the temp gauge in the vehicle is reading correctly.

Thermostats in the cooling system do become faulty in time and it may well never have been changed (or only changed once) since the car was built and is possibly gummed up with debris. With those symptoms I would definitely change the thermostat. Make sure a full flush of the cooling system is done at the same time and refilled with fresh coolant.

2. In Car Heater.
I would not worry about the interior heating until you change the thermostat on the cooling system. However if you continue to get cold air from the heater then there will be an issue with hot coolant from the cooling system being restricted in flowing through the heater core.

Feb 22, 2016 | Chrysler Cars & Trucks

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.

on Feb 14, 2011 | Toyota Pickup Cars & Trucks

2 Answers

Heater not blowing hot air


Yup, flush the coolant ayatemavoid using Barsaleak type leak treatments for leaks. They are notorious for clogging up.heater. cores.
a fresh air actuator door can also get stuck open allowing cold fresh air which in wintertime feels like no hot air at all. I think this door is actuated by vacuum hose.

Oct 21, 2014 | Dodge Caravan Cars & Trucks

1 Answer

The fan wont work car does not get hot shut off


cooling fan works on a temp sensor in the engine block. it only turns on when the temp reaches a set limit and shuts off when it gets below a set limit.. cooling fan components are , fans, fan relay , and temp sensor . best way to test the fans would be to let the car set running and watch the temp till it goes up to 185 -195 deg. at this time the fans should turn on and the thermostat should open and cool the engine back down. also when ever the air conditioning is on so should the cooling fans be on. if the fans do not run the check all components till you find the broken one. fan relay and air conditioning relay are separate but work the same. and will interchange

Dec 18, 2013 | 2001 Dodge Neon

1 Answer

My 1999 Chevy Malibu runs hot? It started when it overheated. We changed the thermostat, then water pump, then temp sensor gauge and the temp gauge goes high but only when the heater stops blowing hot...


Air pockets will make the guage do that, and also cause your heat to come and go. Also, a poor radiator, as in rotting, or plugged up, will cause high temperature issues.

Sep 20, 2011 | 1999 Chevrolet Malibu

1 Answer

Hot air only, no fresh air or ac air. no engine overheating.


Your hot air keeps coming since the louver get stuck due to mechanism failure inside the ducting console. It usually is controlled by temperature setting. When the setting has no effect then the engagement is loose. Nee to open the dash vent to check out.

Jun 25, 2010 | 2002 Toyota Tacoma

2 Answers

Heater valve was replaced..Now Engine temp rises


WELL IT SOUNDS LIKE YOU HAVE AIR POCKET VERY COMEN IF YOU DID THE WORK YOUR SELF SOME SHOP USE AIR LIFT TO GET AIR OUT OF SYSTEM BE FOR FILLING ANY WAY YOU MAY TRY THIS WHEN CAR COOL TAKE RAD CAP OFF START CAR LET GET WARM BE CARFULL NOT TO GET BERNT BUY COOLANT LET GET HOT NOT OVER HOT THEN TRUN CAR OFF LET COOL DOWEN THEN TOP OFF COOLANT TO SEE IF YOU GOT RID OF AIR POCKET YOU MAY NEED TO JACK THE FRONT END UP AS HI AS YOU CAN THIS HELPS TO WHEN YOU DO THIS HOPE THIS HELPS

Aug 19, 2009 | 2001 BMW 325

2 Answers

Only hot air blows out vent when switch is in cold or blue area even when ac is on


Could also be that you are out of Freon, Compress may have a leak. Try it on cold setting in the early morning if its not even cool and heats up fast then Rob is correct. ITs a damper/ temp problem which is eternal. You can tear apart you dash and check on the damper (looks like a doggie door) make sure nothing is in the way and the hinger isnt broken.....I hope you can fix it yourself..

May 13, 2009 | 2002 Nissan Maxima

1 Answer

CAR DIES AFTER ONLY A LITTLE WHILE OF DRIVING. CAR WILL RESTART AFTER AWHILE. MECHANIC SAID CODE SHOWED CLEAN AIR SENSOR.


hello

sounds like when you drive for a while the car gets to op. temp then shuts down? sounds like the crank position sensor. the sensor will get hot and break connection in side of the sensor when it cools the connection is made then the car will start. If your an do it yourself guy you can check the connection your self you need to remove the sensor.And using a volt/ohm meter set on ohms connect the leads to the sensor wires you should have a reading then heat the sensor with a heat gun hair drier may not get hot enough watching the the ohm meter when the meter goes to zero or open the sensor will not start the car let cool with meter still connected watch if reading comes back if so you need to replace the sensor hope this helps

workitover

Aug 02, 2008 | Subaru Forester Cars & Trucks

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