Question about 1996 Nissan Sentra

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When the car moves temperature drops to zero and heater gets cold

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While engine is cold remove the radiator cap and fill the engine with antifreeze, if it's low you most likely have a bad hose from the puke tank (Recovery tank ) tothe radiator.

Posted on Jun 19, 2009

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Posted on Jan 02, 2017

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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.

Aug 31, 2015 | GMC Cars & Trucks

1 Answer

1999 Lincoln Continental heater blows cold air while driving


Sounds like your thermostat may be stuck open. When the wind moves in front of your car, it chills the Radiator and drops the temperature. All the other settings for Heat, like ductwork and waterflow are in the same positions sitting as moving.

Dec 31, 2013 | 1999 Lincoln Continental

1 Answer

My engine temperature gauge reads hot but heating system is not working. Outside temperature is below zero


It is possible that somehow your heater core is either blocked or airlocked. Best thing to do is to feel the two hoses that go to and from the heater core when the engine is up to normal operating temperature. If one hose is hot and the other is barely warm than you have a blocked up heater core. If you feel both hoses and they are barely warm than it is possible that you have an airlock in the system. The airlock is mostly likely to occur if you have recently had your heating system worked on such as a new radiator, thermastat, etc. If both hoses are hot then it could possibly be the heater blend doors inside the heater box could be stuck in the cold position. They are controlled from the switches on the dash. When you adjust the heat setting on the dial from hot to cold or cold to hot it moves the blend doors to either let more cold air in or more heat in. Hope this was helpful. Happy motoring.

Dec 28, 2010 | 2006 Ford Explorer

1 Answer

Heat won't work when moving.


sounds like the thermostat has a problem and needs to be replaced. The thermostat regulates temp and it defective can either stay closed or stay open and I reckon in your case it has stuck open permanently.
Your manual should show you where the thermostat is located.

Jan 06, 2010 | 1998 Plymouth Breeze

2 Answers

Heater not working it is blowing cold air at all times is there a


Heater blowing cold air until I get on the interstate, then it works; however, when I stop at lights it starts blowing cold air again. The temperature gauge will be in the middle but the car will still be cold until the car starts moving.

Nov 14, 2009 | 2002 Jaguar X-Type

2 Answers

2000 Nissan Altima temperature gauge and heater problem


sounds like you need to replace the thermostat.

Jan 29, 2009 | 2002 Nissan Altima

1 Answer

No heat when car not moving


Ok, judging from what you've said it sounds like a vacuum issue. The temperature controls are activated by vacuum which is produced by the engine. Look for small hoses that lead from the intake manifold to the firewall, check them and make sure they are not broken, disconnected, or leaking.  The vacuum directly controls the doors inside your dashboard which push the air to the heater core. Also make sure that the coolant hoses going to and from the firewall are hot.  If all that checks out, then the controls inside the car may have gone bad, or may have become disconnected from the vacuum supply, or the actuator door inside the dash is stuck or broken.

Dec 22, 2008 | 2002 Jeep Liberty

1 Answer

Heater problem


sounds like you don't have enough coolant flowing into your heater core. Check coolant level in radiator and overfolw bottle.

Or, you have your temperature blend door stuck in the cold or partail cold position. Could be a bad blend door motor or heater cntrols head.

Dec 14, 2008 | 2002 Ford Windstar Cargo

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