Question about 2004 Nissan Altima

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My car is not heating properly lately. It blows warm and then completely cold while I'm driving it. I put coolant in just now and it blew very warm for about 5 min. then it turned to cold completely.

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If your engine has a leak in the coolant system as long you keep it full heater will work, if there is no leak in coolant system and your heater blows warm and then you start driving and then starts to blowing cold you have a clogged heater core..

Posted on Nov 25, 2013

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6ya6ya
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Posted on Jan 02, 2017

fwadley
  • 482 Answers

SOURCE: airconditioner suddenly stopped blowing cold air while I was driving--blows warm air now

you can get a recharge kit at Auto Zone, the car has to be runnung to fill it. . This is the first thing I would do, to see if it's out of freeon first.

Ask the Auto zone man to come out side and help you refill it. They will help if you ask.

Posted on Nov 06, 2008

  • 55 Answers

SOURCE: heating system in 2002 nissan altima completely gone out

Change the thermostat

Posted on Dec 15, 2008

greg_margo
  • 1959 Answers

SOURCE: My 99 dodge durango's a/c is blowing out hot air

Most likely cause is a leak in the AC system. Adding refrigerant alone won't cure your problem. Get a can of R-134A with leak detector in it. It has a UV dye that will glow wherever the system is leaking. Best of luck.
Greg

Posted on Jul 02, 2009

  • 108 Answers

SOURCE: No interior heat until I start to drive

You most likely have an "AIR LOCK" within the Heater Core. This requires one to pressurize the Cooling System and loosen the heater hose at the HIGHEST POINT and bleed the Air out of the Heater Core. I am not familiar with the Nissan but have encountered this problem numerous times over the years. Most late model vehicles are equipped with Air Bleed devices which must be utilized any time coolant is drained and refilled.

Most all reputable Auto Parts stores sell and/or rent a pump that temporarily replaces the Pressure Cap that may be utilized to pressurize the system for this purpose. If you don't feel capable of performing the bleeding operation take your vehicle to an ASE Certified Mechanic and have it done correctly.

Posted on Dec 07, 2009

Testimonial: "Great advice. That's what I thought it might be, but I wanted someone else's opinion on the matter. Thanks a lot."

jturcotte
  • 7762 Answers

SOURCE: 2005 sentra 1.8 no heat...

Hi, the likely problem is a bubble forming in the system, possibly due to a head gasket failure.

Try stopping on a steep incline--does the heater stay warm? If yes, what you have is an air bubble that hangs at the heater hose until pressure from the water pump blows thru it as the engine speeds up. Park on an incline, open the radiator cap, run the engine until the thermostat is open, turn the heater on, crack open any/all bleed ports to release any trapped air, and fill the radiator to the neck. Wait until the level stops dropping and make sure bubbles don't continue to come up. If they do, you may have a blown head gasket that will keep forming these bubbles until you change the gasket.

Posted on Jan 11, 2011

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Coolant is too low. Coolant was not properly refilled, so there are large air pockets in engine head. DO NOT DRIVE until proper purging and correct coolant quantity and level are established.

To completely refill the system, you need to get the heater core full of coolant (the refilling has to be done with the heater on m?ximum, so to allow coolant to enter and fill heater core. Tha is the reason you don't get hot air. Amclaussen.

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There may not be enough coolant in the system. What happends is the heating core is nothing more than a small radiator inside the car. If the fluid is low the heating core is empty. But once you start driving the water pump works harder and fills it up. Another possible cause is a sticking thermostat. If its stuck open the engine cant retain water to heat it up. Thus blowing cold air. Whith the engine cold remove the radiator cap and check your coolant level. If it is full a replacement thermostat may be needed. HTH and dont forget to rate.

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