Question about 2003 Nissan Sentra

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2003 nissan sentra is blowing cold air i changed thermostat stillblowing cold air i did notice that heater core hoses are both cold car is not overheating

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Remove both hoses from engine that passes through firewall to heater. put a stiff piece of wire in the hole and make sure it is clear. If there is no restriction, then the heater is choked up

Posted on Feb 02, 2013

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Posted on Jan 02, 2017

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youredone82
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SOURCE: 2003 NISSAN SENTRA HEATER BLOWING AMBIENT AIR.

let the engine get cold, and remove the radiator cap, fill the system to proper level and re test. run engine until thermostat opens, fans come on, then alow to cool again and re check engine coolant. If this does not work, or the thermostat does not open the thermostat is instaled backwards, remove and reposition.

Posted on Nov 17, 2009

  • 67 Answers

SOURCE: 2003 Nissan sentra 2003 gxe, had 4 yrs, no

Start the car up when it is cold and rev the engine up for 30 seconds,loosen up the radiator cap and see if there is pressure there..If there is you probably have a bad head gasket...Caution do not open cap if engine is warm...

Posted on Mar 01, 2010

alicantecoli
  • 22326 Answers

SOURCE: 2003 nissan sentra gx 1.8

either the heater core needs a good flush or their is a tap/valve just inside the car up under the dash normally drivers side ,and the cable has come off the lever or it could have a electric solonoid to open the valve ?' depends on where it was built and for what market as some vehicles do have small variations

Posted on Dec 12, 2010

pal03246
  • 726 Answers

SOURCE: I have a 2002 Nissan

you may have a problem with heater box. your air/mix door may have an issue. feel the knobs on the control unit. if the cold/heat know feels kinda funny from the other knobs, then thare is a problem with heater box/cables??

Posted on Sep 10, 2011

  • 93 Answers

SOURCE: 2005 nissan sentra 1.8 overheats and heater blows hot air in park but when put in drive it blows cold air have repalce the thermostat

Might try a reverse flush of the cooling system. Might reverse flush the heater core too.

Posted on Jan 15, 2013

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Check the heater hose's going in through the fire wall ,are they hot ? Both hose's ! This is something you can do yourself ! If they are hot probably the temp actuator is bad or the door is stuck on the cold or heater core clogged ! Video's on youtube showing what to check. Learn to double check your mechanic !
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My 2005 Nissan Sentra 1.8s with 55,000 mi. blows cold air from the heater. Coolant not circulating in engine. Lower hose stays cool to touch. Both heater hoses cold. Changed thermostat - didn't fix it. Coolant not leaking or dirty. None in oil - no oil in radiator. Changed worn water pump belt - pump spins freely with no noise or resistance. Cooling fans come on after warm-up. Temperature gauge stays in normal range then jumps to hot and back again. Coolant good to 10 below - didn't freeze here yet. No other problems or repairs to car. Afraid to drive and make worse. Help!

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