Car just stopped blowing hot air then about 5 mins later temp gauge flashing as its over heated. no smoke no leaks oil ok maybe a little high but only just. rad fan working ok resiovour is just above min but feels luke warm not hot but no room in engine bay to play with pipes etc to see if there hot or cold. any ideas what could be causing this please cheers
If it is blowing cold air, that means the coolant level is low, the heater core has no coolant in it. Sounds like a head gasket is leaking.
SOURCE: heater on 99 QX4 does not heat adequately
The Heater control valve that mounted on the fire wall may be at fault some what common on Nissan vehicle. Open valve manually with the lever on top if you get heat replace vale but first chech vaccum house connected to valve for vaccum. Good Luck
SOURCE: heater does not blow hot air on full heat setting
the problem is caused by the motor that operates the air temp blend door motor in the heating ducts, it blends air between AC and heater core tro give desired outlet temp.
SOURCE: Air, no heat '98 Astro. No leaks, engine
It sounds to me that you may have 2 problems. 1). Air Lock in the Heater Core. 2). Inactive Heat Damper in the Plenum.
But since you state that the Heater Hoses do not get warm that is indicative of an Air Lock in the Heater Core. This is a relatively simple fix. It is best performed COLD but requires a method of pressurizing the Cooling System. All reputable Auto Parts stores Sell and/or Rent Pumps that temporarily replace the Radiator Pressure Cap for Leak tests and curing Air Lock. The Collant Level must be filled FULL then pressurized and then loosening the Highest Heater Hose at the Firewall so that Air and a Small Amount of Coolant escapes. Once all the Air has escaped tighten the Heater Hose Clamp, remove the Pressure Pump, Restore the Collant Level to FULL, re-install the Pressure Cap and Start the Engine. As it Warms up you should be able to feel coolant running through the Heater Hoses and they should become warm.
SOURCE: 2003 Protege 5 overheating on long runs.
I just replaced the radiator and thermostat on my 03. The radiator was defective (corroded) on the lip where the cap seals. This allowed coolant to be spat out. The thermostat was also sticking closed after new radiator and this caused overheating. Replace both while in there for under $100 if doing it yourself.
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