Question about 1999 Nissan Quest
I have a 1999 Nissan Quest and have very weak heat. I have replaced the thermostat and heater core. My mechanic is stumped and I am frustrated. I live in MI and it's too cold for this to be happening. Heat seems to heat up a bit (guage gets to warm)and in a short amount of time the heat from the blower goes to cool. The warm seems to be a little better with the blower not on high but, still not enough heat to keep the windshield from freezing up.
You may have a problem with the heater core flap that allows coolant into the core. seems like there is just not enougg coolant going through the core. check to make sure the heat/cool selector is working properly.
Posted on Jan 03, 2014
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Posted on Jan 02, 2017
SOURCE: heater blowing cold air
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!
Posted on Oct 16, 2009
Sounds like it's the air control flap which determines the mix of heated and fresh air. This could be vacuum controlled or manually with a cable.
Posted on Jan 10, 2011
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