Question about 1999 Nissan Quest

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Weak heat at best

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.

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  • 887 Answers

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

  • 2 Answers

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

woodchuck789
  • 4059 Answers

SOURCE: I have an 1996 Nissan Sentra GXE i live in ND and

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

danglin_dan
  • 118 Answers

SOURCE: not enough coolant getting to heater core

make sure when you put in fluid that you burp heater core might be air in it.

Posted on Jan 16, 2012

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1999 F250 Super Duty with a V10 only blows warm air. 30k miles on engine. Coolant level fine, no leaks. Air Blend Actuator moves. Temp in to heater core is 115F, out is 105F


That's not hot enough at the heater core. Engine coolant temp is controlled by your thermostat. It is probably weak or stuck. Replace it. don-ohio (:^)

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check to make sure your cooling fan isn't running constantly, also if your temp gauge says the engine is hot but the heat isn't you have a flow problem. maybe water pump or a clogged/ crimped hose. if your gauge isn't very hot then put some cardboard infront of the grill.

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Check the vacuum lines to make sure they are correctly connected and in good shape. If they are not, then the system wont move the dampers to allow hot air into the heat vents. A second possibility is a clogged heater core, which is not allowing hot water to circulate through it. As you say the head has been replaced, I would have someone insure every thing was reconnected correctly. It could be the hoses to the heater core are reversed!

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I have a 1999 nissan quest when I turn on the heat smoke fills the van, what's wrong? Please help.


does the smoke have a sweet antifreeze odor to it?if so unfotunately your heater core is most likely leaking.

Feb 05, 2011 | 1999 Nissan Quest

1 Answer

No heat


Hello,

If your car is not blowing heat, then it means there is a problem somewhere.
There are several causes of such problem like, low coolant level, open thermostat or the one that is too cold for the application, a defective heater control valve, plugged heater core, an ioperative airflow control or inlet door in the heater ducting or plenum, a defective blower motor, a pinched or kinked heater hose or a weak water pump.

Any of this might be the cause to the problem. Have a mechanic run a check on the car to know which is the fault, then I will be able to provide the step by step solution to the problem.

Take care and good luck.
I hope this solution was helpful

Dec 07, 2010 | 1999 Ford Taurus

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Heatere core replacement


Be careful you dont over heat soon. I posted this in a different web sight I hope it helps you.

Re: Overheating and blowing cold air
I have been a mechanic for 20 years. Your problem is the heater core is plugged. The cold water from the radiator blows directly at the thermostat keeping it closed even when you are overheating! BAD DESIGN!! If you look at the water flow charts in AllData you will understand. If you rev the motor to 3,000 rpm's the turbulent HOT water at the water pump impeller (near the thermostat) will reach the thermostat to open it and the car's temp will fall very fast to the correct temperature. If you remove the thermostat it will not overheat but will run way to cold. If you bypass (loop) the heater core it will not over heat.

The hot water that leaves the heater core returns to the engine at the thermostat. It is the only hot water introduced to the thermostat to keep it open and allow the water to flow from and to the radiator. I normally just back wash the heater core and get large chunks of rust flake out then its fixed. Back wash then froward wash repeatedly many times. Also flush out the motor so you don't re plug the heater core. I hope you have now blown the head gaskets or cracked a head yet. Make sure to run the proper coolant in the car so you don't promote more rust flakes. And bleed the air out as mentioned in detail by other posters.

Nobody knows this little secret. Not even Subaru mechanics at the dealer, no TSB (Technical Service Bulletins a special note after the fact to mechanics). After days and days of trouble shooting a 1993 Subaru Impreza (2.0?) I looked at the water flow chart and then it was clear what was happening. This phantom overheating problem stumps the best mechanics and sends many Subarus to the crusher.

Dec 11, 2009 | 1990 Subaru Legacy

1 Answer

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try replacing the heating core mine is the same way and that is what's wrong with it

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1 Answer

The heat is not working properly


Did you check to see if the heater core is stopped up?

Dec 20, 2008 | 2001 Nissan Quest

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