Question about 1999 Nissan Quest

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Heater low heat

Luke warm heat. Have replaced thermostat and heater core. My mechanic is stumped at this point and I'm out of money..LOL It's really cold here in MI and this low heat is killing me. I can't take long drives if roads are wet or it's snowing because windshield isn't being kept warm enough to prevent freezing. Blower works on all speeds but, heat seems slightly better when set on "less" than highest setting. Heat drops considerably after engine has been on for 5 minutes or so.

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  • 887 Answers

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.

Posted on Jan 03, 2014

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Posted on Jan 02, 2017

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SOURCE: Replace thermostat. Engine temperature gauge

(2 people is easiest) one old school way to get 'hotter' heat is when your vehicle is cold, take off radiator cap. start vehicle. keep motor revved at 2500rpm, other person pouring water/radiator fluid SLOWLY till full. driver puts motor to 3k rpms, other guy tops off radiator, and quickly cap it. this completely fills your radiator lines, and heater core. SHOULD be done in less than 3 minutes. Also, keep an eye on the water pump...if it looks 'greasy' (not like black oil/soot), tighten the hell out of those bolts.

if this doesnt fix the heat, then thermostat-follow large lower radiator hose to engine block. 3 bolts-u found it. make sure to have a catch can underneath as you will have a couple gallons of coolant gush out.

unbolt, yank out old thermo, scrape metal clean, put new gasket/thermo on (i prefer cork gasket), rebolt, repeat the above section with the 2 people.

IF this doesnt work, u have issues that are better seen to fix...

Posted on Feb 09, 2012

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

  • 27 Answers

SOURCE: The heater does not maintain

This is a problem with air in the cooling system, i.e. there is not a continuous flow of hot water through the heater core because of air in the cooling system. For whatever reasons, based on the cooling system design I suppose, at low RPMs the hot water doesn't circulate into the heater core, thus cold air at low RPM.

The solution is to open the radiator cap (when the engine is cool or cold), not the antifreeze filler bottle, and sequentially rev the engine to about 2000 RPM to circulate the antifreeze mix and pour new antifreeze into the radiator. Do this until the antifreeze consistently and slightly overflows out of the radiator when you rev the engine. That should take care of it.

Posted on Sep 24, 2013

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Weak heat at best


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.

Jan 03, 2014 | 1999 Nissan Quest

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I just replaced my thermostat and all fluids are full and my heat is blowing luke warm, the hose to the heater core is hot real hot still not blowing hot


Check the return line on the heater core. If its not warm or hot, the core has a clog. Will have to be replaced.

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