Question about 2007 Nissan Maxima SE
Once car begins running, it heats up. Once car stops or idles, blows cold air
Sounds like low coolant level.. If it's extremely cold out, say 10 below zero or more, it could just be plain to cold. In that case, temporarily blocking a portion of the radiator with a cardboard cutout can help,, but make absolutely sure the cardboard is in front of the radiator, between the cars grill and the radiator, and not anywhere it could absorb fuel or oil and cause a fire... Also,,, make sure it's removed when the weather warms up in the spring. But I expect you'll find your coolant is low and when the engine is at idle, you not getting good flow of heated coolant through the heater core.
Posted on Jan 15, 2013
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Posted on Jan 02, 2017
SOURCE: No heat while idling
A stuck or partially stuck thermostat.
Rust or other deposits restricting flow through hearer core
Stuck water heater valve (if so equipped)
Low coolant level.
Low battery voltage.
+ all the things avid101 listed.
Posted on Sep 05, 2009
SOURCE: nissan 2000 ac hot when idle
the a/c condenser has a fan in front ( there is actually 2 fans if you sit on the car it will be fan on right side ) if this fan does not
come on immediately when you are parked and engine in idle
there is a problem with power to it, or motor failure. If you drive it
on the highway and a/c operates fine that's because air is circulating though condenser (thats what the fan is supposed to do at idle or slow traffic)
Posted on Aug 27, 2008
with the engine idling you water temp might not get hot enough to open your thermostat that lets hot water go through your heater core. I would first have the easiest thing changed. the thermostat could be you main problem.I hope this helps you.
Posted on Nov 26, 2008
SOURCE: heater bows cold when idling
You need to bleed the cooling system.
To do this park on level ground, when cold remove coolant filler cap, start engine and leave to idle.
Have plenty of warm/hot water available, when engine reaches operating temp it may appear to boil over so keep away from coolant filler, top up with warm/hot water and wait as it may bubble over a few times before settling.
Replace cap and hopefully back to normal, Remember your Anti Freeze?
Posted on Jan 16, 2009
I am having/had the same problem. My rear heater has not worked the last 2 winters, still trying to figure that one out. But I think I solved the front heat problem myself. The heater was blowing cold air while idling and hot air when the car was moving.
I jacked up the front of the vehicle, took the cap off of the reserve tank for the radiator, turned the car on and ran the heat (AC off) for 15 minutes. This is supposed to release any air bubbles in the coolant system and I did see air bubbles emerge as I was watching (this might be normal occurance, I'm far from a mechanical expert). Anyway, this did not immediately solve the problem, still blowing cold air as it sat there idling after 15 minutes. Dejected, I put the cap back on, lowered the vehicle and resigned myself to taking it to a dealer.
But a funny thing happened the next day, the coolant level was a lower (no leaks on the floor) so I filled up, and sure enough, when I started the car and let it warm up a little, hot air started coming out of the heater!!!
As far as my wife knows, I fixed the problem for the price of a bottle of coolant, so I am a hero...but at first I thought it didn't work. Here we are a month later and still blowing warm air and haven't had to replace any more coolant...the internet is a wonderful thing!
Hope this works for you, and I hope I can figure out my rear heater problem as well.
Posted on Jan 30, 2009
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