Question about 1989 Nissan Maxima

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No heat just cold air

No heat comes out all i get is cold air even when the unit is off its the digital unit when the car is at normal operating temp the heater core is not even warm what can i do to fix this

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Make sure that the water level is correct at the radiator, first thing...

Posted on Jan 09, 2009

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Bravada temp gauge fluctuates and heater runs cold and hot?


Check coolant level for correct level. If coolant level good, possible head gasket failure

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I have a 2003 chevy impala. Just recently come acrossed in issue where the heater blows nothing but cold air even with the temp gauge going as high as it can get. Weather its at an idle or being driven....


providing your coolant is full cause low coolant will cause no heat
and your temp gauge is normal in the middle then most likely u have a bad blend door actuator usually on the passenger side

Feb 25, 2015 | 2003 Chevrolet Impala

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Heat goes in and out and the temp gauge goes up and down


Your temp sensor has nothing to do with your heater. The temp sensor needs coolant in order to work properly. So first check the coolant level because if it is low your heater will act the way you describe. Once the coolant gets low enough the heater will blow cold. Another possibility is the radiator cap. After the engine has warmed up it expands when it cools down it contracts. As it is contracting if the cap is weak air can be drawn into the system and cause air pockets to form and will cause the same problem

Feb 09, 2013 | 2000 Pontiac Grand Prix

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I have a '98 Olds Silhouette cooling fans work when A/C is on but will not come on even when temp is above normal operating temp if A/C is off


Just saw your second posting, so the temp is still above normal. Could the sensor
that controls the fan be not reading the heat properly ? The antifreeze/coolant
issue could still be relevant, so I will re-post that info. Tho.
Electric cooling fans will sometimes come on after a vehicle is parked,
(It actually heats up when stopped), but not when it is rolling down the road
because the movement is applying some cooling effect to the engine.
\
If the engine is not actually overheating, then the fans may be working
normally. Also, make sure your water/antifreeze mix is correct by using a
specific gravity tester. It is a tube with 4 or 5 balls, some of which will float
to give you a reading. Contrary to popular belief, More is not better when it
comes to antifreeze/coolant. It needs water to work properly. Too strong a
mix will actually make your vehicle run cold so that the temp sensors and
heater will not function properly. The engine will not achieve proper operating
temperature and may actually damage some of the components by running
it cold, affect timing, spark, etc. This could also cause the symptoms you
describe. The engine would not actually reach the proper heat threshold
until you added the extra demand of the AC heat transfer. But the first criteria
would be whether the engine is actually overheating / or in normal range .
It may be that the colder weather is allowing the sensors to come on a little
later, warming the engine and heater components a bit more than they would
in warmer weather. Would be good to know what the actual coolant temp is.
Could check that with a guage, and also check to see what temp thermostat
you are using. 195 degrees in the winter would be better, 165/180 or so in the
warmer months

Nov 30, 2011 | 1998 Oldsmobile Silhouette

1 Answer

Cooling Fans coming on shortly after starting cold vehicle Ford Winstar 2001


climate control units in most cars use the ac system to regulate temp in the cab. the ac system requires a fan to pull air over the condensor on the front of the car. its normal for a fan to come on. unless you have a bad engine temp sending unit thats causing the engine cooling fan to come on improperly. try turning off the heat and ac and see if it still comes on.

Feb 28, 2010 | 2001 Ford Windstar

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05 Chevy 2500HD blowing cold air


i have seen this problem when the level
of fluid is low in the radiator start with truck cold remove cap and fill with proper mix of antifreze for your area replace cap start truck with controls set for max heat
and check operation verify overfill tank is filled to cold level when completed

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1st check the coolant level. Low level will cause a no heat situation as you describe. What does the engine temp. gauge indicate? Is it indicating on the low side of normal, or is it in the normal range? If it indicates a low operating temp. after car warm up, the thermostat may be stuck open, which would not allow the car to fully warm up, and again, result in the no heat condition. Let me know about checking the coolant level, and temp gauge info. Curt

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