my 95 se heats very slowly, and never gets really warm below 25f or so.
manual heat, not auto.
anyone else freezing ?

 

1) Make sure the coolant system is full. Air pockets will detract from
heater performance.

2) Make sure the thermostat is working. Does the temperature gauge show a
normal reading? Does the upper radiator hose get really hot? A
stuck-open thermostat may prevent the engine from reaching normal operating
temperature. This will detract from heater performance.

3) Check the air mix door and its control mechanism. The mix door blends
cool outdoor air with heated air. If the mix door is in the 100% outdoor
air position you will get no heat, even though the heater core may be hot.

4) Your Maxima may be equipped with a Water Control Valve. This valve
controls the flow of engine coolant through the heater core. Its purpose
is to keep the heater core cool while the A/C is running. It may be
operated by a steel wire control cable or by engine vacuum gated by a
solenoid valve. If the Water Control Valve is closed you will not get any
heat even though the engine is hot. See the Haynes '93-'99 Maxima manual,
photo 11.7 on page 3-10 or the Chilton '93-'98 Maxima manual, Figure 18,
page 6-9. You may purchase these manuals at any large bookstore or auto
parts store. You may find them on the shelf at your public library.

 

Does your temperature guage ever rise over the C mark? If not, your radiator's thermostat is stuck open. If it is normal(between C and H), you HVAC systems heater core is shot.