Nissan (Quest) heater blowing only warm not hot...

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Dean - 12 Oct 2005 19:51 GMT

My buddy asked me about his 3.0L V6 Quest (mini van), says it blows
only warm, sometimes hot, sometimes cool. I told him to check the
coolant level, anything else simple that can be checked?

Thanks!

Dean

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Mike Walsh - 12 Oct 2005 21:56 GMT

Thermostat. Take it out. It should be completely closed when cool. It should not start to open until it reaches its rated temperature. Put it in a pan of hot water. For a typical thermostat (around 195 deg F) the water will be close to boiling when the thermostat fully opens.
Air control doors. Move the heater controls. The temperature control door should move all the way in one direction for heat.

> My buddy asked me about his 3.0L V6 Quest (mini van), says it blows
> only warm, sometimes hot, sometimes cool. I told him to check the
[quoted text clipped - 3 lines]
>
> Dean

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Mike Walsh
West Palm Beach, Florida, U.S.A.

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Hugo Schmeisser - 13 Oct 2005 01:12 GMT

> > My buddy asked me about his 3.0L V6 Quest (mini van), says it blows
> > only warm, sometimes hot, sometimes cool. I told him to check the
> > coolant level, anything else simple that can be checked?

> Thermostat. Take it out. It should be completely closed when cool. It
> should not start to open until it reaches its rated temperature. Put
> it in a pan of hot water. For a typical thermostat (around 195 deg F)
> the water will be close to boiling when the thermostat fully opens.
> Air control doors. Move the heater controls. The temperature control
> door should move all the way in one direction for heat.

I believe the thermostat ought to be FULLY OPEN at its rated
temperature. It will begin to open some 20F or so /below/ its rated
tepmerature.

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Scott Dorsey - 13 Oct 2005 03:32 GMT

>My buddy asked me about his 3.0L V6 Quest (mini van), says it blows
>only warm, sometimes hot, sometimes cool. I told him to check the
>coolant level, anything else simple that can be checked?

Check the thermostat. If you don't have a proper engine temperature
gauge, the engine may be running too cool to give proper heat and you
wouldn't know it.
--scott

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"C'est un Nagra. C'est suisse, et tres, tres precis."

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Dean - 13 Oct 2005 15:42 GMT

Can't we just look at the engine temp and see if its in the middle?

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SherBear - 22 Oct 2005 01:31 GMT

Sounds like you didnt get much help with your problem I was just woundering
if your friend ever got it to work properly?? I got a 94 Grand Am that does
the same thing and its not the thermostat. Its not the heads either or the
radiator. I posted one also on my car.

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Dean - 22 Oct 2005 06:18 GMT

It was the coolant level being low. At least he thinks it was, its hard
to get much out of him as he knows nothing at all about cars and
doesn't listen to what the mecahnic says.

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