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Author Topic: 1998 mazda mpv no heat in cab  (Read 1329 times)

Offline mpv2tone

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1998 mazda mpv no heat in cab
« on: December 19, 2009, 11:05:09 am »
 ??? ??? hey guy's i am new here and need some help. here's the problem i have a mazda 4x4 mpv and have no heat in the cab. i changed the thermosat,water pump and backed flush the heater core. heater core flows nice after back flush and has no leaks. thermostat opens when it reachs temp.water pump flow good also.now here is the head cruncher in the garage i get very good heat in cab but when i start to drive it blows out cold air.
can someone please help me figure this out. ??? ???

p.s no leaks anyway but get alot of air in system

thanks
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Online blur911

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Re: 1998 mazda mpv no heat in cab
« Reply #1 on: December 19, 2009, 11:43:16 am »
Possibly the thermostat is stuck open and the engine is cooling too much.  Does it have a gauge?

Or, a flap in the heater is open to cold outside air instead of heated air.
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Offline mpv2tone

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Re: 1998 mazda mpv no heat in cab
« Reply #2 on: December 19, 2009, 12:11:11 pm »
well the thermosat opens when it get's hot and the gauge inside shows 1/4 to almost half.and for that door can you tell me more about it or have a pic.
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Offline articsteve

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Re: 1998 mazda mpv no heat in cab
« Reply #3 on: December 19, 2009, 02:56:50 pm »
Phone a Mazda dealer and see if your model has a heater control valve.  If not, then you have a stuck heater box door.  Don't know the car, but you might get at it if you take out the glove box.  It will be located very close to the heater core. Normally the whole friggin console comes out to get at these things.
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Offline mpv2tone

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Re: 1998 mazda mpv no heat in cab
« Reply #4 on: December 19, 2009, 03:29:44 pm »
well there is a valve but the thing is i dont know where it goes because when i got the van it was all taken apart do you know where it go's. before the core or after and dose it look like a T connect with a screw cap and what dose this do. oh one thing i disconnected the rear core due to leaking and i will check the door but if it working what eles could it be.i'am exhaust of trying to figure this :censor: out and so is my mechanic.
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Offline articsteve

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Re: 1998 mazda mpv no heat in cab
« Reply #5 on: December 19, 2009, 09:08:03 pm »
and dose it look like a T connect with a screw cap and what dose this do.

Usually looks like that.  Also usually vacuum controlled so look for vacuum hose going to it.


do you know where it go's. before the core or after

Usually placed somewhere on the firewall.  I would think it will be after the heater core so follow the return hose.

This is a pic of a heater valve from a 98 V6 Mazda pickup.  Could not find one for your model.  Does the dealer sell one for your model?
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