Question about 2000 Mazda MPV

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2000 Mazda MPV Heating problem

My heating system in the back is blowing cold air only, and I can not find our why, does the 2000 MPV have a circulating pump in the back

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The heater lines that run to the back of the right rear side gets rusty and start to leak anti-freeze. There is a black cover under and above the RR tire that has to be removed so u can see.

Posted on Feb 09, 2009

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I struggled with this same problem. It took me almost a year to find out why. Unfortunately, the reason is that Mazda makes 2 versions of the 2000 MPV. One version (like mine & probably yours) is sold in the South (mine was from Florida) & the back blower is connected to the AC only. The other version of course connects to the heater line too. Not sure why any car company would ever come with something so absrd, but Mazda did. Hope this helps!

Posted on Feb 12, 2009

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1 Answer

Rear area of mpv receives cold air but not heat.


That is usually a blend door problem. One of the doors is stuck in the cold position only. Happens a lot after a battery disconnect. Replace the rear blend door and that should solve your problem.

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Have you checked your antifreeze level? When the vehicle is cool check the level and top it off if its low. Read your manual if you're not sure where to look.

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I drained the coolant on my mpv 2000 by loosening the drain plug. Coolant came out but the coolant on the reservoir is not draining. Any thought? thnks


Besides that is usually the case

Have to draw out with turkey baster or remove
the degas bottle & wash out if that is what you want

Changing the coolant has nothing to do with no heat

The thermostat may be stuck open or you have a coolant
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When I turn on the heat in my 2004 mazda mpvicon1.png the front air vents blow heat but the rear air vents are blowing cold. I have adjusted every setting is there something I am overlooking.

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I have antifreeze in the reservoir just changed the thermostat and gasket, all the fuses are good and the blower works great on my Mazda MPV year 2000, but I still have no heat only cold air is coming out...


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2 Answers

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You probably never cleaned the cooling system out.

If you have not get it done by pros.

It seems something is blocking the flow. If the water pump went bad you will know. Rarely ever heard a impeller breaks off like you think. The bearings and the seal break first.

Check and see also if the heater valve is working.

As for the over heating even new thermostats fail. Reverse flush is needed or the procan measure the pressure in the radiator cooling system and edetermine if there is a engine pressure problem. Tools and experience is the key in the game of diagnosis.







wfg8.com

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1 Answer

Heating problem


The ducting to the left must be fed from the heater box. Yet the blend door must not be sealing allowing the cold air the blend with the hot. Check the blend door mechanism, behind glove box, or some dash panels may need to be removed to access this door.

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