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Posted on Feb 09, 2011
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The heat in my '02 Mazda MPV works only sporadically. There is plenty of air blowing through vents, but it is usually cold. Anyone have any ideas? Thanks.

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Cali Camali

Cali Camali

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Cali Camali
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Do you notice any water leaking from under the dash on the passenger side that causes the floor mats to get wet? The leak (if any) would not be heavy or consistent. It's easy to not even notice it, or maybe you have felt a wet spot but you explained it away as a drink spill or something? While it could be something else, but if I were you I would flush the HEATER CORE. The symptom you describe is exactly what happens when a heater core is clogged. The wet spot starts happening means the clog is progressing and at any time you could be driving on the freeway in the bliss of utter cluelessness when the heater core explodes and 10 seconds later the cab fills with blinding white smoke and you can't see your hand in front of your face. A very deadly situation to be in ar 65 MPH... If you catch the problem at any time before it explodes you can save yourself a ton of money cause replacing a heater core is timely and expensive. A flush is a cakewalk, Check out youtube and search "heater core explodes while driving" it SCARY but there is a ton of videos showing how to flush the core. good luck.

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  • Posted on Feb 09, 2011
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Check the engine radiator for water /dont open the radiator cap when the engine is hot

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Related Questions:

0helpful
1answer

I posted a question about my 2000 mazda mpv when I turn on the heat in the front it blows hot on passenger side but not on driver side in fron by steering wheel
i cant give a direct answer i can only ask questions has anyone been under the dash put radio in heater core anything and knocked the vents loose do you hear air hissing or vacumm leak check fuse box for heater vents a/c vents blown fuse look under hood if you hear air look for loose hose going to firewall
Read full answer
Oct 13, 2014 • Cars & Trucks
0helpful
1answer

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.
Read full answer
Feb 10, 2014 • 2001 Mazda MPV
0helpful
1answer

Mazda mpv heater blows cold air and a/c does not work
your blend door is not functioning proper.
Read full answer
Dec 10, 2013 • Cars & Trucks
1helpful
1answer

My heater does not blow in floor in a dodgeram 1500
the heater vacuum motor and lines needs to be checked.Also get the blend door checked.

NO HEAT ON FLOOR VENTS

---------

As per your problem mentioned. There are few solved help links to troubleshoot these problems. Go through the list and Click the link below:----

2000 Toyota Avalon: No heat on Passenger Side?

http://whatisbyme.blogspot.in/2012/05/2000-toyota-avalon-no-heat-on-passenger.html


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No heat on Oldsmobile Silhouette?


http://technoanswers.blogspot.in/2012/02/no-heat-on-oldsmobile-silhouette.html

------------

Heater blows cold?

http://schematicsdiagram.blogspot.in/2012/02/heater-blows-cold.html

-----------

Heat blows cold on drivers side and hot on passenger side?

http://schematicsdiagram.blogspot.com/2011/12/heat-blows-cold-on-drivers-side-and-hot.html

----------

Hot air on the driver's side vents only?

http://repairhelpcenter.blogspot.com/2012/01/hot-air-on-drivers-side-vents-only.html

--------------

Temperature gauge does not move and no heat when heater is ON?

http://technoanswers.blogspot.com/2012/01/temperature-gauge-does-not-move-and-no.html

-----------

1992 Toyota Camry: A/C Control light Flashing and A/C not Blowing Cold?

http://technoanswers.blogspot.in/2012/04/1992-toyota-camry-ac-control-light.html

--------------

No heat, blower blows only cold?

http://technoanswers.blogspot.in/2012/02/no-heatblower-blows-only-cold.html

----------

Ford F150 Ac only blows through defrost vents?

http://technoanswers.blogspot.com/2012/01/forf-f150-ac-only-blows-through-defrost.html

----------

Dodge A/C come out of defrost vents only?

http://technoanswers.blogspot.com/2012/01/dodge-ac-come-out-of-defrost-vents-only.html

---------

Ac vacuum line on dodge cummins?

http://technoanswers.blogspot.com/2012/01/ac-vacuum-line-on-dodge-cummins.html

---------

Ford ranger AC blows cold through defrost vents instead on cabin vents?

http://technoanswers.blogspot.com/2012/01/ford-ranger-ac-blows-cold-through.html

----------

2005 Chrysler PT Cruiser: A/C Blows Warm?

http://whoisbyme.blogspot.in/2012/06/2005-chrysler-p8t-cruiser-ac-blows-warm.html

-------------

2009 Mercury Grand Marquis: A/C blows Cold From Defrost Vent Only?

http://whoisbyme.blogspot.in/2012/06/2009-mercury-grand-marquis-ac-blows.html

-----------

AC not blowing through Vents on 2007 Chevy Trailblazer?

http://schematicsdiagram.blogspot.in/2012/04/ac-not-blowing-through-vents-on-2007.html

----------

Passenger side temperature is warm air out of dash vents?

http://schematicsdiagram.blogspot.in/2012/04/passenger-side-temperature-is-warm-air.html

----------


These will help.

Thanks.

Read full answer
Nov 28, 2012 • Cars & Trucks
0helpful
1answer

No heat from vents

As per your problem mentioned. There are few solved help links to troubleshoot these problems. Go through the list and Click the link below:----

2000 Toyota Avalon: No heat on Passenger Side?

http://whatisbyme.blogspot.in/2012/05/2000-toyota-avalon-no-heat-on-passenger.html

------------

No heat on Oldsmobile Silhouette?


http://technoanswers.blogspot.in/2012/02/no-heat-on-oldsmobile-silhouette.html

------------

Heater blows cold?

http://schematicsdiagram.blogspot.in/2012/02/heater-blows-cold.html

-----------

Heat blows cold on drivers side and hot on passenger side?

http://schematicsdiagram.blogspot.com/2011/12/heat-blows-cold-on-drivers-side-and-hot.html

----------

Hot air on the driver's side vents only?

http://repairhelpcenter.blogspot.com/2012/01/hot-air-on-drivers-side-vents-only.html

--------------

Temperature gauge does not move and no heat when heater is ON?

http://technoanswers.blogspot.com/2012/01/temperature-gauge-does-not-move-and-no.html

-----------

1992 Toyota Camry: A/C Control light Flashing and A/C not Blowing Cold?

http://technoanswers.blogspot.in/2012/04/1992-toyota-camry-ac-control-light.html

--------------


No heat, blower blows only cold?

http://technoanswers.blogspot.in/2012/02/no-heatblower-blows-only-cold.html
----------

Ford F150 Ac only blows through defrost vents?

http://technoanswers.blogspot.com/2012/01/forf-f150-ac-only-blows-through-defrost.html

----------

Dodge A/C come out of defrost vents only?

http://technoanswers.blogspot.com/2012/01/dodge-ac-come-out-of-defrost-vents-only.html

---------

Ac vacuum line on dodge cummins?

http://technoanswers.blogspot.com/2012/01/ac-vacuum-line-on-dodge-cummins.html

---------

Ford ranger AC blows cold through defrost vents instead on cabin vents?

http://technoanswers.blogspot.com/2012/01/ford-ranger-ac-blows-cold-through.html

----------

2005 Chrysler PT Cruiser: A/C Blows Warm?

http://whoisbyme.blogspot.in/2012/06/2005-chrysler-p8t-cruiser-ac-blows-warm.html


-------------

2009 Mercury Grand Marquis: A/C blows Cold From Defrost Vent Only?

http://whoisbyme.blogspot.in/2012/06/2009-mercury-grand-marquis-ac-blows.html

-----------

AC not blowing through Vents on 2007 Chevy Trailblazer?

http://schematicsdiagram.blogspot.in/2012/04/ac-not-blowing-through-vents-on-2007.html

----------

Passenger side temperature is warm air out of dash vents?

http://schematicsdiagram.blogspot.in/2012/04/passenger-side-temperature-is-warm-air.html

----------


These will help.

Thanks.

Read full answer
Nov 28, 2012 • 2006 Ford Taurus
1helpful
2answers

When I turn on the heat in my 2004 mazda mpv 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.

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.

Read full answer
Jan 14, 2011 • 2004 Mazda MPV
2helpful
2answers

My 2004 Mazda MPV AC does not seem to be working it blows air out but not as cold as it should be - any ideas - it seemed cold enough last week 
My 2004 MPV was just diagnosed with a corroded aluminum line to the rear cabin air-con unit. It cost me $50 to get the unit leak-checked. Also got a $700 estimate to replace the line.
Read full answer
Jun 07, 2009 • 2004 Mazda MPV
10helpful
4answers

2004 Mazda MPV cabin air is just not getting hot enough.
If changing the thermostat didn't work, have the heater control valve checked, it may not be opening all the way to let the coolant circulate thru the heater core fully.
Read full answer
Jan 21, 2009 • 2004 Mazda MPV
1helpful
1answer

Fully warmed up; blowing hot and cold; Suzuki XL-7
Its just a vent damper plate not operating, it's like a gate which controls the flow of air,,usually they are operated by vacuum, or cables.
Service center time, unless you are handy with your own repairs.
Read full answer
Jan 19, 2009 • 2004 Suzuki Verona
0helpful
1answer

Cold air coming from rear vent of 2000 mazda mpv
Your ventilation shutter is not closing properly.
Read full answer
Nov 17, 2008 • Oldsmobile Bravada Cars & Trucks
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I posted a question about my 2000 mazda mpv when I turn on the heat in the front it blows hot on passenger side but not on driver side in fron by steering wheel

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