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2004 MPV heat-Front blows hot, rear blows cold air (winter)
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deak88
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PostPosted: Tue Jan 07, 2014 11:31 am    Post subject: 2004 MPV heat-Front blows hot, rear blows cold air (winter) Reply with quote

I am new to the forum and have been searching around the site looking for a solution. I haven't found anything specific but I have gotten a few leads...

I have a 2004 MPV that I love. The only problem is that the rear blows cold air during the winter months (New England weather). All air is moving normal, no fan problems, heat is fine in the front, cold blowing air in the rear.

I came across a post that mentioned on the fire wall I can find the Heater Control Valve. Located high on the firewall and biased right from center. Down is open (allows heat to the front controls). I am hoping this will resolve my rear heat problems.

I am wondering if anyone has had this same issue, what they found, what they did to repair...etc. Thanks!!
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austinbirdman
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PostPosted: Tue Jan 07, 2014 1:52 pm    Post subject: Re: 2004 MPV heat ... rear blows cold air (winter) Reply with quote

I have had the same problem for years. We've just lived with it, since we live in Austin where it's rarely cold. But I would like to fix it. Does anyone know how?
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vinnyg
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PostPosted: Tue Jan 07, 2014 3:33 pm    Post subject: 4 Seasons Package? Reply with quote

Are you sure you have the four seasons package, because only that package offered rear heat. If you do not have that package and are sliding the rear fan switch to "on" under the main climate control dials on the front dash, then you only get cold air coming out of the overhead vents, which is totally normal and supposed to be used for air conditioning mode only. (This switch):
http://www.ebay.com/itm/00-01-02-03-04-05-06-MAZDA-MPV-REAR-AC-A-C-AIR-FAN-BLOWER-MOTOR-CONTROL-SWITCH-/221347196850?pt=Motors_Car_Truck_Parts_Accessories&hash=item3389522fb2&vxp=mtr

In my '05 we don't have that package and the rear seating area only gets heat via the floor vents under the front seats, which takes a while to heat up the rear cabin area. The rear control on the four seasons package looks like this and will identify if you have it:
http://www.ebay.com/itm/00-01-02-03-04-05-06-MPV-AC-A-C-HEATER-TEMPERATURE-CONTROL-UNIT-SWITCH-REAR-OEM-/140978932666?pt=Motors_Car_Truck_Parts_Accessories&hash=item20d2ffcbba&vxp=mtr
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Cappellan
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Joined: 28 Oct 2005
Posts: 120
Location: Bremerton, WA, USA

PostPosted: Thu Jan 09, 2014 1:37 pm    Post subject: Re: 2004 MPV No rear Heat Reply with quote

This will help in determining if you have rear heat or not.

http://forum.mpvclub.com/viewtopic.php?t=16991&postdays=0&postorder=asc&start=15

This can help in troubleshooting no rear heat. http://forum.mpvclub.com/viewtopic.php?t=5322
http://forum.mpvclub.com/viewtopic.php?t=15437

My vehicle has rear AC only. If you post a pic of the rear controls, it will be easy to determine.

15 Mazda CX5
x-05 Ford Freestyle (POS)
00 MPV LX
94 Mazda B2300
x-83 and 96 Escort
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deak88
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PostPosted: Tue Jan 14, 2014 1:32 pm    Post subject: 2004 MPV heat-Front blows hot, rear blows cold air (winter) Reply with quote

Well I tried some trouble shooting on the rear air only blowing cold. As mentioned I have an 04 ES fully loaded (leather, moonroof, etc). Some of the links listed above talk about 4 season packages, cold only, heat only, combination of both. What is going on??? Why would M do something so dumb.

I am in MA and bought the car used from someone in Maine so I am hoping I have both rear heat and rear air. I do have both floor and ceiling vents and my control in the back has fan and temp (2 controls I believe).

- I checked on the firewall and found the valve that controls the flow and this is wide open

- My antifreeze res was empty?? So I filled and ran the car for a while. My wife drives daily so after about a week, rechecked and noticed it was empty again. I don't believe I have a leak but the weather did go from in the teens to above 32 so I am hoping that allowed for the fluid to circulate.

- Ran the car for a while and turned on rear heat. Vent from rear floor/side still blowing cold air.

I am out of ideas...
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scross
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Joined: 07 Nov 2005
Posts: 2465

PostPosted: Tue Jan 14, 2014 2:25 pm    Post subject: Re: 2004 MPV heat-Front blows hot Reply with quote

Sounds like you have a lot of air in your cooling system. Either you have a leak somewhere, or at some point in the past work has been done on the system but they failed to get all of the air out of it afterwards. (That's exactly what the valve is for, BTW - to help purge air out of the cooling system.)
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Cappellan
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Joined: 28 Oct 2005
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Location: Bremerton, WA, USA

PostPosted: Tue Jan 14, 2014 6:11 pm    Post subject: Re: 2004 MPV heat-Front blows hot Reply with quote

http://forum.mpvclub.com/viewtopic.php?t=5322&highlight=radiator+air+purge

This talks about how to purge air from the rear heating pipes.

15 Mazda CX5
x-05 Ford Freestyle (POS)
00 MPV LX
94 Mazda B2300
x-83 and 96 Escort
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scross
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PostPosted: Tue Jan 14, 2014 11:20 pm    Post subject: Re: 2004 MPV heat-Front blows hot Reply with quote

If the weather is warm enough, you should shut off that valve temporarily. This will block the flow of coolant through the FRONT heater core (so it will stop working), but force more coolant through the BACK heater core, flushing out any air in those lines. You will, of course, have to keep topping up the overflow tank until all of the air is purged.

Come to think of it, while you have the hood open check to see if a rear bypass has been made on the front heater lines. The rear lines on these vehicles have been prone to leakage, and instead of replacing them (expensive) or patching them (cheap), some people have chosen just to bypass them completely, meaning no heat back there. The following thread has a pic of the kind of thing to look for here.

http://forum.mpvclub.com/viewtopic.php?t=17056
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