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Front Heater-no warmth
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sea&xc
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Joined: 01 Sep 2006
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PostPosted: Tue Jun 05, 2007 10:07 am    Post subject: Front Heater-no warmth Reply with quote

What's the best route to diagnosing this problem?
Searching through the site have revealed mostly Rear AC/Heat issues.

The front heater isn't producing heat. Fan and AC work fine.
Rear heater and AC work fine.
Fuse is good.
I've had no issues up to now with the heater.

Yesterday we had a cool and rainy day which made me turn the heat on. Only cool/ambient air came throught the vents. I've tried all levels of fan/heat. I had been driving for approx 1 hr so the engine was plenty warm.

Also I had the 100k service done by the dealer about 2 weeks back. I specifically asked about the Rear Heater recall. (Dealer said my PV wasn't covered and I need to talk to Mazda, story for another time)
So I wonder if the tech my have screwed with the front heater then?

Again fuse is good, coolant is good what else should I check before I get on the dealer's bum?

Thanks

03 Black LX 4Seasons, Roof Rack, Pdoors, Hitch
98 v70 AWD
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nls
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Joined: 23 Feb 2005
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Location: IL, USA

PostPosted: Tue Jun 05, 2007 11:19 am    Post subject: Re: Front Heater-no warmth Reply with quote

Mine is a 2000, but I believe that later models have valves on the coolant lines, separately for the front and rear. If that is the case, you might want to check whether the front valve somehow got turned off.
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sea&xc
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PostPosted: Tue Jun 05, 2007 7:22 pm    Post subject: Re: Front Heater-no warmth Reply with quote

A quick look under the hood and I've found 2 valves but I believe they are for AC. One was back against the firewall and the other was up front near the coolant reservoir.

Following the lines around the engine I've yet to ID a valve or manifold that might fix it. I haven't gotten under the front to see if the lines wrap around to the lower rear of the engine yet.

Anybody else have ideas while I'm searching?

Ryan

03 Black LX 4Seasons, Roof Rack, Pdoors, Hitch
98 v70 AWD
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sea&xc
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PostPosted: Tue Jun 05, 2007 8:17 pm    Post subject: Re: Front Heater-no warmth Fixed Reply with quote

Found the valve and it solved my issue.

Located high on the firewall and biased right from center.

Down is open (allows heat to the front controls) shown.

Dealer tech must have switched the position and never fixed it.
Thanks NLS for the tip.

03 Black LX 4Seasons, Roof Rack, Pdoors, Hitch
98 v70 AWD




Front heater valve switch
6-04-07 005.jpg

6-04-07 005.jpg - File downloaded or viewed 7324 time(s)

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2003MPV-LX
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Joined: 19 Mar 2004
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Location: Dallas, GA, USA

PostPosted: Wed Jun 06, 2007 6:43 am    Post subject: Re: Front Heater-no warmth Reply with quote

Wow, guess if that happens to me, I'll have to check that out. Wonder if it got bumped by accident.

2003 MPV LX, Emerald Mica, Rear Spoiler, Auto-Exe Grill, Fog Lights, hitch, Concept DVD w/twin headrest mounted 7" monitors, K&N, visors, splash guards, LIMO tinting on all rear windows. silverstars. Mama's Zoom-Zoom
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Gig2005
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PostPosted: Fri Jul 20, 2007 1:37 pm    Post subject: Re: Front Heater-no warmth Reply with quote

I have problems with heat as well. In winter when it's -20C it takes quite a long time for the warm air to come through the vents. Last fall I had rear heater pipes replaced by a Mazda dealer (recall), but I have no heat in the back. Took the van to the dealer recently. They charged me for diagnostics and said that a further investigation is needed. They suspect air in the system.

I have MPV 2002. I'm wondering if there are valves hidden somewhere. I tried to locate them but I didn't find anything.
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creed205
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Joined: 26 Jan 2004
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Location: Montreal, QC, CA

PostPosted: Thu Aug 27, 2009 8:51 pm    Post subject: Re: Front Heater-no warmth Fixed Reply with quote

sea&xc wrote:
Found the valve and it solved my issue.

Located high on the firewall and biased right from center.

Down is open (allows heat to the front controls) shown.

Dealer tech must have switched the position and never fixed it.
Thanks NLS for the tip.


WOW! I have been a member here for a while and done a lot of research when I have had my troubles in the past. Never has a solution been so easy to find and bang on the money. Thanks to everyone!

Thanks,
Marcus
---------------
Current Cars:
2003 Mazda MPV DX - Black, Convenience Package, Tinted Windows, Hitch

Old Cars:
1995 Pontiac Grand 'Am
1994 Chevy Cavalier
1990 Mazda 626 SE
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Gebco
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Location: Winnipeg, MB, CA

PostPosted: Thu Aug 27, 2009 10:48 pm    Post subject: Re: Front Heater-no warmth Reply with quote

Wow! Is Montréal so cold that you had to use your heat already? The weather here has been lousy too, but not that bad. . .
15 Town and Country
08 Town and Country Limited 180 000 km - Sold
02 MPV ES Midnight Blue 125 000 km - Sold
05 Kia Amanti - aka Old Man Car 68 000 km
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Mr_MVP
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PostPosted: Mon Sep 28, 2009 9:03 am    Post subject: Re: Front Heater-no warmth Reply with quote

Thanks sea&xc! This solved my issue too. It was real simple and I look like a star to my wife!

Perhaps the dealer turned it off when they fixed my faulty water pump and a vacuum hose? (see http://forum.mpvclub.com/viewtopic.php?p=191085#191085 )

This probably saved me a couple of hundred bucks diagnosis and spurios charges.. God Bless MPVClub.com!
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iggyES
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Joined: 26 Feb 2007
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Location: Lehigh Valley, PA, USA

PostPosted: Mon Oct 05, 2009 10:40 am    Post subject: Re: Front Heater-no warmth Reply with quote

Woot! Just did a flip of the valve myself after no heat on the ride home from the in-laws last night and a quick search here.

I am guessing that when my mechanic changed out my PCV hose he inadvertenly hit it and I am just now noticing as last night was the first time we have tried the heat this season.

Sadly one of my first thoughts was how many shady mechanics would charge someone a diagnostic check along with a min. of one hours labor to flip this valve?

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grayMPV
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PostPosted: Thu Oct 08, 2009 10:43 am    Post subject: Re: Front Heater-no warmth Reply with quote

I just found this forum as I searched for the heater problem with my new (to me) 2005 MPV. I also wanted to say thank you to sea&xc since you were right on--problem solved. The picture was great too, very much appreciated.

Now that I've found the forum I'll be back.
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sk8nmom
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PostPosted: Mon Nov 02, 2009 3:14 pm    Post subject: Re: Front Heater-no warmth Reply with quote

My brother is a mechanic, although he's out of work now. He showed me the little switch to get my heat back before I saw it on here, but I'm so thankful that if I hadn't had him to help me I could have found the solution here!
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donizard
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PostPosted: Sat Nov 20, 2010 12:09 am    Post subject: Re: Front Heater-no warmth Reply with quote

I had to have a OIL leak on the rear valve cover repaired for over $400.
On the way home - had NO heat !! Took it back - TECH checked the coolant level - but never checked the valve - STILL no heat.
SO - I read this post - check the switch with is 3/4 UP - switched to DOWN
and warm as TOAST . . .

NOW ? - should there be a screen on the open area above the valves?
I see two bolts sticking out - with NOTHING attached ?

Thanks to ALL - I loved my 2004 - never had a problem - bought the 2006 to have the last in the line - what a mistake !!!! Antilock brake problems after a wheel bearing went bad - and annual check engine !
ONLY 34,500 miles !!
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rajulshah
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PostPosted: Wed Oct 12, 2011 7:52 pm    Post subject: Re: Front Heater-no warmth Reply with quote

P e r f e c t!

I took my van in to replace the O2 sensor (bank 1 sensor 1) and noticed the lack of warmth from the front heater the next morning. I checked the fuse it was fine. Then wondered if the O2 sensor was faulty and had anything to do with it.

The picture here was priceless. Took me no time to find the valve and so happy to see it in the wrong position. I half suspect the switch was thrown up on purpose so I would come back and pay the garage another couple of hundred bucks to replace the heater core, etc. etc.

Thanks everyone!

Rajul
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netdesign_98
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Joined: 13 May 2004
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Location: Mississauga, ON, CA

PostPosted: Thu Oct 20, 2011 7:18 pm    Post subject: Re: Front Heater-no warmth Reply with quote

Thank you sea&xc. You save me $.
It is the same story. Took the car in a few months back (summer) to the dealer for rough idle. Yes it is the PVC collapse. Cost me $.. beside the PVC house, change spark plug, filter........
And now the weather is cold, found out no heat in the cabin...
Yes the switch is up.....
Put it down and now heat is back...
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