Coolant System Bleeding w/Rear Heat
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Junior Member
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I found this in another forum. Does anyone have this TSB?
There was air in the system. I’m not sure if it all is gone, but both issues are definitely better today. I’ll bleed the system again properly over the weekend just to be sure. Apparently there was a design issue with the 03 & 04 models that had the rear HVAC unit, so they added a control valve at the firewall to assist in bleeding the rear unit. Mazda issued a service bulletin- US Bulletin No. 07-004/04. Applies to 2003-2004 MPV Dated 08/2004
There was air in the system. I’m not sure if it all is gone, but both issues are definitely better today. I’ll bleed the system again properly over the weekend just to be sure. Apparently there was a design issue with the 03 & 04 models that had the rear HVAC unit, so they added a control valve at the firewall to assist in bleeding the rear unit. Mazda issued a service bulletin- US Bulletin No. 07-004/04. Applies to 2003-2004 MPV Dated 08/2004
Senior Member
Joined: Oct 2018
Posts: 10,334
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From: Northern California
TSBSearch.com Require TSB
Sometimes you need to actually pay for information?
Sorry that TSB is so old its not even in ALLData. That also means that during that period of times anyone working in a Mazda service shop (**even the janitor a joke)could write them up. So they are not as accurate regarding all the information as they are now. Just keep that in mind when you get it?
** whats wrong here ?? lol
TSB Make: Mazda Number:07-004/04 Title:Lack Of Warm Air From Front Heater Date:1/1/1970 Models:2003-2004 MPV
Sometimes you need to actually pay for information?
Sorry that TSB is so old its not even in ALLData. That also means that during that period of times anyone working in a Mazda service shop (**even the janitor a joke)could write them up. So they are not as accurate regarding all the information as they are now. Just keep that in mind when you get it?
** whats wrong here ?? lol
TSB Make: Mazda Number:07-004/04 Title:Lack Of Warm Air From Front Heater Date:1/1/1970 Models:2003-2004 MPV
Last edited by Callisto; Jan 16, 2026 at 03:55 PM.
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Junior Member
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Look what I found.
https://charm.li/Mazda/2004/MPV%20V6...ront%20Heater/
It says: "A Water Valve was added to assist in bleeding air from the rear heater during vehicle production."
Of course my original problem of how to bleed system of air is still there.
https://charm.li/Mazda/2004/MPV%20V6...ront%20Heater/
It says: "A Water Valve was added to assist in bleeding air from the rear heater during vehicle production."
Of course my original problem of how to bleed system of air is still there.
Senior Member
Joined: Oct 2018
Posts: 10,334
Likes: 198
From: Northern California
Nice find.... took some work on your part. Glad to see a member actually looking for info.
I look at our service history and sorry I don't have in the last 5 years doing a cooling system service on your model Mazda so I don't have any practical hands-on experience to suggest to you.
With stubborn cooing systems coolant replacements, we use the cooling system coolant replacement equipment that has a vacuum assist air purge. PIA and time consuming to use.
I look at our service history and sorry I don't have in the last 5 years doing a cooling system service on your model Mazda so I don't have any practical hands-on experience to suggest to you.
With stubborn cooing systems coolant replacements, we use the cooling system coolant replacement equipment that has a vacuum assist air purge. PIA and time consuming to use.
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