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07 mgm heat problem
11-09-2017, 09:48 PM
Post: #1
07 mgm heat problem
2007 mgm. Heater core flushed. Blend door shut. All hoses are warm. Heat wont stay hot. Was warm in garage then cold as idrove outside. What can i do?
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11-10-2017, 11:32 AM
Post: #2
RE: 07 mgm heat problem
What HVAC system do you have, the standard or EATC?
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Frank the Vic — 2007 CVPI SAP, Dark Toreador Red, Stock
Mocha — 2014 Hyundai Tucson SE, Kona Bronze, Stock
Whitey the Beater — 1999 F-150 Lariat, 5.4 V8, Retired with 242,000 miles
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11-10-2017, 05:12 PM
Post: #3
07 mgm heat problem
^^^^^^what he said. Also did you run it long enough to circulate and burp the air out?

It is what it is
2006 GMQ, 2010 CVPI
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11-10-2017, 06:54 PM
Post: #4
RE: 07 mgm heat problem
Yeah it ran for about 40 mins. It is the eatc
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11-10-2017, 07:26 PM
Post: #5
RE: 07 mgm heat problem
From some diagrams i was looking at online the door (behind the glove box) i was looking at is the air inlet door. The blend door is somewhere behind the radio?
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11-11-2017, 06:42 AM
Post: #6
07 mgm heat problem
To get to the blend door the dash has to be pulled forward. Some have gone through where the airbag is. About a 4 hour job. On the eatc the orings go bad and need to be replaced.

It is what it is
2006 GMQ, 2010 CVPI
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11-11-2017, 10:50 AM (This post was last modified: 11-11-2017 10:52 AM by Black Ice LSC.)
Post: #7
RE: 07 mgm heat problem
try a self-test. sometimes the eatc will calibrate the air doors and blend door actuator and the heat will work again, albiet temporarily.

my 06 MGM has blend door issues...in the summer, the ac wont always work so I use the self-test a time or two and it'll work again.
Now it's winter and I need the heat...and that's what I have...all the time...unless I do the self-test where it will let me cool the interior if it's warm out.

I am so tired of working on my own car's climate control issues. my last CV was a 2000 P71 and the heater core went out. That was manual climate control, and not a very fun job.
My next car was a 98 mark VIII LSC which had known blend door actuator issues...no heat...upper arm broke...I lived with it for 1 winter, and sold it last winter because I refused to do the 8 hour job of repairing it. I bought my 06 MGM on the coldest day of the year (California, sacramento, 25 degrees out) and when I got to the scab-lot 2 hours away in a one-way rental, only the AC worked....no heat!!! I performed the self-test in the lot and it worked...the seller asked what I did, and I said "got you to lower the price"...it worked, and I drove it home....and loved having a heater.

try to get it to repair itself with the EATC self-test process and see if it'll at least get you some heat.
Former Lincoln Mark VIII owner/specialist
Former P71 owner
Current 2006 MGM owner
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