Has anyone had a problem with the A/C vents on the dash changing to the defrost vent at low engine vacuum? I've changed the vacuum check valve on the firewall to no avail. It's a 2003 300 A. Any help appreciated.
SheriffbigD
HVAC Vent Problem
Has anyone had a problem with the A/C vents on the dash changing to the defrost vent at low engine vacuum? I've changed the vacuum check valve on the firewall to no avail. It's a 2003 300 A. Any help appreciated.
SheriffbigD
'God Speed Blues Brother'
Originally Posted by sheriffbigd
Sounds like it may be solenoid issues with the EATC. Suggest you PM fastblackmerc for more info, he's our resident EATC expert.
2003 300B DBP
Build date: 6/19/03
Number 7,792 of 7,838 - 326 of 328
Proud member of the MM "BLUES" Bros.
Purchased: 11/10/05
Eaton swap by ImpalaSlayer 11-09-10
Semper et in Aeternum, Mercurius.
In Memory:
2004 DTR
Build Date 01/27/04
Purchased 04/04/04
Wrecked 10/19/05, R.I.P.
73 is the best number.
Very common problem. In fact, it's a sticky at the top of this forum: http://www.mercurymarauder.net/forum...ad.php?t=36922
The Blackbird
Trilogy #61
Driveway Queen
The Spruce Goose
2004 Grand Marquis LS Limited Edition
Daily Driver
BiRDMAN
I replaced my O-rings and A/C check valve and got full vent back but FLOOR and DEFROST still come out on the floor and defrost vents together.
2004 Silver Birch 300B
Build date:9/29/2003, Adopted on 12/02/05
Exhaust by Greg
13.630 @ 100.49 mph (11/21/10)
2015 Ford Focus SE Sport FWD
2013 Lincoln MKS EcoBoost AWD (377whp/423tq).
2010 Ford Fusion Sport FWD
1989.5 Ford Mustang 5.0 LXsport
Thanks for the info. I'll check out the o=rings in the EATC.
SheriffbigD
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