PotM GrandMarq.NET - Panther Headquarters Forum Index PotM
GMN Chat Room GMN's STORE!! GMN's Gallery Please!!
Results 1 to 6 of 6

Thread: no heat

  1. #1

    Default no heat

    89 G/M with auto climate control. Radiator full, fan blows on heat & def & vent. A/C works fine. I get no heat. It appears that the water is not going to the heater core. The hose does not get hot . Any suggestions? Thanks in advance. Gary

  2. #2
    Wagon Addicted Tiggie's Avatar
    Join Date
    Mar 2006
    Bedford, VA


    These cars have flow to the heater core at all times when the engine is running. If both hoses don’t get hot, You have a blockage or an air lock.
    1988 Crown Vic Wagon - daily
    1990 Country Squire - weekend cruiser, former lawn ornament
    Other: 95 Ranger, 74 F250, 68 Mustang, 94 Mustang
    Sold: 1982 LTD and 1987 Crown Vic

    GMN Box Panther History
    Box Panther Horsepower and Torque Ratings
    Box Panther Production Numbers

  3. #3
    2 decades of DDing Box Panthers, now in a Whale VicCrownVic's Avatar
    Join Date
    Nov 2012
    Shelby Township, MI


    Try flushing the heater core.

    If your hoses need to be replaced save one of the old ones to make a heater core flush adapter with a hose repair end from Home Depot.

    I had a clogged heater core that flushing would get me nice hot heat but it would reclog within a few weeks, so making the adapter really came in handy. Reclogging could mean that a full cooling system flush would be needed. Instead I replaced the heater core about 6 years ago and the heat still cooks in that car, and the heater core hasn't clogged since.

    ~ 1998 Mercury Grand Marquis LS - new DD
    ~ 1991 Mercury Grand Marquis LS "The Scab" - plenty of rot, summer DD
    ~ 1997 GMC Yukon - wannabe winter DD - returning summer 2020, I finally have an engine
    ~ 1991 Mercury Grand Marquis GS "The Ice Car" - My rotting winter DD
    ~ 1989 Mercury Grand Marquis GS - Rotting Retired DD
    Gone but not forgotten:
    ~ 1988 Country Squire ~ 1987 Ford Crown Vic

  4. #4


    Went out there today, got the motor hot, hoses going in and out of heater core were real warm. still no heat, went behind the glove box and watched the vacuum activate the door, it opened and closed, still no heat. Any more suggestions??

  5. #5
    I'm an air-conditioned gypsy gadget73's Avatar
    Join Date
    Jan 2005


    pull the clear hose behind the glovebox. that will force the blend door to full hot. If you still have no heat, the core is clogged.

    86 Lincoln Town Car (Galactica).
    5.0 HO, CompCams XE258,Scorpion 1.72 roller rockers, 3.55 K code rear, tow package, BHPerformance ported E7 heads, Tmoss Explorer intake, 65mm throttle body, Hedman 1 5/8" headers, 2.5" dual exhaust, ASP underdrive pulley

    91 Lincoln Mark VII LSC SE, triple black (Timewarp) - poly front bushings, KYB struts and shocks, Holley SystemMax1 lower intake, SilverFox AOD valve body,

    1984 Lincoln Continental TurboDiesel - rolls coal

    Quote Originally Posted by phayzer5 View Post
    I drive a Lincoln. I can't be bothered to shift like the peasants and rabble rousers

  6. #6
    Beater gonna beat sly's Avatar
    Join Date
    Mar 2010
    Lewisville, TX


    Also, check to make sure air is actually getting through the core. If it's all clogged with dust and fur/hair, it ain't gonna work either.

    Only two things are infinite, the universe and human stupidity, and I'm not sure about the former. -- Albert Einstein
    rides: 93 Crown Vic LX (The Red Velvet Cake), 2000 Crown Vic base model (Sandy), 2003 Expedition (the vacation beast)
    Quote Originally Posted by gadget73
    ... and it should all work like magic and unicorns and stuff.
    Quote Originally Posted by dmccaig
    Overhead, some poor bastards are flying in airplanes.

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
GMN Approved Links!

www.rockauto.com www.adtr.net