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#618688 - 01/06/05 04:33 PM Fail-Safe Cooling
zephyr Offline

Registered: 12/09/04
Posts: 26
My 1998 Grand Marquis is equipped with Fail-safe cooling. The owners manual states that if the engine overheats four cylinders are deactivated and the disabled cylinders pump heat out of the engine. Also, if coolant temperature exceeds 330 degrees the engine will shut down. Sounds like a great idea if it works! Has anyone here had this feature activate on their own car? Was there any engine damage afterwards? Does Fail-Safe cooling give you enough warning? Thanks.....

#618689 - 01/06/05 04:41 PM Re: Fail-Safe Cooling
Allen Maty Offline

Registered: 06/27/04
Posts: 6560
Loc: Southern California
That is a great question! I've read about this, but I hope I never have to find out if/how it works!
'99 Crown Victoria LX HPP w/ Digi-Dash 11/2001-12/2011 Sold! Still on road with 219K miles as of 1/15
2012 Mustang GT Premium 5.0 6 Speed Man /w 3.73 LSD. wink

For Sale: Maurader Air Intake, Zip tube & 80mm MAF with matching BOC Custom Tune Chip and ECU computer (will fit '99-'00).

#618690 - 01/06/05 05:22 PM Re: Fail-Safe Cooling
gord_bolton Offline
Over the Hill

Registered: 05/06/02
Posts: 4691
Loc: Saskatoon, Saskatchewan
Last winter we had some extreem cold temperatures with -55F recorded at the airport. The radiator popped on my 98 CV and I drove about 12 blocks with the fail safe cooling mode activated. Not much of a test but it did work and there was no apparent damage. I have put about 60K miles on the car since. I believe the system alternates firing the cylinder every other cycle. It was like driving with the traction control on. No power and very little speed.

#618691 - 01/06/05 07:27 PM Re: Fail-Safe Cooling
GM_Guy Offline
Posting Addict

Registered: 12/17/00
Posts: 18406
Loc: London, Ontario Canada
The thing to remember is that failsafe mode is for you to baby the car to safety. Not to keep flying down the interstate with the flow of traffic, or keep driving around all day and finish your errands.
Some of the cylinders are shut down to keep heat down, the other 4 to give you some motion. Does it work? Yes. The critical point is that 330 degrees you mentioned, when you hit that, further operation will cause damage. Prior to that, you'll survice.

Box stuff in the Box forum!

#618692 - 01/06/05 07:37 PM Re: Fail-Safe Cooling
Raptor9458 Offline

Over the Hill

Registered: 04/19/04
Posts: 4994
Loc: Chicagoland
Yes it works, or at least activates. Mine kicked in when my electric cooling fan failed and caused an overheat. Only problem I've had with the car since is that I have to keep adding fuel.

#618693 - 01/06/05 08:22 PM Re: Fail-Safe Cooling
Warren'74 Offline

Registered: 06/13/02
Posts: 5363
Loc: Saskatoon, Sk. Canada
lol @ raptor!!
2004 CVPI - Ex RCMP Highway Patrol vehicle.

#618694 - 01/06/05 08:50 PM Re: Fail-Safe Cooling
ritcheyd Offline

Over the Hill

Registered: 06/23/01
Posts: 3473
Loc: West "By God" Virginia
Same as Raptor, cooling fan failed, baby-ed it home, no ac, pinged like crazy, no power but it did fine. Still a great engine, still had the plastic intake and still uses almost no oil. 98 CVPI with 124K miles.
2013 F150 XLT
2010 Grand Marquis
1971 Kaiser Jeep 2 1/2 ton

#618695 - 01/07/05 02:50 AM Re: Fail-Safe Cooling
1BADMERC Offline
Over the Hill

Registered: 08/31/04
Posts: 3645

Only problem I've had with the car since is that I have to keep adding fuel.

1993 GM LS
243k miles
29.5mm PI front bar(ENS greaseable poly bushings),21mm HPP rear bar(ENS poly bushings/endlinks),Mechanical Stewart-Warner oil pressure gauge. Black steelies/center caps...K&N filter

1994 Lincoln Mark VIII
144k miles
All airbags switched to coils/struts, junk tranny, motor donor car
Mercury Owners Group

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