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#1592464 - 10/24/08 05:18 AM Heat not working
mkfanatic Offline
Climber

Registered: 11/04/05
Posts: 724
Loc: Hamilton, OH
I turned on my heater for the first time this year since last winter and it isn't coming out hot or even warm. It's coming out quite cool. I last replaced my heater core about 4 years ago. I don't think they go bad that fast do they? I don't have any steam coming out of my vents though like what happened last time my heater core went bad. Could it be something else?
_________________________
1993 Crown Victoria P74 (wrecked)
1995 Crown Victoria P72 (sold to junkyard)
Mods: P71 Computer
2003 Crown Victoria P74 Sport
Mods: MM MAF + Airbox and K&N Air Filter, 04 Zip Tube, 3.73 gears with trac-lok LSD, AMMC Driveshaft, Tailshaft w/ Forced Lube Mod, and 93 Tune from Lonnie @ BOC

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#1592469 - 10/24/08 06:01 AM Re: Heat not working [Re: mkfanatic]
P71CVMAN Offline
Over the Hill

Registered: 07/09/07
Posts: 4827
Loc: wIScONSiN
I'm not sure what your dash looks like in '93, but if its close to my '01. You can take the instrument & radio surround off the dash. Then look down the vent hole(flash light) to the right of the radio and see if the blend door is moving when you turn the switch from cold to hot. It should close towards you when you have the switch turned for heat. You might have to put the ignition key in the accessary position.
Do you have a temp gauge other then the stock gauge? Your thermostat could be bad, not allowing the car to warm up fully?
Or you could have what I just had a bad heater core. My heater core's fins were all expanded and not allowing the air to pass through it.....so no heat!
If your blend door is operating right, then I would start with a new thermostat and a good flush of the system.

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#1592544 - 10/24/08 08:31 AM Re: Heat not working [Re: P71CVMAN]
cvpimaster Offline
The Irish ignore anything they can't drink or punch
Over the Hill

Registered: 12/06/04
Posts: 2046
Loc: North America
Dash is completely different. Is the temperature gauge on the cluster reading normal under typical driving conditions?
_________________________

2004 CVPI
2006 Jeep Grand Cherokee Ltd.

Originally Posted By: btsom
If you can't remember if you had a good time, throw your shorts at the ceiling, if they stick, you had a good time.

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#1592629 - 10/24/08 09:33 AM Re: Heat not working [Re: mkfanatic]
Steve83 Offline
Poobah

Registered: 10/03/04
Posts: 7445
Loc: Memphis, TN 38002, USA, Earth,...
 Originally Posted By: mkfanatic
I turned on my heater... It's coming out quite cool. I last replaced my heater core...
Lack of heat indicates nothing about the heater core. It indicates lack of coolant INSIDE the heater core.
_________________________
Walk softly & carry a BIG SIX ! ! !

. . .

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#1592675 - 10/24/08 10:42 AM Re: Heat not working [Re: Steve83]
Chevyguy Offline
Poobah

Registered: 01/04/04
Posts: 8367
Loc: Winchester Mass
Or the lack of movement by the BLEND DOOR

Dash has to come off for either job, make sure what is going on first
_________________________
2004 MarauderM79 104K miles Jmod!! Lidio 93 tune for the track BOC 91 octane street tune 14.85 @95.63
2004 Crown Vic LX 145K Silver Birch Light flint leather FMX1 04 P-71 PCM swap 70 mm TB Custom shorting wire harness. 28/ 21mm MM swaybars Monroe severe duty shocks. Marauder subwoofer and painted cap heated mirrors. GT-500 Wheels NEED DUAL EXHAUST


Project car 74 Chevy Laguna type S-3, # match 400 SBC

Previous rides
93 P-71 2001 P-73, 94 TC Exec, 96 TC Signature

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#1592873 - 10/24/08 01:13 PM Re: Heat not working [Re: Chevyguy]
LTDteether Offline
Over the Hill

Registered: 07/19/02
Posts: 4450
Loc: Democratic Rep. of Southpaw
With the car at normal operating temp, the control at full hot and the blower full on, feel the heater hoses. Feel both of them. Are both hot? If not, your heater core is clogged.


Edited by LTDteether (10/24/08 01:14 PM)
_________________________
'99 GM GS HPP.
I may not be a rocket scientist, but I *am* a scientist.

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#1593836 - 10/25/08 01:44 PM Re: Heat not working [Re: LTDteether]
chazmo67 Offline
Member

Registered: 09/06/02
Posts: 302
Loc: Peabody, MA
My father has a no heat problem with his 97 MGM. The heater hose are both hot. So it's the heater core or blend door?
_________________________
Chazmo67
03 Grand Marquis
J-MOD, upgrade to factory dual exhaust, underdrives, 70 mm Accufab TB, P&P Plenum, JLT Cold Air Intake

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#1594150 - 10/25/08 10:34 PM Re: Heat not working [Re: chazmo67]
cvpimaster Offline
The Irish ignore anything they can't drink or punch
Over the Hill

Registered: 12/06/04
Posts: 2046
Loc: North America
I'm betting on the blend door. Always cold right?
_________________________

2004 CVPI
2006 Jeep Grand Cherokee Ltd.

Originally Posted By: btsom
If you can't remember if you had a good time, throw your shorts at the ceiling, if they stick, you had a good time.

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#1595339 - 10/27/08 09:55 AM Re: Heat not working [Re: cvpimaster]
chazmo67 Offline
Member

Registered: 09/06/02
Posts: 302
Loc: Peabody, MA
Always cold. Is this an easy fix?
_________________________
Chazmo67
03 Grand Marquis
J-MOD, upgrade to factory dual exhaust, underdrives, 70 mm Accufab TB, P&P Plenum, JLT Cold Air Intake

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#1596243 - 10/28/08 09:14 AM Re: Heat not working [Re: chazmo67]
cvpimaster Offline
The Irish ignore anything they can't drink or punch
Over the Hill

Registered: 12/06/04
Posts: 2046
Loc: North America
No not really, search for blend door repair, its an intensive job requiring removal of the entire dash. Might as well pay someone to do it, it will cost you about 700 buck though \:\(
_________________________

2004 CVPI
2006 Jeep Grand Cherokee Ltd.

Originally Posted By: btsom
If you can't remember if you had a good time, throw your shorts at the ceiling, if they stick, you had a good time.

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#1619516 - 11/21/08 05:42 PM Re: Heat not working [Re: cvpimaster]
mkfanatic Offline
Climber

Registered: 11/04/05
Posts: 724
Loc: Hamilton, OH
Well, I replaced my heater core, replaced the thermostat, and topped off the anti-freeze cuz it was low and none of that worked. My heat is still not working which is really frustrating after replacing the heater core. That was a tough job seeing how I couldn't fully remove the dash. Very frustrating.
_________________________
1993 Crown Victoria P74 (wrecked)
1995 Crown Victoria P72 (sold to junkyard)
Mods: P71 Computer
2003 Crown Victoria P74 Sport
Mods: MM MAF + Airbox and K&N Air Filter, 04 Zip Tube, 3.73 gears with trac-lok LSD, AMMC Driveshaft, Tailshaft w/ Forced Lube Mod, and 93 Tune from Lonnie @ BOC

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#1620435 - 11/22/08 06:16 PM Re: Heat not working [Re: mkfanatic]
mkfanatic Offline
Climber

Registered: 11/04/05
Posts: 724
Loc: Hamilton, OH
By the way, the blend door opens and closes just fine.
_________________________
1993 Crown Victoria P74 (wrecked)
1995 Crown Victoria P72 (sold to junkyard)
Mods: P71 Computer
2003 Crown Victoria P74 Sport
Mods: MM MAF + Airbox and K&N Air Filter, 04 Zip Tube, 3.73 gears with trac-lok LSD, AMMC Driveshaft, Tailshaft w/ Forced Lube Mod, and 93 Tune from Lonnie @ BOC

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#1625301 - 11/28/08 11:54 AM Re: Heat not working [Re: mkfanatic]
blackops_1 Offline
Member

Registered: 09/07/03
Posts: 145
Loc: Benson, NC
Sounds like it has an air pocket maybe?
_________________________
98 P71, 4.6L, tilt,ac,no cruise, 263k miles

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