AC/Heat: Full blast or nothing. - 3000GT/Stealth International Message Center

WARdriver · 09-20-2007, 01:04 AM

I have a 92VR4 with digital climate control. The AC blows cold, and the heat pumps out very hot. Only problem is that it only blows when the fan is on max. If I bump it down one notch, it stops blowing all together. Sort of a pain in the ass, because it's either all or none. Any ideas? Thanks,

Chris

Ownage · 09-20-2007, 03:40 AM

I vote for DCC Computer.

Second that motion??

WARdriver · 11-21-2007, 02:59 AM

Any other ideas? Still having the issue. Don't think it's the DCC computer, seems it may be mechanical. Also, possibly related, the right side of the display does not function (light up). Might pull the unit to inspect it.

Brick · 11-21-2007, 04:33 AM

There's a 2 relays that controls the fans. There's a high and a low. Your low is probably gone. They are in the engine bay. If that doesn't solve it there is also a connection to your a/c underneath the passenger side dash area that can get fried. I'm not an expert on the subject, just had the exact same thing happen to me. First my window controls went out. Before I bothered to fix it my a/c stopped, only full blast worked. Then that stopped too. Hope this helps.

WARdriver · 11-23-2007, 01:53 AM

Does anyone know where these 2 relays are located?

Quote:

Originally Posted by Brick

There's a 2 relays that controls the fans. There's a high and a low. Your low is probably gone. They are in the engine bay. If that doesn't solve it there is also a connection to your a/c underneath the passenger side dash area that can get fried. I'm not an expert on the subject, just had the exact same thing happen to me. First my window controls went out. Before I bothered to fix it my a/c stopped, only full blast worked. Then that stopped too. Hope this helps.

Brick · 11-26-2007, 04:40 AM

Engine bay. I think it's the small box on the driver's side, but just look on top of the fuse boxes. They are black with blue lettering.

Stealthee · 11-27-2007, 07:48 PM

Sounds like the rheostat on the fan. Its what controls the voltage going to the fan to control the speeds. It may be on the fan itself. I am not 100% as Ive never had to replace one on the Stealth.

VR4GSM · 12-18-2007, 09:23 AM

Quote:

Originally Posted by Brick

There's a 2 relays that controls the fans. There's a high and a low. Your low is probably gone. They are in the engine bay. If that doesn't solve it there is also a connection to your a/c underneath the passenger side dash area that can get fried. I'm not an expert on the subject, just had the exact same thing happen to me. First my window controls went out. Before I bothered to fix it my a/c stopped, only full blast worked. Then that stopped too. Hope this helps.

Sorry to bring up an old thread.. but im currently experiencing similar issues.

1st... the relays in the engine bay are for the radiator fan hi/lo, not the HVAC blower fan.

From my research its the resistor pack in the DCC controller computer that determines fan speed other than high.

My passenger side window controls have gone out as well, making me curious as to which a/c connection you're referring to, so that I may see if it is the culprit of my problems.

WARdriver · 12-18-2007, 11:53 AM

I checked all the fuses and relays (yesterday....finally got some time). All the fuses tested fine. I replaced the relays with known good ones. Still doesn't work properly. I think I mentioned it before, but all the lighting on the right side of my display is gone as well. I haven't removed the DCC yet, though. I just found out my clock spring is going so I'll need some downtime soon...might as well pull that too, and see what is looks like. Need to disable my ETACS while I'm at it.

As for the passenger window, the connections for that run into the driver side connection....so you'll just need to pull the driver side panel and (hopefully that's all it is) reconnect it. If that's it, you'll see it as soon as you pull the panel off.

So your heater/ac is doing the exact same thing? Only blows when it's up all the way?

Quote:

Originally Posted by VR4GSM

Sorry to bring up an old thread.. but im currently experiencing similar issues.

1st... the relays in the engine bay are for the radiator fan hi/lo, not the HVAC blower fan.

From my research its the resistor pack in the DCC controller computer that determines fan speed other than high.

My passenger side window controls have gone out as well, making me curious as to which a/c connection you're referring to, so that I may see if it is the culprit of my problems.

L_P · 12-18-2007, 05:57 PM

It is the transister fan blower pack, this does nothing but allow the DCC to step down the voltage to the blower. If the blower works only on full then that is typically the problem. There is a hi-speed rely for the blower on its highest setting all other settings go through the transister pack. If you need the diagram to its location I can post it. It is located behind the glove box up and out of the way a bit and goes into the housing, sorta behind the DCC panel but not really.
-John

EDIT: Digital climate uses a Transistor pack, the analog uses a Resistor pack.

09-20-2007, 01:04 AM	#1 (permalink)
WARdriver Trogdor strikes again! Join Date: Oct 2002 Location: Ramstein AB, Germany Drives: auf dem Autobahn Trader Rating: (21)	AC/Heat: Full blast or nothing. I have a 92VR4 with digital climate control. The AC blows cold, and the heat pumps out very hot. Only problem is that it only blows when the fan is on max. If I bump it down one notch, it stops blowing all together. Sort of a pain in the ass, because it's either all or none. Any ideas? Thanks, Chris __________________ 1992 3000GT VR4 K&N Intake, LS6 MAF and MAFT, DN Performance Y pipe, EK2 downpipe, Blitz SS BOV, Joe P MBC, Autometer Boost and Air/Fuel Gauge, Fuel Pump Hotwire, DSM 450cc injectors, EK2Fuel Rail Adapter, EK2 EGR blockoff plates, MSD Superconductor Wires, Shiver's Pocketlogger, Seattle Short-Throw Shifter Midnight Haze Black Face Reverse Indiglo Gauges, H4 Headlamp Conversion, OZ Wheels, EBC Greenstuff Pads, 3SX Stainless-Steel Braided Brake Lines, M-Spec Vacuum Reduction Kit, Redline Leather Shift Boot and E-Brake Boot, Greddy polished shift knob, 1600 watt audio system (Alpine CDA-9807, 2 10" Infinity Perfect subs, Smokin' VR4 custom dual 10" subwoofer enclosure, Kenwood Excelon KAC 810D, Lightning Audio digital capacitor) Needs to be installed: Maximal Performance solid motor and tranny mounts, Autometer EGT gauge, 255lph fuel pump, Test pipe, Topline Engineering Ground Wire Kit

11-21-2007, 02:59 AM	#3 (permalink)
WARdriver Trogdor strikes again! Join Date: Oct 2002 Location: Ramstein AB, Germany Drives: auf dem Autobahn Trader Rating: (21)	Re: AC/Heat: Full blast or nothing. Any other ideas? Still having the issue. Don't think it's the DCC computer, seems it may be mechanical. Also, possibly related, the right side of the display does not function (light up). Might pull the unit to inspect it.

11-21-2007, 04:33 AM	#4 (permalink)
Brick Forum Member Join Date: Apr 2003 Location: TX Trader Rating: (20)	Re: AC/Heat: Full blast or nothing. There's a 2 relays that controls the fans. There's a high and a low. Your low is probably gone. They are in the engine bay. If that doesn't solve it there is also a connection to your a/c underneath the passenger side dash area that can get fried. I'm not an expert on the subject, just had the exact same thing happen to me. First my window controls went out. Before I bothered to fix it my a/c stopped, only full blast worked. Then that stopped too. Hope this helps.

11-26-2007, 04:40 AM	#6 (permalink)
Brick Forum Member Join Date: Apr 2003 Location: TX Trader Rating: (20)	Re: AC/Heat: Full blast or nothing. Engine bay. I think it's the small box on the driver's side, but just look on top of the fuse boxes. They are black with blue lettering.

11-27-2007, 07:48 PM	#7 (permalink)
Stealthee Damage Control Join Date: Jul 2003 Location: 1 hr south of Pitt Drives: 1994 Stealth Trader Rating: (76)	Re: AC/Heat: Full blast or nothing. Sounds like the rheostat on the fan. Its what controls the voltage going to the fan to control the speeds. It may be on the fan itself. I am not 100% as Ive never had to replace one on the Stealth. __________________ Kbizzle [11:25 P.M.]: my ass is really sore Kbizzle [11:25 P.M.]: this is most displeasing

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12-18-2007, 05:57 PM	#10 (permalink)
L_P Woot! Join Date: Apr 2004 Location: Toledo OH Drives: '95 Dodge Stealth TT Trader Rating: (29)	Re: AC/Heat: Full blast or nothing. It is the transister fan blower pack, this does nothing but allow the DCC to step down the voltage to the blower. If the blower works only on full then that is typically the problem. There is a hi-speed rely for the blower on its highest setting all other settings go through the transister pack. If you need the diagram to its location I can post it. It is located behind the glove box up and out of the way a bit and goes into the housing, sorta behind the DCC panel but not really. -John EDIT: Digital climate uses a Transistor pack, the analog uses a Resistor pack. __________________ 1995 Dodge Stealth R/T TT, Dark Green ext, Dark Int, 1 of 20 available to the US. Mods: 13T turbos, FMIC 3" in/out, Spec Stage 3 clutch, RPS Billet Aluminum Flywheel, Gutted front and rear precat, test pipe, MSD 8.5mm SC Wires, 3rd Gen lifters, EGR Delete, 3SX EGR Block off plates, Blitz DD BOV, Hotwire Walbro 255 Fuel pump, Map ECU, Dual Pillar pod w/ AEM Wideband and AEM Tru Boost, Halo Hybrid Data logger, Supercar Engineering 1/2 billet aluminum Shift fork, fresh 1/2/3 friction rings, custom solid front and rear engine mounts, 3" Straight pipe exhaust single out. Looks: DCC Conversion, White face glow gauges. Sound: Infinity components up front, infinity 10" sub in back with Smokin' VR4 corner sub box, Pioneer HU. Myspace Must go faster project underway.