ugh...heater fan went out

JustJeff · 11-26-2010, 10:26 PM

Perfect time of year for the fan to stop blowing. Drove to my sister's for family thanksgiving and it worked. Drove home late that night and it did not work.

It wasn't giving any signs of problems. From what I've read it can be the fuse, the relay or the blower. It's not the heater core cause it does create ambient heat out of the vents that's still controlled by the logicon. I turn it to hot and ambient heat will rise out of the vents. Just no fan to push it.

Time to read the FSM.

One question. To replace the logicon do I need to remove the main speedo cluster to get to the harness plug? It's been a while since I messed with that stuff, but I do have a spare working logicon. I'd like to swap them and see what happens.

***TitaniumTT*** · 11-27-2010, 01:11 AM

Yes you have to pull the cluster to swap the logicon.

No you don't have to swap the logicon just yet. The blower will come down by itself. I'd drop that and start testing there, working my way back. Check power, check that the Logicon is sending the required signa, check grounds! I would do all that before pulling the logicon out.

JustJeff · 11-27-2010, 11:05 AM

^TTT

I'll probably end up scavaging whatever parts I need from the car getting a rebuild. Once I know whats wrong I'll replace and put that part in the turbo vert.

JustJeff · 11-28-2010, 04:52 PM

Problem fixed. I pulled the blower from the turbo vert and put it in the n/a.

My5ABaby · 11-28-2010, 11:17 PM

There's 2 ways to replace the logicon. The first you go through where the instrument cluster is to get to the stupid plug by the windshield. The other way you can pull the dash piece by the windshield and grab it from there. Both suck about equally much.

***TitaniumTT*** · 11-29-2010, 07:49 AM

Yup, I keep telling myself that I'm going to add a metri-pack or something inbetween that connector and the logicon, just never have...

FC Zach · 11-29-2010, 09:17 AM

Definitely a PITA x2. I replaced mine because the fan speed resistor went south and continued to where the fan eventually stopped working completely. I wrestling that for a day just to see later that night that none of the icons were illuminating! I'm still pissed about that and now I'm debating on whether I should remove it again to replace the bulbs or just carry a flashlight in the car.

JustJeff · 11-29-2010, 11:39 PM

I seem to remember needing to tie a string to the dash harness to keep it from falling behind the dash after unplugging the logicon? I swapped one years and years ago. I remember it being a PITA but don't remember the particulars of it.

My5ABaby · 11-30-2010, 09:08 AM

It's smart to tie a string to it so when you pull the logicon out the string comes so you can drag the plug back upon reassembly.

11-26-2010, 10:26 PM	#1
JustJeff RCC Contributor Join Date: Mar 2008 Posts: 505 Rep Power: 18	ugh...heater fan went out Perfect time of year for the fan to stop blowing. Drove to my sister's for family thanksgiving and it worked. Drove home late that night and it did not work. It wasn't giving any signs of problems. From what I've read it can be the fuse, the relay or the blower. It's not the heater core cause it does create ambient heat out of the vents that's still controlled by the logicon. I turn it to hot and ambient heat will rise out of the vents. Just no fan to push it. Time to read the FSM. One question. To replace the logicon do I need to remove the main speedo cluster to get to the harness plug? It's been a while since I messed with that stuff, but I do have a spare working logicon. I'd like to swap them and see what happens.

11-27-2010, 01:11 AM	#2
*TitaniumTT* Test Whore - Admin Join Date: Mar 2008 Location: Right Behind you son Posts: 4,581 Rep Power: 10	Yes you have to pull the cluster to swap the logicon. No you don't have to swap the logicon just yet. The blower will come down by itself. I'd drop that and start testing there, working my way back. Check power, check that the Logicon is sending the required signa, check grounds! I would do all that before pulling the logicon out. __________________ -The Angry Stig- DGRR 2009, 2011, 2012 & 2013 - Best FC DEALS GAP!! WOOHOOOO!!!!! 2015 Audi S4 - Samantha - Zero Brap S4 2004 RX8 - Jocelyn - 196rwhp, 19mpg fuel to noise converter 2000 Jeep Cherokee Sport - Wifey mobile - Now with 2.5" OME lift and 30" BFG AT KO's! So it begins 1998 Jeep Cherokee - 5 spd, 4" lift, 33" BFG's - Rotary Tow Vehicle 1988 'Vert - In progress 1988 FC Coupe - Gretchen -The attention whore BEAST! I'm a sick individual, what's wrong with you? I'm pure Evil I'm still insane, in the best possible way. I think Brian's idea of romance is using lube. Your rage caused the meteor strike in Russia. The Antichrist would be proud of his minion. You win with your thread. Most everything It's a truck with a steel gate on the back. Just a statement of fact Motec M820, AIM dash, ported 13B-RE Cosmo, 6-spd trans, 4.3 Torsen, custom twin wg fully divided mani, Custom 4" split into 2x 3" exhaust, Custom HMIC, Custom custom custom custom I like to welder stuff.... No Bolt-ons allowed. Dyno'ed @ Speed1 Tuned by me - 405rwhp on WG.... WM50 cuming soon. *-Angry Motherfcker Mode ENGAGED-**

11-28-2010, 11:17 PM	#5
My5ABaby Sigh..... Join Date: Feb 2008 Location: Murfreesboro, TN Posts: 2,377 Rep Power: 20	There's 2 ways to replace the logicon. The first you go through where the instrument cluster is to get to the stupid plug by the windshield. The other way you can pull the dash piece by the windshield and grab it from there. Both suck about equally much. __________________ 1986 Sport: 132k miles, 5A (Sapphire Blue Metallic), Tokico Blues, Racing Beat Springs, Custom LED tailights (only S4 LED tails in the world), SSR Mark II, Racing Beat exhaust, S5 black interior, Rotary Resurrection rebuild at 120k miles Community Service Manual RotorWiki "Imagination costs nothing; we could build square locomotives or fly to Mars" - Felix Wankel Yesterday is history, tomorrow is a mystery, but today is a gift. That is why it is called the "present."

11-29-2010, 07:49 AM	#6
*TitaniumTT* Test Whore - Admin Join Date: Mar 2008 Location: Right Behind you son Posts: 4,581 Rep Power: 10	Yup, I keep telling myself that I'm going to add a metri-pack or something inbetween that connector and the logicon, just never have... __________________ -The Angry Stig- DGRR 2009, 2011, 2012 & 2013 - Best FC DEALS GAP!! WOOHOOOO!!!!! 2015 Audi S4 - Samantha - Zero Brap S4 2004 RX8 - Jocelyn - 196rwhp, 19mpg fuel to noise converter 2000 Jeep Cherokee Sport - Wifey mobile - Now with 2.5" OME lift and 30" BFG AT KO's! So it begins 1998 Jeep Cherokee - 5 spd, 4" lift, 33" BFG's - Rotary Tow Vehicle 1988 'Vert - In progress 1988 FC Coupe - Gretchen -The attention whore BEAST! I'm a sick individual, what's wrong with you? I'm pure Evil I'm still insane, in the best possible way. I think Brian's idea of romance is using lube. Your rage caused the meteor strike in Russia. The Antichrist would be proud of his minion. You win with your thread. Most everything It's a truck with a steel gate on the back. Just a statement of fact Motec M820, AIM dash, ported 13B-RE Cosmo, 6-spd trans, 4.3 Torsen, custom twin wg fully divided mani, Custom 4" split into 2x 3" exhaust, Custom HMIC, Custom custom custom custom I like to welder stuff.... No Bolt-ons allowed. Dyno'ed @ Speed1 Tuned by me - 405rwhp on WG.... WM50 cuming soon. *-Angry Motherfcker Mode ENGAGED-**

11-29-2010, 09:17 AM	#7
FC Zach RCC Loves Me Not You Join Date: Mar 2008 Location: Eagleville, TN Posts: 2,267 Rep Power: 20	Definitely a PITA x2. I replaced mine because the fan speed resistor went south and continued to where the fan eventually stopped working completely. I wrestling that for a day just to see later that night that none of the icons were illuminating! I'm still pissed about that and now I'm debating on whether I should remove it again to replace the bulbs or just carry a flashlight in the car. __________________ 1993 Yamaha GTS1000 1992 Celica Turbo AllTrac 1987 RX7 Sport 1979 Yamaha G1, KM24 powered 1975 Dolmar KMS4

11-27-2010, 11:05 AM	#3
JustJeff RCC Contributor Join Date: Mar 2008 Posts: 505 Rep Power: 18	^TTT I'll probably end up scavaging whatever parts I need from the car getting a rebuild. Once I know whats wrong I'll replace and put that part in the turbo vert.

11-28-2010, 04:52 PM	#4
JustJeff RCC Contributor Join Date: Mar 2008 Posts: 505 Rep Power: 18	Problem fixed. I pulled the blower from the turbo vert and put it in the n/a.

11-29-2010, 11:39 PM	#8
JustJeff RCC Contributor Join Date: Mar 2008 Posts: 505 Rep Power: 18	I seem to remember needing to tie a string to the dash harness to keep it from falling behind the dash after unplugging the logicon? I swapped one years and years ago. I remember it being a PITA but don't remember the particulars of it.

11-30-2010, 09:08 AM	#9
My5ABaby Sigh..... Join Date: Feb 2008 Location: Murfreesboro, TN Posts: 2,377 Rep Power: 20	It's smart to tie a string to it so when you pull the logicon out the string comes so you can drag the plug back upon reassembly. __________________ 1986 Sport: 132k miles, 5A (Sapphire Blue Metallic), Tokico Blues, Racing Beat Springs, Custom LED tailights (only S4 LED tails in the world), SSR Mark II, Racing Beat exhaust, S5 black interior, Rotary Resurrection rebuild at 120k miles Community Service Manual RotorWiki "Imagination costs nothing; we could build square locomotives or fly to Mars" - Felix Wankel Yesterday is history, tomorrow is a mystery, but today is a gift. That is why it is called the "present."