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GOLDCYLON · 09-21-2015

Having been there and done that its easier with the dash off on the 90-93 MYs. Best suggestion I can offer is to remove the targa top and pull the passenger seat to allow you to lay on your back and get some room to do the job.

I wont kid you its a complete PITA and a labor intensive job. I have not done this on the 94-95 ZR-1 since I havent owned one yet but the passenger airbag just adds to the complexity however its a simple unplug and move out of the way process.

Take a lot of pictures for reference along the way. If you do pull the dash be mindful of the weak area along the window on the passenger side which is very thin and can be brittle. It is best to have another person hold the drivers side of the dash while you negoitate this side out of the car.

Use this as an oppourtunity to clean the vents or consider a dash leather wrap upgrade opportunity

. Repair the foamy felts that surround the AC vents. I used to joke about the heater core being GM part 000000000001A and then the GM guys designed the rest of the C4 around it. Some GM Engineer is still prob laughing his AZZ off. GC

09-21-2015	#5
GOLDCYLON Join Date: May 2007 Location: Peoria, AZ Posts: 9,117	Re: Likely Heater Core Failure Having been there and done that its easier with the dash off on the 90-93 MYs. Best suggestion I can offer is to remove the targa top and pull the passenger seat to allow you to lay on your back and get some room to do the job. I wont kid you its a complete PITA and a labor intensive job. I have not done this on the 94-95 ZR-1 since I havent owned one yet but the passenger airbag just adds to the complexity however its a simple unplug and move out of the way process. Take a lot of pictures for reference along the way. If you do pull the dash be mindful of the weak area along the window on the passenger side which is very thin and can be brittle. It is best to have another person hold the drivers side of the dash while you negoitate this side out of the car. Use this as an oppourtunity to clean the vents or consider a dash leather wrap upgrade opportunity . Repair the foamy felts that surround the AC vents. I used to joke about the heater core being GM part 000000000001A and then the GM guys designed the rest of the C4 around it. Some GM Engineer is still prob laughing his AZZ off. GC __________________ GOLDCYLON - 91 ZR-1 #2014 GOLDCYLON - 90 ZR-1 #2794, 4L60e (Formerly Schrade's) GOLDCYLON - 11 CTS-V Arizona State Director 91 WHITE/BLACK #2014. 380 P&P&PCed,Ported Heads, Jeal Long tubes, Corsa Exhaust/FIKSE FM-5s /LED TLs, LED Headlights, Front Wilwood 6 piston narrowlite calipers and rear Wilwood caliper street shop mod,CNCed Coolant Pipes,TPI Cvr,Filter cover,Stainless Bolts, DRM/DOM PROM /ZFDOC mod build #102,DRLs,BMAD with stainless Debris Screen,Coplan Air Blaster, Pioneer APP Radio 4,Brey-Krause HB,Sub Bar,Fire extinguisher seat mount,DRM Coilovers,LEDs everywhere,Compass mirror (orange),V1 DIC hidden display, Homelink sun visor, Carbon Fiber top x3 and APSIS Carbon Fiber interior, APSIS CF Steering Wheel/NAPA Leather, Banski trailing arms, Guldstrand front suspension,urethane bushings from Prothane (total suspension) ZFDoc drive shaft safety loop, raptor shift light (orange),AO engineering louver front plate, Console seat cushion, 96CE seats with black custom Sheepskins, ss billet catch can,Viper remote entry/alarm,Cragar Rear Louvers,LED side louver lights, Dewitts Radiator with SPAL fans and a Woods 160 T-Stat 90 RED/BLACK #2794. 4L60e Automatic Stage V by RPM Transmission, TCI Dedicated TCM, OBX Stainless Headers, Corsa Exhaust, SAN Secondaries and Haibeck PROM, Exotic Muscle Coil overs, LED Interior Lights, LED Tail Lights, LED Headlights, 94 Sport seats with black custom Sheepskins , Cragar rear louvers, GS Front calipers, Banski Trailing arms, APSIS Carbon Fiber steering wheel, Front and Rear Baer Eradispeeds, DRLs, Guldstrand front suspension,urethane bushings from Prothane (total suspension), Dewitt's Raditor with Dual SPAL fans and a Haibeck 170 T-Stat 11 RED/GREY CTS-V Last edited by GOLDCYLON; 09-21-2015 at 01:54 PM.