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HIZNHRZ · 09-21-2015

Thanks all. I'm thinking after a couple of hours of disassembly I'll be able to determine if removal of the existing Heater Core without removing the dash pad is feasible. I'm not sure I have anything to lose by giving it a try. At the same time, please let me know if you have first hand experience and don't think this is going to work!

GC, sounds like you've done this on a 1991 ZR-1. My car is a 1991 also. I'd be real interested in your thoughts on the likelihood of succeeding without removing the dash. I do understand there will be problems with a couple of mechanical connections that will be difficult to see without dash removel. For these connections, I'm planning to use a fiber optic inspection camera as a work around.

Jim, I understand you're busy. I might take you up on pressure testing the system if you think it makes sense. I'm just not sure what else would result in the symptoms I'm experiencing other than the heater core. The symptoms are:

- vapor and condensation on the windshield at and between AC/Heat setpoint temperatures of 60 and 90 degrees.
- vapor clearly smells like antifreeze.
- unmistakable antifreeze puddle in the plasitic passenger side footwell.

Thanks again for any thoughts or suggestions.

09-21-2015	#10
HIZNHRZ Join Date: Apr 2004 Location: Germantown, MD Posts: 732	Re: Likely Heater Core Failure Thanks all. I'm thinking after a couple of hours of disassembly I'll be able to determine if removal of the existing Heater Core without removing the dash pad is feasible. I'm not sure I have anything to lose by giving it a try. At the same time, please let me know if you have first hand experience and don't think this is going to work! GC, sounds like you've done this on a 1991 ZR-1. My car is a 1991 also. I'd be real interested in your thoughts on the likelihood of succeeding without removing the dash. I do understand there will be problems with a couple of mechanical connections that will be difficult to see without dash removel. For these connections, I'm planning to use a fiber optic inspection camera as a work around. Jim, I understand you're busy. I might take you up on pressure testing the system if you think it makes sense. I'm just not sure what else would result in the symptoms I'm experiencing other than the heater core. The symptoms are: - vapor and condensation on the windshield at and between AC/Heat setpoint temperatures of 60 and 90 degrees. - vapor clearly smells like antifreeze. - unmistakable antifreeze puddle in the plasitic passenger side footwell. Thanks again for any thoughts or suggestions.