Cooling System Issue
Thread Starter
Advanced
Joined: Apr 2016
Posts: 59
Likes: 4
From: Dallas Texas
Cooling System Issue
So I made the fateful decision of doing an HVAC servicing myself. I'm about halfway through and I'm at the firewall. I disconnected the heater core but when I try to pull it away from the firewall, it doesn't budge! What am I doing wrong there?
Apparently I also needed to disconnect the Evaporator Core but I have no clue how to drain the A/C refrigerant from it, and when I DO disconnect it from the firewall, it starts spewing refrigerant. Scanned the service manuals to no avail. Does anyone have a clue how to drain refrigerant in the '98 Corvette?
I'd appreciate any pictures, information, or tips you learned while working on your HVAC module. (I'm 17 and doing it all alone, so any help is really appreciated.)
Apparently I also needed to disconnect the Evaporator Core but I have no clue how to drain the A/C refrigerant from it, and when I DO disconnect it from the firewall, it starts spewing refrigerant. Scanned the service manuals to no avail. Does anyone have a clue how to drain refrigerant in the '98 Corvette?
I'd appreciate any pictures, information, or tips you learned while working on your HVAC module. (I'm 17 and doing it all alone, so any help is really appreciated.)
Burning Brakes
Joined: Nov 2011
Posts: 1,037
Likes: 120
So I made the fateful decision of doing an HVAC servicing myself. I'm about halfway through and I'm at the firewall. I disconnected the heater core but when I try to pull it away from the firewall, it doesn't budge! What am I doing wrong there?
Apparently I also needed to disconnect the Evaporator Core but I have no clue how to drain the A/C refrigerant from it, and when I DO disconnect it from the firewall, it starts spewing refrigerant. Scanned the service manuals to no avail. Does anyone have a clue how to drain refrigerant in the '98 Corvette?
I'd appreciate any pictures, information, or tips you learned while working on your HVAC module. (I'm 17 and doing it all alone, so any help is really appreciated.)
Apparently I also needed to disconnect the Evaporator Core but I have no clue how to drain the A/C refrigerant from it, and when I DO disconnect it from the firewall, it starts spewing refrigerant. Scanned the service manuals to no avail. Does anyone have a clue how to drain refrigerant in the '98 Corvette?
I'd appreciate any pictures, information, or tips you learned while working on your HVAC module. (I'm 17 and doing it all alone, so any help is really appreciated.)
Look around on YouTube - it is sort of my go-to.
Also, there may be some hard to find screw or clip or bolt, etc. that has to be freed to get the core out. It seems to happen to me all the time that there is one MORE fastener that I missed.
Good luck with your project
Thread Starter
Advanced
Joined: Apr 2016
Posts: 59
Likes: 4
From: Dallas Texas
I have not done this. But I seriously doubt that you have to disconnect the AC components to do this. The heater core should be connected to heater by-pass hoses.
Look around on YouTube - it is sort of my go-to.
Also, there may be some hard to find screw or clip or bolt, etc. that has to be freed to get the core out. It seems to happen to me all the time that there is one MORE fastener that I missed.
Good luck with your project
Look around on YouTube - it is sort of my go-to.
Also, there may be some hard to find screw or clip or bolt, etc. that has to be freed to get the core out. It seems to happen to me all the time that there is one MORE fastener that I missed.
Good luck with your project
Burning Brakes
Joined: Nov 2011
Posts: 1,037
Likes: 120
so detaching the core from the firewall (or wherever it is attached) does not necessarily mean disconnecting the hoses. At least, that is my thinking.
In any event, good luck as you move up the Corvette learning curve.
In any event, good luck as you move up the Corvette learning curve.
Tech Contributor
Joined: Dec 1999
Posts: 32,910
Likes: 2,402
From: Anthony TX
CI 6,7,8,9,11 Vet
St. Jude Donor '08
OH,,, YES you do. You MUST remove the Heater and AC lines from the fire wall.
Your SUPPOSE to recover the R-134. If you just vent it, you have to do it very slowly from the gas side of the system. If you do it wrong, you will vent the refrigerant oil out of the system along with the R-134.
NOTE. If you vent and open the AC System, you should replace the orifice restrictor tube, the receiver dryer and add the correct amount of oil for your compressor into the new receiver dryer. Then you need to vacuum put the system and add the exact amount of R-134 that it needs.
Your SUPPOSE to recover the R-134. If you just vent it, you have to do it very slowly from the gas side of the system. If you do it wrong, you will vent the refrigerant oil out of the system along with the R-134.
NOTE. If you vent and open the AC System, you should replace the orifice restrictor tube, the receiver dryer and add the correct amount of oil for your compressor into the new receiver dryer. Then you need to vacuum put the system and add the exact amount of R-134 that it needs.
Burning Brakes
Joined: Nov 2011
Posts: 1,037
Likes: 120
OH,,, YES you do. You MUST remove the Heater and AC lines from the fire wall.
Your SUPPOSE to recover the R-134. If you just vent it, you have to do it very slowly from the gas side of the system. If you do it wrong, you will vent the refrigerant oil out of the system along with the R-134.
NOTE. If you vent and open the AC System, you should replace the orifice restrictor tube, the receiver dryer and add the correct amount of oil for your compressor into the new receiver dryer. Then you need to vacuum put the system and add the exact amount of R-134 that it needs.
Your SUPPOSE to recover the R-134. If you just vent it, you have to do it very slowly from the gas side of the system. If you do it wrong, you will vent the refrigerant oil out of the system along with the R-134.
NOTE. If you vent and open the AC System, you should replace the orifice restrictor tube, the receiver dryer and add the correct amount of oil for your compressor into the new receiver dryer. Then you need to vacuum put the system and add the exact amount of R-134 that it needs.
