ac leak and tach meter problem
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Joined: Feb 2005
Posts: 52
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From: Houston TX
ac leak and tach meter problem
I have my crossfire 82 vette for two months and was able to diy several projects with the help of our friendly forum. My next projects are the tach meter and also the ac.
By the blower under the dood, when I turned on my ac, cool air are leaking back through the blower and ito the engine compartment (passenger side under the hood). Before I open the sucker up, I just want to make sure I am not going to create any more problem. Please advise.
As for my tach meter, it works ok except when the ignition is in the off position. The needle pointed to 800 rpm when the ignition key is at the off position. It would zero out when the ignition is switch to on.
Thanks for helping.
By the blower under the dood, when I turned on my ac, cool air are leaking back through the blower and ito the engine compartment (passenger side under the hood). Before I open the sucker up, I just want to make sure I am not going to create any more problem. Please advise.
As for my tach meter, it works ok except when the ignition is in the off position. The needle pointed to 800 rpm when the ignition key is at the off position. It would zero out when the ignition is switch to on.
Thanks for helping.
Le Mans Master
Joined: Aug 2001
Posts: 7,804
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From: Standing still with all my might Texas
Cruise-In X Veteran
St. Jude Donor '09-'11
There is a small rubber hose (about 3/4" diameter, and 2" long) that goes from the AC evaporator box to the housing of the blower motor. It is there to route air to the motor for cooling.
Just a stab in the dark, but it is possible that your's has come loose.
If your hose is still in place and/or the air leak is in another location you will probably need to pull the evaporator box off and re-install with a seal kit. This is a big job!! You will have to pull the passenger side exhaust, the AC compressor, the AC hoses, the receiver-dryer, and the passenger side and center dash. If you do have to go to all this trouble I would also suggest that you install a new heater core while you are in there, it might just save you from having to do it again in another year or so.
Sorry, I can't help with the tach but I'm sure someone else will chime in.
Just a stab in the dark, but it is possible that your's has come loose.
If your hose is still in place and/or the air leak is in another location you will probably need to pull the evaporator box off and re-install with a seal kit. This is a big job!! You will have to pull the passenger side exhaust, the AC compressor, the AC hoses, the receiver-dryer, and the passenger side and center dash. If you do have to go to all this trouble I would also suggest that you install a new heater core while you are in there, it might just save you from having to do it again in another year or so.
Sorry, I can't help with the tach but I'm sure someone else will chime in.
Thread Starter
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Joined: Feb 2005
Posts: 52
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From: Houston TX
Kevin, is the 3/4" hose you talked about locates inside the evaporator box? I found a rubber seal for the evaporator inlet hanging on the inlet line and re-installed it. This seemed to stop any cool air from comming out. Does this resolve my issue?
As for removing the evaporator, do you know of any online guide with photos to do this? I like to research this prior to tackling the problem. I checked corvettedfaq and they did not seem to have anything relating to a/c evaporator. Any help is appreciated. Thanks Kevin
As for removing the evaporator, do you know of any online guide with photos to do this? I like to research this prior to tackling the problem. I checked corvettedfaq and they did not seem to have anything relating to a/c evaporator. Any help is appreciated. Thanks Kevin
