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Below is a collection of Jim Grant's Tech Tips sorted by Vehicle Make. These Tech Tips were answers to questions submitted to Jim by ALLDATAdiy.com users over the course of many years.
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  Jim Grant's Tech Tips

'94 Chevy Cavalier, Heater Core Drain

Q: My sister in law came to me the other day; she has a ‘94 Chevy Cavalier. She said anti-freeze was pouring out the bottom of the motor. I took a look at it, and it was coming out of a spout inside the firewall where the A/C lines go to it, had a 90 degree elbow coming off of it, with nothing attached to it. Where is the other end to this spout? Is it on the motor? I was thinking it was the heater core, but most if not all the heater cores I've seen only have 2 hoses coming from them. I found the 2 hoses; they are hooked into 2 spouts at the firewall. They didn't make a 3rd spout did they? This can't be an overflow, because if you start it up, it will drain all the fluid out of the radiator and engine. I have been looking and looking as to where this thing goes. Looks like there was a hose of some sort on it and it went somewhere, but I just can't find out where. It’s her only transportation.

A: The spout you are referring to is the drain for the A/C evaporator. When a heater core fails coolant will exit through the A/C drain. To get her up and going quickly you can by bass the heater core by hooking the 2 heater hoses together. This will allow her time to plan for the time and cost of the repair.

 
     
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