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The DRAIN hose coming out of the firewall is the A/C condenser drain line. It is a drain hose and is draining condensation from the A/C coils, which is normal with the A/C on. You may also be seeing a drain line for the window cowl area. Now if you are talking about either the inlet or outlet hoses going to the heater, then you more than likely just need to replace them.

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โˆ™ 2006-03-23 14:40:08
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Q: What could be causing a bad coolant leak on a 2000 Chevy Cavalier if a drain hose coming out of the firewall is leaking?
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