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Hi, I'm Tim and I'm an HVAC expert here to assist you with your questions. Please provide all information I request as it makes it more difficult to troubleshoot something when I'm not there onsite. Essentially, you become my eyes and ears. Thanks for the opportunity to help. At the end of our dialog, you will have a chance to rate my service, but please wait until we are finished and you're satisfied you have all the information you need.
More than likely the front cover over the secondary heat exchanger has cracked or possibly one of the drain hoses is leaking. Given the age, this is very likely. Does this happen with air conditioning or just with the heat?
Some things to check: check your furnace filter, should be clean, check the fitting that comes off the coil and goes to the drain hose-rinse and clean out both drain hose and fitting. If all these things are OK, more than likely the coil pan has a crack or hole in it and will need to be replaced.
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