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You should look in the air handler( Where the indoor blower is located) or in the plenum (where the duct system originate at the air handler) for any dead and rotting rats. Residential central air systems are sealed (uses circulated air only) and do not use outdoor air.
Suppose you plugged the drain of the sink and filled the basin with water, then removed the plug. I must think that only after the basin empties you would get the sewer smell, and the smell would persist until you slowly ran some more water. If you try this, and this is the result, then the problem is that the sewer vent (that is supposed to prevent the water in the trap under the sink from being sucked down the drain) is not working right. If this is a new problem then you may be able to clear what is probably a blocked vent pipe. If this bathroom has always had this problem, then you have a poorly designed or executed vent pipe setup that you can only fix it with some surgery to your plumbing. However, to clean the vent you can try pouring a good bit of drain cleaner down the vent pipe on the roof, followed by water. But because there may be several vent pipes sharing the same vent stack out the roof, the drain cleaner may not get to your blockage and may simply go down a different path. Good luck.
Check the drain pan under unit. Maybe something has got in there. May need to remove the back our go through the front. Can pour a very small amount of bleach our Lysol to kill in the drain pan to kill mold. Hope that helps.
Was fuel smell present before you had fuel pump replaced? If yes I would sugest you drop tank and see if fuel vent hose is plugged forcing fuel back pressure line to vent through cap. If fuel smell was not present before you replaced fuel pump and seal. I would suggest you drop tank back out and check all fittings and hose conections. also if you still have old sending unit you could check to make sure they are exactly the same. As Sometimes you have to pull relief valve from old sending unit and install it in the new one, as some sending units wont have one in it. and some will have one that is regulated at a different fuel pressure. hope this helps Vic
Do you leave your climate control in the Auto position. This is bad. What happens is the evaporator which is located in the vents never dries out and you begin to grow mold. Does it smell musty, locker room type smell.
Also since it came out the heat vent it could also be a leaking heater core. Check you coolant level and reservior. If low this is an indication heater core is leaking. It may not of leaked enough to tell but usually these are the only reason the vents would smell unless a rodent ended up there and died.
Check the vent for clogging condition that will turn off unit and cause it to overheat. If vent goes up to roof check up there also - that is where mine was clogged with a sort of paper mache clog!!!!!
you can unplug the unit , and reomve the lower aces panel (3 screws along the front bottom of unit) youll probalby see an excess of lint built up in which case you can vacuum it out, and then check/clean and or replace your dryer vent
that job I haven't done yet. the smell you are getting is it a real sweet smell? If it is possible antifreeze leak. Beyond that I;m not really sure. Unless someone poured something down into the cowl vent. Do you get the smell when the ac is on with vents open or recirculator button pushed?