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New Middletown, OH
liquid gasket sealer would be fine for anything as long as its not used on head gaskets or headers.
grab the heater hoses at the firewall and if one feels cooler then the other just flush it out with a garden hose,reconnect the hoses then check for heat.i would buy a $4 prestone hydrometer to check for boil over and frezze over protection also.
check for exaust restrictions.
most likely a clogged resonator pipe just before the cat converter.a sawzall a $10 replacement pipe and two clamps and your wories are most likely over.
it has a blend door accuator but i would try grabbing both heater hoses at the firewall.i f one is noticably cooler then the other then flush it out with a garden hose.then check your coolant with a hydrometer and you should be fine.
change the heater blower motor resistor.that part averages about $15 at local auto parts stores
gm recommends changing the filter and atf every 30,000 miles but you can go double that if its condition looks and smells ok
if your battery has at least 12 volts and all the lights,wipers,etc works ok but it wont crank over then the battery probably has a dead cell.not detectable by a multimeter.ask around about a battery load tester or most auto parts stores will check it for free.
if this odor is coming thru your vents then i suspect a mildew buildup.buy a can of lysol or any leading bacteria killing agent in an aerosol can,start your vehicle then set your blower motor on high fan.spray half the can into the intake vents just under your windshield wipers were leaves and pine needles allways buildup and switch from vent control to floor to defrost to get the disinfectant thru all vents.you may need the whole can and dont sit in the car during this process.also,leave the doors open so oders can escape and not cling to your interior uppolstry
thats the random misfire code.i bet your resonator pipe is clogged with junk cause the same thing happened to me.cut it off with a sawzall,buy a piece of flex pipe.2 clamps and youll have $20 bucks into it rather then a $700 exaust replace.if your gonna change the plugs the #3 plug will drive you insane.