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Re: Engine smokes with AC on
to the weakness of your A/C, the engine has to work harder, which
causes it to heat more and causes the engine to smoke the fans try to dissipate all this heat.Your A/C is dirty already that can't work properly,due accumulated foreign matter,you better clean the A/C so it will operate normally...
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white 'smoke' may be condensation (steam)? Did it do this in the summer as well? Even with a warm engine and hot exhaust the steam will still condense after it leaves the tailpipe on cold days. Your fuel contains water at microscopic level which is vaporised as part of the combustion process.
Someone else's code may not help you as the light could come on for a number of reasons. Smoke under your hood could be due to a leak or leaks such as oil, coolant, power steering fluid and so on and as the engine gets hot the fluids will burn off on the hot engine or exhaust causing it to smoke. The smell when you turn the heat on could be because your heater core is leaking. This would be accompanied with low coolant levels, overheating and low heat especially at idle also the carpet may be wet. If your vehicle is equipped with a cabin air filter the smell could also come from there as leaves and other debris and sometimes even rodents can get in there. Also if you don't allow you evaporator to dry by shutting off the ac but letting the fan run for a couple of minutes the water on the evaporator can cause mold and mildew to grow giving you a funny smell as well. Hope this helps.
is the coolant level staying full or do you have to add ? the moisture in oil cap is normal for an engine that sets, condensation forms as the engine cools down.the smoke you noticed may have been moisture burning off the exhaust as the engine warms to normal operating temp. you need to drive the truck to see if it starts to overheat or run poorly. letting it set or just starting it up for a while will most likely not help find a problem.
Sounds like you've got a coolant leak. Check the condition of your radiator cap (look for deteriorated rubber, etc). You'll probably also need to top your coolant system off as well. It would help you if you pop the hood before starting the car, start the car and then watch the engine compartment so you can identify where the white smoke is coming from so you'll know what needs repair. No need to be a master mechanic to open a hood and watch an engine for 10-15 minutes... Also as a last resort if you're having overheating issues but need to drive in an emergency you can turn your heater on full-blast... the heater can act as a supplemental radiator (useful for when the engine fan fails), just turn it to max hot and max fan and roll the windows down as necessary. Turning off the AC and extra electrical accessories helps as well because it puts less strain on the engine accessories, which put additional strain on the motor as it tries to provide power to everything.
you need to check if its smoke or steam your head gasket may be failing and when you have the ac on the fans are helping to cool the engine .check your temp gauge when the ac is off also check if your loosing water