I would have to ask exactly what you're smelling. If it's exhaust, you have an exhaust leak somewhere where it's able to get into the HVAC ducts - exhaust manifolds are a likely culprit here. You'll need to repair the leak.
If it's electrical, your blow motor is probably burning out. You'll have to replace it.
If it's a moldy smell, you have mold on the evaporator and/or in the ductwork. Get some anti-mold spray. Run your vehicle with the AC on high (but NOT on Max AC - you need fresh air intake), spray it into the intake ducts underneath the wipers, and run the AC for ten minutes afterwards. For the evaporator, get some of the foaming anti-mold spray, and spray it into the vent by the passenger door. Repeat as needed until the smell goes away. To help prevent it from happening again, make sure you shut your AC off a few minutes before you shut your vehicle down.
Cuz it runs on diesel or your cat is shot, sorry bud.
It's on the verge of vapor lock.
Give your filters a thorough cleaning out. If you still have the manual or instructions, consult them.
You probably should investigate that. Nobody here can help you.
car smells of gas inside and out
It has a leak in the Cooling System Somewhere, It might have a cracked Head or a Blown gasket
Conditioner is a type of shampoo which leaves the hair softer. you have it for all type of hair and styles. also different smells.
It smells
Give it a bath (no chemicals like shampoo or conditioner, just regular water)or give it to the vet to get cleaned.
make be there is a gas leak
If your car smells of petrol inside, and you have not been using a petrol-like solvent to clean something inside the car, you probably have a fuel leak and should have the car checked by someone able to detect and fix a leak.
A smell inside is usually a bad evaporator coil.