OK - just replaced mine. Stand facing the front of the car. Go to the right side and find the air filter assembly. You may want to get a light to see better. The PCV is about "2 o'clock" from the air filter under a bunch of stuff. It's tight, but look for the general shape of the new PCV valve you are using the replace. Bottom part fits into an approx. 5/8" hose and then there's another smaller hose on the side (keep the one from the old valve as you will need it with the new one). Just pull on the old valve to get it out from both connections and replace with the new one. Took 10 minutes TOPS and is very easy.
Answer
The PCV on a FOUR CYLINDER is located on the block in the CENTER of the front. It is hard to find and it is on a metal tube that is BEHIND the thermostat. The thermostat housing MUST BE REMOVED AND THE BOLT THAT HOLDS THE TUBE TO THE HEAD MUST BE REMOVED, after that, pull on the tube and the PCV is on the end which inserts into its place on the block. I found this myself after asking three so-called mechanics.
were is the iac locate on a 1999 mercury mystique
IN the Middle!¬
Through the schrader valve on the low pressure side.
The thermostat for a 1999 Mercury Mystique is inside of the top water inlet. Remove the top radiator hose from the engine, and then inlet can be removed to get to the thermostat.
In the fuel tank
Low on back side of engine block.
near fuel thank
The passenger compartment fuse panel is located on the driver
below the fog lights there is one on each side
Yes , the ELECTRIC fuel pump is inside the gas tank on a 1999 Mercury Mystique
According to the 1999 Mercury Mystique Owner Guide : ( 58.5 liters / 15.4 U.S. gallons )
The thread on cap on your engine coolant reservoir is the pressure cap / radiator cap on a 1999 Mercury Mystique