2003 Mercury Mountaineer no heat

It is never as straightforward as you think because the entertainment system is monitored and run by the body control module and put warning chimes and things like the blinker clicker through the audio system.

https://www.google.com/search?q=2003+Mercury+Mountaineer+radio+and+entertainment+wiring

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Here you go........

https://www.2carpros.com/questions/mercury-mountaineer-1997-mercury-mountaineer-firing-order

https://www.justanswer.com/mercury/6604r-mercury-mountaineer-2000-merc-mountaineer-v8-awd.html?__cf_chl_jschl_tk__=bbdbbbd251dcaf0d223c7729cef468700f284312-1611184040-0-AVeIHfZ8RmCycIou7H5xWIlsxfihqLjvVne6YZy5iuHMUahR9XlH29FV68MiYM8U9Mjy2hmzDsiiaA0h1RBOv78xXhLLd-ZuiFJG0G0-18ux6rBNpsk3N5lstNwynG8Uiwsy0bH9PuMnD3zT2OIeLuXOZBwE-AWcVoCyb2yqlGlEnYtE3EvF0jpONUAuqShMJrUQ32dYpDjVrkVc_2QbjKTeomjzDAK5QfqrAviS54lcIniLUgSXdRExtYQ4SHmQuUmsz_d-e3tPhyFJcE6Yadm5pX9J3TuMlEzAGwQOlaoc8_qB46Ire1OVA2ySQ6YOap4pHqEKF1ixo7Otuh_lId6EPm9N6tXGcBiI8ml8OBIMpzRROiQ-jXe75USAzEZtUNbF1GDjMls7tfASq5MFD8B3qxkI5xDTzm3x-RE0MMNFW281KpqWdQq3siBaqCMTP9cAgihVyZC6KNTcjUoCOqc

1,2,3,4, Passenger Side
5,6,7,8, Driver Side


1&5 are at the front of motor

The Engine Temp. sensor is bad. it is under the intake manifold. if there is a miss also check under the coils over the spark plugs. If there is Coolant in the spark plug holes .then the intake gasket is leaking. The intake manifold needs to come off to change the coolant sensor. When off look for corrosion on the cylinder head at the coolant port. If there is corrsion then the cylinder head must be replaced.

Replacing a transmission can run $1,800-$3,500
I'm thinking closer to $2800 for you because it is a more sophisticated AWD model, perhaps more. Hope that is informative enough for you.

Please rate me, thanks!

Depends I had a whole new used one put in for 1300...I had the front diff replaced 2x and the front driveshaft 2x a Drive shaft by shaftmaster is about 340. Some type of frame tweakage that throes it off. Always make sure you have the same tread on your Mountaineer if you have AWD.

the problem is the chain inside strechs, could cause case damage, it will soon break and then truck wont move, depending on how bad it is you may be able to drive a bit more, threres just alot of strain there because of it being awd, if it is noisey it doesnt have to be replaced just fixed,good luck.

If its the heat shield against the underside.its install with fender style aluminum rivets( if you do it be very careful not to drill into a harness) If its the heat shield around the CAT then you should replace the cat. You can try to repair it with a pair of long hose clamps but I don't advise removing it. In the wrong environment the heat could cause a grass fire. or ignite trash that may get caught or blown underneath. Good luck.