I have a 1999 mercury cougar. I just got a new fan belt put on and now when my engine gets hot, the fan cuts on and will not cut off. The only time it cuts off is when I turn the ignition off. Another problem is that my heat works great but my air want work at all. I took it by the shop but I was told there were no leaks in any of my lines. Someone please help i'm running out of solutions and money.

You mean the engine will crank over but won't start an run ! Does it have spark ,is it getting fuel ? You need to find out what is missing ! If no spark , it could be crankshaft position sensor ,coil pack , PCM etc.. No fuel pressure , fuel pump , electrical - fuel pump relay ,inertia fuel cut off switch ! A lot of thing's can cause this ! No Start Diagnostic Basics EricTheCarGuy

Head gasket or white smoke could be trans fluid if it could get into engine from a trans vacuum line if there is such on a 1999.

There is a square hole in the belt tensioner
for a long ratchet to pull off the tension

Should be 1/2"

To remove the belt after you make a diagram or have one FIRST,
you can cut the belt to get off

You will need to have the Ford dealer run an active engine running test with a scan tool to see what fault shows up.

Hello and welcome to FixYa!
I may not recommend a bypass on the compressor's wiring. This can lead to wire burning and may damage the vehicle's electrical system (which usually happens during bypass). If you can get one on the junkyard then it's better plus you can cut the cost.
Hope this helps and thank you for using FixYa! Have a good one!

I had this problem with a different car, they kept giving me **** rebuilt alternators, I think I put on like 10 before I made them upgrade me for free to a lifetime warranty one.

The wire harness for the crank senser can get into troble and make a crasy cut out miss stumble, You may have to remove the senser and unplug it, Remove the lagging cover and inspect the wire by bending it. (bends easy it's broke ). The break can be in the wire past the plug on the engine harness the wire gets hot and brittle or even oil soaked as the oil transmits heat better than air and makes the insulation get hard quicker. Lots of different cars and other engines ( chainsaws, Lawnmowers , boats, Motorcycles) Your car is old and the wires are too.

put it around every thing except the smooth pully and slide it on be sure u got the right belt

My 1999 Cougar started running hot and I took it to my mechanic and he found that the water pump belt was broke. Replaced belt and all is well. Hope this help.

If the fan motor is blowingthen this is a sign that the fuse is good, if it's not then check the fuse, or you may need a new fan. as for not blowing heat it could be that the gate valve in the heater lines is stuc closed for some reason, or you could need a new thermostat. as for fuse slots 5 & 6 I am not really sure for your car as I would need to see the fuse panel and what accessories you have. Good luck and remember to rate all the solutions you get, thanx.