My car makes a squealing noise and thermostat varies.

SOURCE: Running Hot

Sounds like the water pump.Check if you see coolant or coolant residue behind the water pump pulley.

SOURCE: '90 Subaru Legacy overheating....

cool air and overheating point to low coolant level. Do you have a bleeder valve near the thermostat? You may have air trapped in the system. If no air trapped, the radiator may be plugged up not allowing proper circulation of coolant.

SOURCE: My 1990 subaru legacy lights up but won't turn over~not a sound.

your battery may not be charged enough to crank and start the vehicle or one of your cables may be loose so the connection is not there.

SOURCE: OVERHEATING!!!!

Since you changed your waterpump, you need to do an air bleed...
This is INSANELY important!
The airbleed is mounted on the top of the radiator on the passenger side.
Its made of plastic, has a seal, and looks like a 1/2 inch (12mm) philips screw head.
To do this, make sure the engine is cold and not running.
Use a large FLAT HEAD screw driver and turn it counter clockwise.
It might be very tight, so be prepared for a bit of torque to turn it!
Unscrew it, and look in the hole.
Coolant should be at the top of the bottom of the screw hole.
It should be low, so add coolant to the open hole.
While doing this, be sure the radiator cap is off so you can balance the fluid level properly.
Why do you need to bleed the system?
The engine has a slight tilt upwards toward the radiator, and both your waterpump, and block will have a tendancy to leave air near the top of the block and heads.
This is a common mistake on several makes after a coolant change.
Make sure all fluids are topped off, fill the overflow tank to its max level indicated on the tank itself and your done.
Provided you havent been driving long on the car in this condition, it shouldnt blow a headgasket.
A good way to know if the headgasket is bad is the radiator cap will have a brownish "slime" indicating combustion gasses are getting into the cooling system.
IF this is the case, your engine is pumping combustion gasses into your system and no amount of air bleeding with help.
Another tell tale sign of coolant being pressurized, is a overflowing "overflow" tank, and a sudden blast from Normal operating temprature to HOT, and then suddenly.. it goes back to Normal again.
There is usually a "gurgling" sound under your dash..
Lets assume you just need to do an air bleed, and things will go back to normal.
Also, if your airbleed screw has alittle coolant leaking around it, replace it with a new one as the seal and plastic have worn due to age.
Good luck!

SOURCE: 1997 subaru legacy L, 2.2L, temp gauge pegs

go to dollar store buy liquid themomitor put it in the fill cap check temp. gauge might be bad in car radiator mite be pluged