How do i replace a head gasket

On this website, you find fuse box diagram and description for Lexus ES250 (1990 - 1991)

Lexus ES250 1990 1991 fuse box diagram Auto Genius

did it throw a code? it could also be a crank or cam sensor or an ign modual

On this website, you find fuse box diagram, location and description for Lesxus ES250 (1990 - 1991)

Lexus ES250 1990 1991 fuse box diagram Auto Genius

this is a non-interference motor. Most likely it will not be damaged, replace belt and test by rotating the motor w/breaker bar!! Or you may do a compression test.

yes, a fuse and a relay usually under the hood in a black box.

I think because your searching for a pulley which is bolted to the AC clutch assembly. AC clutch bearing assembly is what you need

ES250, ES300, SC300 AF(DEXRON-IIE (R) Automatic Transmission Fluid) Differential is serviced separately in 1990-91 ES250 and 1994 ES300.
CAPACITY, Initial Refill*:

ES250 2.5 liters 2.6 quarts
Dry fill capacity: 6.5 qt. (6.2 liters)

every 60000 miles

THE WATER PUMP ON THE 1990 LEXUS ES 250 IS ON RIGTH SIDE OF THE ENGINE (PASSENGER SIDE) BEHAND THE TIMING COVER (PLASTIC COVER)

timing belt replace v6 engine turn the crankshaft clok wise slowly and make sure that nothing is stoping it for turning, until the key on the mark reach 12 o clok (TDC) the piston no 1 is att the top dead center .if the piston stop before reaching the top dead center ,,,,,one valve or two are open and the cam have to be ajust so dhat valve can close up,,,,,, so after the crank alignement ,the two cam marks at LEFT CAM 2 o clok right cam10 O CLOK ,,,note the belt slack must be on the tensioner side