Q: Where is the thermostat located on a 1991 Lexus ES 250?

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The thermostat on a 1997 Ford F-250 is located under the upper hose assembly in the radiator. To locate the thermostat, drain the radiator halfway and remove the hose at the top of the radiator.

sounds like your thermostat might be sticking open ( or wrong or no thermostat )

Would have been built for R12, can be converted to R134a.

Is it a six cylinder . That would be on the thermostat housing.

The curb weight of the 2007 Lexus IS-250 is 3455 lbs..

The 2006 Lexus IS-250 has a drag coefficient of 0.28 Cd.

The 2010 Lexus IS-250 is 15 ft. 0.3 in. (180.3 in.) long.

The 2013 Lexus IS-250 has a drag coefficient of 0.28 Cd.

The 2011 Lexus IS-250 has double overhead cam (DOHC).

The 2009 Lexus IS-250 has double overhead cam (DOHC).

The height of the 2006 Lexus IS-250 is 4 ft. 8.1 in. (56.1 in.).

The curb weight of the 2009 Lexus IS-250 is 3455 lbs..

The curb weight of the 2010 Lexus IS-250 is 3455 lbs..

The 2006 Lexus IS-250 is 15 ft. 0.1 in. (180.1 in.) long.

The 2007 Lexus IS-250 is 15 ft. 0.1 in. (180.1 in.) long.

The 2009 Lexus IS-250 is 15 ft. 0.3 in. (180.3 in.) long.

The height of the 2010 Lexus IS-250 is 4 ft. 8.1 in. (56.1 in.).

The curb weight of the 2006 Lexus IS-250 is 3455 lbs..

The 2011 Lexus IS-250 is 15 ft. 0.3 in. (180.3 in.) long.

The curb weight of the 2013 Lexus IS-250 is 3435 lbs..

The 2007 Lexus IS-250 has double overhead cam (DOHC).

The 2014 Lexus IS-250 has double overhead cam (DOHC).

The height of the 2014 Lexus IS-250 is 4 ft. 8.3 in. (56.3 in.).

The curb weight of the 2008 Lexus IS-250 is 3455 lbs..

The 2013 Lexus IS-250 has double overhead cam (DOHC).