Usually in housing at engine end of top radiator hose
If your heat and air conditioner doesn't work on your 1989 Cadillac Eldo and you have install a new compressor, check the thermostat. The thermostat may be stuck close or has gone bad.
The 1999 Cadillac thermostat can be found on the front of the engine. The thermostat will be inside of the thermostat housing. You can follow the top radiator hose directly to the thermostat housing.
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To replace the thermostat on a 1998 Cadillac, locate the area you will be working in. The thermostat is located at the rear of the engine on the drivers side. Then locate the upper hose. Remove the upper hose from the housing and disconnect the unit. You can then safely replace the thermostat piece.
Follow the top radiator hose to the engine block loosen the clamp that holds this hose you will then see 2 bolts on what is the thermostat housing the thermostat is in here. remove the 2 bolts pull it off the block and inside is the thermostat remove it and install a new one put things back in reverse way.