1994 Cadillac DeVille Q&A
1994 Cadillac DeVille Question: What are other ways to find out if you have a bad thermostat?
Does your radiator fan work when you turn on the A/C, because it should. If not, repair your cooling fan. Does your car use any coolant? Has it been pressure checked over night to see if there is a weep hole leak in the water pump? The head gasket should also be checked for any leakage by checking for HCs and CO in the cooling reservoir bottle or you can use a block checking kit. I would have a pro do this to be sure of the results. - dandd
if your top hose is hot and lower hose is cooler your themostat is prombley bad - frank78