i have a 2000 deville with about 137000 miles on it and just the other day i was driving and after about an hour the temp guage went up to hot....car basically died....i let it cool and chked all the fluids...everything full and o.k. no busted hoses, nothing i could see wrong...drove back hame and again aprox 1 hour later same thing but check engine light never came on.....could it be a sensor? you guys here are great with these tech. questions.. can someone please help me?

 

Sticking thermostat always possible. Infrared gun would be handy in diag. How hot were hoses?,when condition occurred.

 

sorry i forgot to let you know i took it to a backyard mechanic and he said everything seems to be normal..he said thermostat is working fine...he was the one that said that it might be a sensor or something electrial...he is a older guy that really dosent work on cars with a lot of electrial equip. but he gave it a once over since we are live next to each other

 

If it overheated or ran hot then coolant was not doing it's job. If thermostat is ok then perhaps water pump is gone bad or malfunctioning.

 

can it go bad overnight...reason for this question is it ran fine the day before and then the next day problem started and the length of time before it starts acting up

 

have you read the thread in our FAQ on the subject of oeverheating?
It is a great place to start.

The car died? IF it shuts down, something is seriouly in need.

 

Put on the heater full blast. If you get heat water is circulating through system and pump is fine. If low heat or no heat impellers are corroded and pump is done. You might also see some leakage from the seep hole on the water pump cover left front of engine.

 

https://www.cadillacforum.com/m_7193/tm.htm


https://www.cadillacforum.com/m_9792/tm.htm


much advice there ......