20 Most Recent 1997 Cadillac DeVille - Page 6 Questions & Answers

just follow the top radiator hose back to where it connects to engine and there right next to that is the sensor

could take several days , what really needs to happen is a complete cold/hot/cold transisition needs to happen x 10 to purge out air from system , if your getting lots of air in system you might have a problem with your head gaskets , this is a very common problem with these engines , the overflow bottle keeps bubbling when running is a sure sign that head gaskets are in need of repair

if this is the one with the flouresent lighting (soft blue glow) , this means the tubes are going bad , sorry only way to fix them are to replace the instrument cluster , the tubes are built inside

A thermostat is mostly a bimetallic part that will open the waterway from the radiator to the engine block when the temperature is high enough. This has nothing to do with the hose. However, if the hose is swollen then I'd suggest you change it asap as it sounds like it's about ready to burst.

Depends on ambient winter temp, brand of coolant etc. 50/50 of volume would be a starting point. Your owners handbook usually gives volumes in the spec page.

IM HAVING SAME PROBLEM EVEN AFTER REPLACING THE ALTERNATOR AND BATTERY

If seal/tape goes bad it can leak..I suppose if something is cracked sensor can appear to leak..if temp gauge seems to work and u think sensor threads leak reapply some thread tape and put in.. If gaugedoesn't work then maybe sensor is bad/crackedt

If you cannot find a ground wire between engine and firewall or wing then make a 12 gauge wire and terminal to engine and firewall metal

The temp sensor may be going out or you may have a bad ground between the engine block and the body of the car.

Robert , not really if you do disconnect battery MAKE SURE YOU US A MEMORY SAVER ,its a small battery supply that plugs into cig lighter and keeps all data fresh .did you check tention on water pump drive belt, ,is water pump good ,and after replacing radiator did you purge out all the air.,iknow these north star motors very well and keeping a good handle will keep it alive for years but these motors have a BAD track record of over heating and blowing head gaskets . Woody

Robert, it controls cooling fans and gives you a temp reading on dash

For my 1997 Cadillac Deville limousine with 4.6 L Northstar it should be 196 to 205 deg. And top out at no more than 230 deg. F. Check multispeed fans for high speed turning over and antifreeze fluid level in overflow tank. Also, check for head gasket leaks through tailpipe which will show up as steam when you start the engine.

a north star engine has aluminum heads anything over 212 is not good and has the posibility of warping the heads to leak resulting in failure of engine normal temp sholuld be about 160 +/- 10

Thermostat would probably be wide open around 85-90 degrees. Pressure cap limits boiling temp to about 105.

the coolant temp sensor lets the cars computer know that the engine has warmed up and to allow the fuel injection to go to what is called "closed loop mode" this is where max fuel econ and low emmisions are available , the driver can know car is not in closed loop mode by the higher idle that cpu adds to allow car to warm up faster also on cadillacs/buicks only it lets the air condition system go to open vent where it allows fresh outside air to be drawn in to cabin

Depending on where you live in the country, 212 isn't to hot. Your high temp fans don't come on until 225-230. And what you described sounds normal as there is pressure in the system at 124.

The capacity is around 3 gallons, but if you drain it I would say two gallons will be enough to fill.

Coolant should be mixed in most cases to a 50% concentration, meaning one gallon of undiluted coolant will provide two gallons of diluted coolant. Most engines will hold 2-3 gallons of coolant mix. I normally purchase two gallons of undiluted coolant. I pour the first gallon of undiluted coolant into the radiator, then fill the empty bottle with water and add that to the radiator as well to make it a 50% mix.. Then, I pour half the second bottle of undiluted coolant into the empty coolant bottle, and then top both off with water to make two gallons of 50% mix. I then add coolant to the radiator as needed until full, keeping the remainder for topping off later as air purges itself form the system.

Buy it premixed. Easier that way. or just do a 50/50 mix.

When the gasket blows, it may allow coolant to get into the oil. Pull the dipstick, if you see a change in oil colour and an increase in oil level, the gasket leaked. As for noise, ask the dealer.