Engine oil going to radiator is a cylinder head problem.
Either
1. Cylinder head gasket burnt
2. Cylinder head bolts not tight enough
3. Cylinder head cracked
4 Cylinder head warped.
Remove cyliner head and pressure test it for cracks. If cracked replace unless someone near you can repair effectively. If not then skim and you might as well do a complete cylinder head service ie valves, stem seals etc. Put back head with new gasket and torque correctly and be surprised with the results.
SOURCE: changing the thermostat 2000 cadillac deville
The pressure they work within is usualy information on your radiator cap or owners hand book.Your thermostat should be a 180 degree but can vary The 180 is in reference to the heat required to open them so water can flow through and be kept at a more or less constant 180.There are other temp ranges for a wide variety of applications and 180 is the standard one for most vehiclesThe radiaor and water system is pressurised to lower the boiling point of the water The higher the pressure the lower the boiling point
SOURCE: overheating 1999 cadillac deville
THIS SOUNDS CRAZY BUT, ON SOME OF THE OLD SCHOOL CARS, THEY HAVE A CLUCH FAN.. AND IF ITS BAD, THE CAR WILL OVERHEAT WHEN DRIVING AND COOL DOWN AT IDLE.. I DONT THINK THE CADY HAS A CLUTCH FAN, BUT I BET ITS IN THE FAN.. GOOD LUCK KEITH..
SOURCE: whath does "service engine soonmeans"
SERVICE ENGINE SOON and SERVICE ENGINE NOW are 2 amber warning lights pertaining to the vehicles computers.SERVICE SOON advises you of a problem, although not an emergency should be attended to promptly. Your technician can trace the problem by accessing fault codes through the climate control panel. SERVICE NOW indicates a more severe problem which will most likely precipitate a failure / breakdown. The CHANGE OIL LIGHT indicates by time and mileage is a separate light.
SOURCE: 1999 Cadillac Deville and the radiator fans are not coming on
you should check the fuse in the fuse boxe under the hood and find the radiator fan fuse
if the fuse is no longer good the little piece of metal will be cut in the middle so replace it with the same number if it's a 20 AMP do not put a 30 or a 15 AMP
if the fuse is good then there might be some problem with wires (could be cut) or the radiator fan motor is no longer good
you should have it check
Good luck
SOURCE: cylinder 6 misfire for 2000 cadillac deville 4.6 liter engine
check out this tool. Brand new on the market and it quickly can diagnose a misfire from the plug or the coil pack. Here's their website
Fig. Thermostat and housing-typical
Hope helps.
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