Question about 1999 Cadillac DeVille

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I have a 2000 cadillac deville

My 2000 cadillac deville overheats when I am driving around 75-80 miles an hour for in about 10 minutes, I turn on the heat and it will cool down, it is a NORTHSTAR 4.6 ENGINE, I put a new radiator in it because I broke the intake on it trying to tighten a hose.

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  • Anonymous Mar 24, 2014

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You can rent a cooling system preasure tester at a parts store. These engines run so close to boiling that they must be able to hold presure or they overheat. Presurize the system and check for even the smallest leaks at all hose connections. I fought this problem for a long time before I figured it out.

Posted on Nov 20, 2008

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The most common problem with overheating is the Fans on the rad don't come on when they should. The relays have to be replaced from time to time. Also if you put in a new rad, it's likely you have an air lock in the system. Other problems could be the thermostat or the water pump. Runn the engine until it comes up to temperature, shut the engine off and check the coolant level. Sometimes you have to do this several times to get all the air out of the system.

Posted on Jan 24, 2016

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1 Answer

2000 cadillac deville is overheating, replaced thermostat: water pump radiator had head gaskets fixed it's saying check coolant level and it spews coolant from the overflow tank cap when hot thoughts?


Two cooling fans controlled by three relay's . If only one fan is working ,that could be a problem .
Coolant Level Sensor Description
The coolant level sensor monitors the coolant level in the cooling system and indicates if the coolant is low. This sensor is located at the base of the radiator surge tank and is not serviceable.
CHECK COOLANT LEVEL (2)
The IPC receives a discrete input from the engine coolant level switch. The engine coolant level switch is normally closed. When the engine coolant is low, the engine coolant level switch opens. When the IPC receives an open signal from the engine coolant level switch, the IPC displays the message on the DIC.

Relay Driven Dual Cooling Fan Diagnostics There are using a pontiac , by your cadillac is the same .

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93 Deville, 4.9L, 113k miles. I'm a decent mechanic (have replaced engines, heads, etc.). The latest problem is an intermittent stall. The first time it happened the car was driven for 10 mins then...


Now you can do the Fuel Pump

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Did you drive with a fuel pressure gauge,
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Got a good fuel filter

Looking won't help you

Always do some type of testing,
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i would get a radiator tester to make sure there is no air leaking out at a slow rate

May 05, 2010 | 1996 Cadillac DeVille

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Are cooling fans working? if so when they do work, the air coming through the radiator should be HOT, ROASTING AIR, if not the radiator isnt flowing coolant.how does it run after sitting all night at first start, does it run rough 5-10 seconds? if so, may have head gasket issues. BIG BUCKS........

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1998 Cadillac DeVille Overheats


The cooling fans will not come on until 225 degrees. Normal temp is around 199-215. Sitting still in traffic most will inch up around 220 or so. When you turn ac on it turns the fans on and may cool down engine, Check fan operation.

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May 18, 2009 | 1996 Cadillac DeVille

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