Question about 2002 Cadillac Deville

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I have a 2002 Cadillac deville northstar 4.6L in the morning when it's cold it starts and runs great but after about 30 mins if I cut it off it will not idle unless my foot is on the gas pedal. I've c

Should I do a vacuum check with a gauge. whats up doc.?

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The over heating start with flush radeator

Posted on Aug 12, 2014

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Dec 29, 2015 | Cadillac Cars & Trucks

1 Answer

1996 deville runs then doesn't?


You need to find out what is missing when it won't start , spark - ignition system or fuel pressure . No Start Diagnostic Basics EricTheCarGuy

Apr 18, 2017 | 1996 Cadillac DeVille

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My 2000 cadillac deville keep running hot when i drive it.the coolant shoots out the coolant tank when i open it.i changed the radiator and the thermostat.i don't think a head is blown cause it dosen't...


OK, check that the 2 fans are turning on when it gets to operating temperature. If not, replace the 3 or so relays that control the two speed fans on your car.If that doesn't solve the problem, then you may have to buy new fan motors and also have the harness replaced if necessary to make it cool reliably.

I had this problem on a 1997 Cadillac Deville Limousine that overheated over 157 deg. F and went into its limp mode for cooling the engine off by allowing 1/2 of the cylinders to circulate fresh air into the engine in case all antifreeze would leak out or the car would overheat.

Don't run the Northstar engine too long, more than 45 min. at a time in this limp mode.

Good luck on this repair of your Northstar Engine.

Jan 02, 2011 | 2000 Cadillac DeVille

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My Cadillac Deville, 2002 northstar is running hot........or the temp gage goes up and I have to stop driving..I have a new thermostat,relay switches for the fans,temp control sensor and a new coolant...


Check the fan to see if it is going on. On my 1997 Cadillac Deville Limousine I had to have the 2 fans, and 3 relays replaced, as well as the wiring contacts for the relays at an auto electric shop for about $700 last fall, but it has been running cool since then.

Dec 31, 2010 | 2002 Cadillac Deville

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2002 Cadillac DeVille, AC/Heat blower not blowing out air


Have you tried smacking the blower motor? If it starts running after you hit it, replace it.

Aug 20, 2009 | 2002 Cadillac Deville

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97 deville northstar was running fine now wont start


The faulty component was the fuel pump relay.

Apr 18, 2009 | 1996 Cadillac DeVille

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96 CADI TURNING OVER BUT WILL NOT FIRE


check for spark when it turns over, have some one listen to see if your fuel pump runs when you turn the key on, check to see if you have fuel pressure, check to see if you have compression

Feb 15, 2009 | 1996 Cadillac DeVille

2 Answers

Intermittent High Idle, Dies on cold starts, bad mileage


These cars are notorious for intake manifold leaks. This could also be a throttle position sensor. If you have a MIL (check engine light) I would scan it with an OBD II scanner and pull the relevent code off the scanner it will give us a much more accurate direction to proceed

Feb 01, 2009 | 2002 Cadillac Deville

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