1998 Cadillac DeVille Questions

Unanswered 1998 Cadillac DeVille Questions

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the codes are - chech engine , service steering systen , lost siglal from bcm , abs light on and codes po151-po174 and traction control light. and the horn keeps blowing so i took the relay out and switched it with an...
How do you replace an egr valve
passenger side when the air conditner is turn on. ?????
When I turn ignition,nothing,reads anti theft engaged
Acts as if there's a short in the left turn signal, said that the battery voltage is low and that there is a security problem car may not start
I have been unable to locate the drain plug opening to flush and drain the radiator on a 1998 Cadillac Deville, 4.8 cu.in., 32 Valve Northstar. Any way you can help me locate the plug with picture or diagram.
I also can smell something burning or a sound like it grinding