I have a 2002 cadillac deville northstar v8 with 106,000 miles & the coolant keeps bubbling back up out the coolant resovour after i changed the thermostsat. Its not leaking frm anywhere else, ive had the car since feb 2012 & its oct 2012 never had any problems until now, the heads are not leaking. i jst want to knw whats causing it to bubble back up out the coolant resovour

Ginko

• 19396 Answers
• Posted on Jun 08, 2008

SOURCE: car leaking coolant

First of all ensure that your car is leaking coolant fluid, and what is dripping is not just water condensation from the air conditioner.
If you have a coolant liquid leak, it can be from one of the ducts leading to radiator , from water pump or radiator itself. Check liquid levels, and if you have a leak have the car inspected by a qualified mechanic.
A broken water pump, for example, can cause your motor to blow in few miles.

Marvin

• 85242 Answers
• Posted on Oct 08, 2008

SOURCE: 2002 Cadillac Coolant sensor

The engine coolant temperature sensor is located on the driver side of the engine near the rear of the engine compartment

SOURCE: codes po174/171 cadillac deville northstar engine

These are the trouble codes description, well some what gives you a start where to look for... Auto zone will give you a print out of your codes for free in dallas...



P0170 - Fuel Trim Bank 1
P0171 - Fuel Trim System Lean Bank 1
P0172 - Fuel Trim System Rich Bank 1
P0173 - Fuel Trim Bank 2
P0174 - Fuel Trim System Lean Bank 2
P0175 - Fuel Trim System Rich Bank 2

Marvin

• 85242 Answers
• Posted on May 09, 2009

SOURCE: 1997 cadillac deville water pump

it is on the front of the engine see photo

SOURCE: Cadillac Deville 2000- Engine check light code P0741

If you like go ahead and let someone sell and replace your transmission but here is my suggestion! Check around and see if you can find a minor vacuum leak! This can simply be the big round hose that goes from the fuel injection to the power brake hub! This is normally a push in connector which has about a 1/2 inch hose clamped on it! If there is any kink or the connector is not in correctly a leak will occur and the transmission will shift rough as though you will be thrown out of the vehicle! Try unplugging this connector and plug it back in hard and straight and maybe you will be lucky and fix your problem. If the vacuum is correct your transmission will shift better than you have ever experienced!