Question about 2002 Cadillac Deville

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My 02 cad deville leaking coolant from some sort of bypass hose located toward the back of compartment drivers side

Bypass hose for coolant

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Many Caddys have/had small "radiators" for heat to the rear passengers located under the front seats. Most shops (or owners) never check them or know they exist.

Posted on Oct 05, 2014

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Posted on Jan 02, 2017

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SOURCE: location for adding freon

add freon to low pressure side . low pressure side is large line with small fitting. high pressure line has a large fitting.

Posted on May 19, 2009

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SOURCE: 99 deville head gasket leak?

A head gasket leak is usually indicated (among other things) by continous overheating of the motor, and subsequent loss of coolant.
It can also be indicated by the presence of engine combustion gas bubbles in the coolant resevoir.
Ensure the coolant system has no external leaks, such as faulty hose/s, radiator etc.

Ensure motor tune or other motor mechanical condition is not the cause of overheating.
I assume the motor is actually running hot.

Check cooling fans are operating ok (as necessary when car warms up):- if not check
1) fuse,
2) relay operation,
3) heat sensor switch.

Check/replace the thermostat,
Check the coolant pressure cap is serviceable & of correct rating,
Ensure cooling system is correctly filled, bleed off any airlocks as necessary when re-filling,
Ensure radiator hose on suction side of waterpump is not collapsing at engine revs above idle (due softening),
If the motor has been severely overheated, the head gasket could be blown - look for combustion gas bubbles in the coolant resevoir.

Posted on Sep 21, 2009

Testimonial: "thx..my car is not overheating.only had to pull off road once.it does get to 233 sometime."

  • 15 Answers

SOURCE: Where is the coolant temp sensor located on 02

on the intake manifold near the thermostat housing

Posted on Apr 26, 2010

Testimonial: "Thanks....I've been looking for answers to this everywhere...."

  • 564 Answers

SOURCE: Flush radiator and cooling system on 1997 Calillac DeVille Concou

your radiator has a pecock on the bottom of it screw it out then you can run water through a hose behind it once it stops draining to get any residue out as far as the engine youll never truly get all of the old coolant out without tearing it down and putting it back together so flushing the radiator is just fine.

Posted on Jun 18, 2010

  • 1608 Answers

SOURCE: where is the ect(coolant) sensor

The engine coolant temp sensor is located just below the throttle body.Just remove the air cleaner tube and you should be able to see it.There will be a black and a yellow wire on the connector.Hope this helps.Good luck.

Posted on Nov 07, 2010

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1 Answer

Coolant leak in cabin - driver's side 2001 306 cabriolet - 2.0 16v


If you have a coolant leak in the car that is caused by a leak in the car's heating system - either the heater core or the associated hoses and connections.

Unfortunately to get at it is a PIA since it is behind the dashboard. A lazy fix is to stop coolant flow into the compartment and the leak will be gone along with the heat - bypass the heater hoses going to core .

Sep 11, 2015 | Cars & Trucks

2 Answers

Why is coolant leaking from underneath the center of my cadillac deville 1997? I've replaced everything that has to do with the coolant. There is no water nor fog on the passenger side floor


Well, if the coolant is leakimg from the HVAC drain, then you need a heater core, no matter what. You really have to jack it up and look, but I can give you a couple of pointers......

1. The water pump is leaking. That happens a lot. The coolant is leaking near the front of the car, near the center, but ever so slightly towards the drivers side. You need a special tool to replace it and I think gm has an updated cover and gasket.

2. The water pump housing is leaking. The gaskets that seal it to the block are made of plastic and deteriorate often. The coolant will be leaking at the center of the car, maybe up by the water pump, or back between the engine and transmission.

3. The heater hoses. I have only seen this 2 time, but the metal pipes corrode along the fire wall.

4. You could need a radiator. I have seen the side tanks leak a few times.....


Just A couple of places to look, but you have to get under and look....

Nov 07, 2014 | 1997 Cadillac DeVille

1 Answer

On my 96 deville i have a coolent leak coming from passenger side of engine towards the fire wall by front tire


Hello: Check the coolant overflow tank, the hoses and the metal pipes the hoses attach to. If there is bubbling in the tank after driving the you may be low on coolant or have a blown head gasket problem.

Oct 24, 2011 | 1996 Cadillac DeVille

1 Answer

Water leaking from back of engine compartment toward the firewall passenger side down to side of transmission so my question is it the bypass hose? or something else


More likely the heater hose. Most run back behind the glove box. It could also be a leak in the heater core- normally that would fog the windshield on the inside.

Feb 08, 2011 | 2001 Ford Expedition

1 Answer

Replace heater core


    A heater core transfers heat from a 1994 Ford Ranger's engine to the passenger compartment by running hot radiator coolant through a serpentine of tubing. Air blows past the hot fins of the heater core and into the truck cab.

    The hoses running to and from the heater core must be removed from the engine compartment, but the core itself is accessed from inside the passenger compartment, on the driver's side next to the center console.

    1. Turn off the engine, open the hood and remove the battery cable from the negative terminal. Make sure the engine is cool.

    2. Attach a 3/8-inch interior diameter hose to the drain outlet on the bottom rear corner of the radiator on the driver's side, and place the bottom end in a resealable plastic container. Turn the drain valve (located above the drain outlet) counterclockwise with a pair of pliers. Drain the engine coolant into the resealable container, then close the valve by turning it clockwise. Remove the hose from the outlet.

    3. Loosen the hose clamps on the radiator hoses where they attach to the heater core on the firewall. Remove the hoses.

    4. Unscrew the screws holding the underdash cover in place on the driver's side of the passenger compartment. Remove the underdash cover.

    5. Unscrew the four screws on the cylindrical heater core access cover and remove it. Remove the heater core by pulling it down and toward the rear of the vehicle. Replace the unit with a new heater core.

    6. Reinstall the heater core access cover and screw in the retaining screws. Replace the underdash cover and screw it into place.

    7. Replace the radiator hoses on the heater core in the engine compartment. Tighten the hose clamps. Add coolant until the level is between the minimum and maximum marks on the reservoir.

    8. Replace the battery cable and start the engine. Check the system for leaks.

Dec 05, 2010 | 1994 Ford Ranger Supercab

1 Answer

Coolant leak coming from the center of the car, under the engine


Looks like bypass hose or engine coolant plug just got leak! look at ur coolant reservoir, it might overflowing when ur engine heats up and its dripping towards the engine! Look and search all the hoses in the side of the engine and reservoir! If its the bypass hose, there will be a difficulty in removing and replacing it, but u could fix it! taah!

Nov 12, 2010 | 2000 Mitsubishi Eclipse

1 Answer

Water leak drips on leftside but is not from water pump. seems to come from back side and runs tword the front, shows wet down low and in back close to firewall.


There is a metal pipe on the back head that has coolant in it going to the heater core. Also there are also small rubber hoses (2) on the driver side toward the rear of the engine. Run your hand under the above listed items to see if you can feel coolant. If the above don't show any leak then it could be a head gasket leaking to the outside of the engine. Good Luck

Aug 31, 2010 | 1999 Cadillac DeVille

2 Answers

Leking water from back ner firewall not heter hose


The AC condensation drain tube is also located on the passenger side fire-wall towards the bottom of the fire-wall, it is there to drain the condensation from the evaporator/core plenum so that it does not flood the passenger compartment floorboard with water and it can easily be viewed from under the vehicle, and if it is cool clear water that is leaking and not hot coolant then you have no problem and that is a normal condition when the AC is operating.

If it was a coolant leak the cooling system would be low on coolant, and the engine would run hot when the coolant gets low.

Jun 11, 2010 | 1996 Cadillac DeVille

1 Answer

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

Oct 08, 2008 | 1999 Cadillac DeVille

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