Question about 2001 Cadillac DeVille

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My 2001 deville is overheating. I have a new water pump and thermostat already installed. I have a new radiator to put in with my neighbors help. Can you tell me how to install the radiator and what tools I will need. Also any other ideas you might have as to why the car is overheating. The coolant gets too hot and comes spewing back out the cap. There isn't any coolant in the oil and the head gaskets seem to be fine. No weird noises or sounds from it. New hoses were put in last summer. This is why I think it could be the radiator causing the problems. Please help. Thanks.

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6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

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keemo68
  • 1263 Answers

SOURCE: 1990cad deville overheating

the first thing to check is to have the engine running. as soon as it reaches operating temp the upper radiator hose should get hot. if it doesn't then it's the thermostat. if it does then i believe your water pump is probably not circulating like it should and it should be replaced. however before replacing the wter pump make sure that the wire to sending unit is tight and not giving you a false reading. if your model has electric fans make sure the fans are running when the engine is hot. if they are not running check the relay in the fuse box for the fans with the engine running switch out the fan relay with the a/c clutch relay. ifthe fans kick on replay the relay with a new one. if they don't click on the it's either a bad wire or the temp sensor probe is bad. hope this answers your question. please rate this solution...thanks.

Posted on Aug 30, 2008

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dennymulford
  • 1055 Answers

SOURCE: 96 Deville Overheating....TroubleShooting

did you run a compression check? if so and its good then you have a blockage in the water jacket
if not then you have a head gasket leaking

Posted on Feb 26, 2009

r_mcalhoun
  • 166 Answers

SOURCE: 2000 cadillac deville check coolant message comes on but coolant

the sensor in the anti freeze bottle some times it sticks some times a light tap will loosen it up but some times you need to replace it

Posted on Apr 05, 2009

  • 534 Answers

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."

  • 784 Answers

SOURCE: engine overheating

The coolant flush on radiator doesn't do any good. Since you have changed all the key components and still gotten overheated, then the root cause of the problem is the radiator. It got clogged up in small tubes blocking coolant flow. No matter how good the water pump is working but the radiator got clogged up, coolant is not circulating therefore the heat from the engine can't be dissipated to the radiator. Replace your radiator, don't even think about rebuild it. It has been used for 11 years. Make sure to have the correct coolant/water ratio to keep radiator life for years. Good luck.

Posted on Dec 03, 2009

Testimonial: "Thanks, it was the radiator afterall. They claim hose was attached too tight; caused it to chip. I think I was taken for a ride by AAMCO & Valvoline."

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My 2001 pt cruiser limited over heated. It has already had a new radiator and both fans replaced with in the year. Should i now replace the water pump which is the original?


Overheating is caused by:
1. plugged radiator core
2. Wrong mix of water and coolant.
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4. stuck thermostat
5. hoses collapsing.
6. Air lock in system
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First, check to make sure your cooling fan is working, if not , could be fan motor , relay or temp sensor. if it is, it may be a clogged radiator?? start with these things first, they are the easest ...there are a lot more things it could be... that will be more involved (harder) to get into...Hope this helps you ?? Good Luck

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2001 Cadillac Deville 4.6L SFI DOHC 8cyl Removal & Installation procedure...

1. Before servicing the vehicle, refer to the Precautions section.
2. Drain the coolant.
3. Remove or disconnect the following:
Negative battery cable
Upper fill panel, if equipped
AIR injection control valve, if equipped
Air cleaner
Oil level indicator tube nut, if necessary
Water pump belt cover
Water pump drive belt
Lower radiator hose
Thermostat bypass hose from the coolant inlet housing
Water pump cover

4. Remove the water pump by rotating it clockwise using special Tool J 38816-1A (water pump remover/installer).

To install:

1. Install the water pump with a new O-ring, by turning it counterclockwise using the special tool, until it stops. Torque the water pump to 73 ft. lbs. (100 Nm).

  1. zjlimited_842.jpg

Fig. To ensure proper operation, be sure to install a new O-ring (click for zoom)

2. Install or connect the following:
Water pump cover. Torque the bolts to 89 inch lbs. (10 Nm).
Lower radiator hose
Thermostat bypass hose to the coolant inlet housing
Water pump drive belt
Water pump belt cover
Oil level indicator tube nut, if necessary
Air cleaner
AIR injection control valve, if equipped
Upper fill panel, if equipped
Negative battery cable

3. Refill and bleed the cooling system.
4. Run the engine and check for leaks.


Hope this helps (remember to rate this comments)

Mar 10, 2011 | 2001 Cadillac DeVille

2 Answers

Where do i find the thermostat and how do i replace it on a 2001 cadillac deville


The thermostat in the northstar engine is located at the bottom radiator hose (unlike most conventional cooling systems), the hose connects into the housing where you will also find the water pump.
Remove the hose from the housing,then remove the two bolts on the flange,the thermostat can then be pulled out.
Take note of the orientation of the thermostat as you remove it.
Don't forget the new gasket, you may have to order this separately.

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Believe it or not, new thermostats can be bad. Did you maybe get some adhesive on the thermostat preventing it to open fully? Is the thermostat installed with the crown up? The only other thing that I can think of, if it's a closed cooling system and the wrong radiator cap is installed, it won't hold the pressure, therefor overheating. The other thing may be the water pump. Many times the impellers will wear down internally causing to low of water flow.

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i remember trying this. if your water pump is faulty. while the engine is off, spin the radiator blade. if it spins, then your pump is out, if it stops immediately, (it has a cluth of sorts) it's ok. also use a lower degree thermostat, like 160 degrees, then it will open sooner.

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