Question about Cadillac Eldorado

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Overheating caddy! Restricted flow from the top of the block. What I have done. New thermostat, engine coolant sensor, New hose's top, bottom and by passed heater core. Removed all hose's and radiator ,top flushed block, replaced water pump, reservoir flushed. System flow and hoses new and flow works when tested engine off. Engine get warm and back flows in to reservoir with air and air in lines flowing with water in system.

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You don't say what year caddy. but older models (especially the 4.1L) did have a problem with intake manifolg blockages and gasket leaks. if that sounds like it could be your problem try replacing the intake manifold gasket, and clean out the inside of the manifold while it's off either manually, or by having it put in an acid vat at a rebuild shop or napa center

Posted on Sep 08, 2010

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3 Answers

Hi my camry 300sei boil the water out but the haetgage seems ok when I open the rediotor cep the water is empy and the car is warm can u please help!!!!


When cold fill the radiator with water and leave the cap off. Make sure that you have all the air out.
Start the car and watch the radiator, you are looking for air bubbles coming out of the radiator. If you have a steady stream of bubbles appearing you have a blown head gasket.

Feb 25, 2015 | Toyota Camry Cars & Trucks

1 Answer

Why is temperature guage of nissan wingroad very high?


I would assume it is because either a) your engine is getting very hot, or b) your temperature sensor is going bad. The way to test would be to use an infrared thermometer to see the engine temperature. Does the car shut down on your while you are driving?
If the engine is getting very hot, it is probably because your coolant isn't flowing properly or your radiator is blocked by a plastic bag or something.
Once you confirm that your radiator isn't blocked, check the level of the coolant in the reservoir and in the radiator. It should be full to the top of the radiator. If not, add coolant (you should check for a leak if it is seriously low).
If there is enough coolant, you may want to check that your thermostat is opening. This would be as simple as checking if both the top and bottom radiator hoses are getting hot. If they are both hot, then your coolant is flowing through the thermostat.

Check these three things (radiator not blocked, radiator has enough coolant, and both top and bottom radiator hoses getting hot) and then reply with what you have found.
My bet, without seeing the car, is that your thermostat is stuck closed and it needs to be replaced. This is a $10 fix. Buy a new thermostat at Autozone or another parts store, and replace the old one (I'll explain how if it comes to this.)

Mar 05, 2014 | 1998 Nissan Frontier

1 Answer

Need a diagram of how to install a thermostat on my 99 mailbu


  1. do it when cold(coolant)
  2. if never done this before just follow thes step's
  3. on radiator at bottom it's left side at bottom (face the car)is drain plug loosen to let some of coolant out dont have to drain all of it (gallon or so)
  4. follow top hose to engine at end of hose will be thermosat housing it be 2 bolt's holding it on (1/2 inch socket )
  5. before taking out bolt's take clamp off of hose & pull hose off.
  6. now take bolt's out
  7. lift housing off
  8. look at how thermostat is in
  9. take out thermostat dicard
  10. clean gasket off of housing & engine block
  11. put sealer on block & put thermostat in (same way came out)
  12. put gasket on block & put thermostat housing on ,put bolt's in ,tigthen bolt's (20 flbs)
  13. put hose on & tigthen clamp
  14. close drain plug & titghen
  15. top off radiator with coolant
  16. crank engine , tpo off w/more coolant if need it ,let it run & come to temperture ,top off radiator again ,because when the thermostat open's coolant will begin to flow ,when full put cap on radiator ............DONE
  17. JUST CHECK MAKE SURE NO LEAK'S

Dec 17, 2010 | Chevrolet Malibu Cars & Trucks

3 Answers

Our 01 devill dts is overheating new radiaor,


That car holds 8 quarts of oil. Thats why its still low. You may have head gasket problems. Find a shop that is familiar with your Northstar engine, its going to be big bucks.

Mar 11, 2010 | 2001 Cadillac DeVille

2 Answers

Engine hot


First of all you need to check your coolant return bottle level, it's probably low, and needs coolant added. Heater will be starved for coolant, if level is low, thus, cool/cold air comes out. Try to add when engine is cool, to avoid getting sprayed with hot coolant. Leave cap off for a while, turn your heater on (not defrost) and let engine run up to temperature, and add more as needed while you watch level. Rev engine slightly and hold it for 5 seconds or so, every once in a while to help circulate coolant, and remove any air in system. If you have an actual rad cap, that you can remove and watch flow in radiator, that's even better, for adding and bleeding air out same way. Make sure your rad fan is working as well, and once you get it topped up, and heat back working, I'd seriously consider having a system pressure test done, as you obviously have a leak somewhere if the level went down to the point of overheating, and heater was starved for coolant. Keep an eye on that return bottle level until such time you have it checked, to avoid more damage to engine.

Dec 12, 2009 | 2002 Cadillac Sts

1 Answer

My BMW 318i has had a new expansion tank fitted after overheating and splitting.After bleeding the cooling system it seems as though the bottom hose is not getting hot any suggestions would be welcome


NORMALY THE HOT FLOW ENTERS THE TOP HOSE AND COOLER WATER LEAVE THE BOTTOM HOSE BACK TO THE BLOCK, SO IF THE TOP HOSE GETS WARM THEN THE RAD IS BLOCKED , IF NIETHER GETS WARM/HOT THEN THERMOSTAT NOT WORKING, OR YOU HAVE BLOCKAGE ELSE WHERE, SO REMOVE BOTH HOSES FLUSH RAD WITH HOSE PIPE, (WHEN ENGINE IS COLD) SEE IF WATER FLOWS OUT AT SAME SPEED AS U R FILLING IT, IF NOT ITS BLOCKED, 2ND REMOVE THERMOSTAT AND FLUSH ENGINE OUT, U CAN BUY RAD FLUSH/CLEANER AND TRY THAT,

Dec 05, 2009 | 2003 BMW 330

1 Answer

Need to locate where my 2001 cadillac deville thermostat Car is not overheating but is running hot not all the time I want to change my thermostat


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.

You will need to remove the air filter housing and air duct to gain easy access to the thermostat.

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.

The thermostat in the Northstar engine is a duel action device.
One end of the stem is the Thermostat(obviously) and at the other end is a spring loaded pressure valve(the thinner end).
Make sure the thermostat end is nearest the rubber hose and the pressure valve end is in towards the engine.

Don't forget the new gasket when you install your new stat, you may have to order this separately.


Overheating........

The most common overheating problem with the Northstar engine is a blocked purge line(small hose).The purge line is designed to purge air out of the cooling system.
There is a small diameter hose coming from near the top of the coolant tank (not the cap) ,this is the purge line.
With the engine idling,pull the purge line from the tank,if there is no coolant flow from this small hose,it is blocked and this will cause overheating.
If the hose is clear, check for blockage at the nipple on the tank.Or trace the hose back until you find the blockage.
The hose goes in to the engine to a crossover and comes out the other side close to the thermostat housing,the blockage may be there.

Also note that the cooling fans don't come on until the coolant temperature hits around 225 degrees.
During normal highway driving the fans will very rarely come on(if at all) due to constant air flow through the radiator.They will only usually come on in heavy traffic conditions on a hot day.
But......if you have the Air Con switched on, the fans will run all of the time.


Nov 05, 2009 | 2001 Cadillac DeVille

2 Answers

HOW DO I CHANGE THE THERMOSTAT ON A 1998 CHEVROLET LUMINA 3.1


FIRST OF ALL YOU HAVE TO DRAIN SOME COOLANT.JUST ENOUGH SO COOLANT WONT FLOW ALL OVER ENGINE.AND COOLANT TO EXPENSIVE ON THE GROUND.TO GET TO THERMOSTAT.YOU HAVE TO DISCONNECT CONNECTORS TO MAF EGR IDLE SPEED CONTROL AND IAT SENSOR.. REMOVE THROTTLE AND SHIFT CABLES FROM BRACKET.REMOVE AIR FILTER ASSEMBLY WITH MASS AIR FLOW SENSOR.REMOVE BOTTOM PORTION OF AIR FILTER HOUSING.REMOVE COOLANT HOSES FROM THROTTLE BODY.THEN REMOVE THROTTLE BODY ASSEMBLY.YOU HAVE TO DISCONNECT SMALL COOLANT HOSE TOP WATER PUMP.REMOVE SMALL BOLT THAT HOLDS METAL COOLANT LINE TO WATER PUMP.THIS LINE HAS TO BE MOVE JUST ENOUGH SO YOU CAN REMOVE THROTTLE BODY.ONCE THROTTLE BODY OUT THE WAY YOU CAN REMOVE THERMOSTAT.BESURE WHEN YOU PUT EVERYTHING BACK TOGETHER.REPLACE THROTTLE GASKET AND THE COOLANT HOSES COME OFF THROTTLE BODY BESURE TO USE OLD COOLANT HOSES MEASUREMENTS FOR NEW HOSES MEASUREMENTS MAKE SURE YOU BUY THE CURVE HOSE FOR THROTTLE BODY. DONT TRY TO USE STRAIGHT HOSE IT WILL KINK AND CAUSE NO COOLANT FLOW.WHEN YOU ARE DONE.FILL COOLANT BACK TO CORRECT LEVEL AND BLEED COOLANT SYSTEM.

Oct 25, 2009 | 1998 Chevrolet Lumina

4 Answers

1991 honda accord is overheating. Installed new radiator because of leak and the car started overheating because of cracked heater hose. Installed new hose and still overheating. Bottom radiator hose is...


When the car is completely cool,check the electric fan(s) for smooth rotation.

Clean/check/change the thermo sensor,contact and wire.

===

Excavate air pocket in coolant system / check for head gasket leak

This test will kill two birds with one stone.

===

MAKE SURE THE COOLANT SYSTEM and ENGINE IS COLD!

RAN THIS TEST IN A WELL VENTILATED AREA ONLY!

You will spill some coolant during this air pocket purge test.......BE KIND TO THE ENVIRONMENT and ANIMAL please clean up after the test!

===

Put the front end on a pair of ramp or park your car on a VERY STEEP HILL (radiator facing top of the hill) .

Top of the coolant reserve tank

Let it ran for 10-15 minutes.

Monitor for air pockets escaping from coolant reserve tank.

Small amount of bubbles is OK at 1-5 minute mark

After the thermostat open up (after 195 F warm up) at
5-12 minute mark or after high idle you should see less bubbles.

If you do not see any in rush of bubbles then your thermostat may be partially stuck or rusted badly inside the thermostat hosing.

Give the thermostat host few gentle taps.

If you see larger bubbles surfacing after 15 minutes then should do a hydrocarbon (HC) dye test to test for potential head gasket leak.

Let engine cold down and top off coolant reserve tank.

Start monitor for coolant lost

===

A coolant flush is require every 2 years or 24,000 miles.

I recommend the thermostat that has a relief pop-let to reduce the change of burst radiator and coolant hoses.

Make sure you get a new thermostat gasket,black RTV and fresh coolant for the job.

===
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Oct 17, 2009 | 1991 Honda Accord

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