Question about 1976 Cadillac Eldorado

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1978 Cadillac eldorado overheats after 15 minutes. I replaced have already replaced the radiator, themostat, and hoses. The fan is turning and the water pump is good, but i still can't figure why it is still overheating.

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Take a look at the hoses on the radiator sometimes they will collapse and stop the flow of water under high rpms

Posted on Aug 16, 2008

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1999 Cadillac Eldorado ,overheating changed thermostat , overflow cap ,no white smoke coming from exhaust.hot blowing from heater


Are the cooling fans coming on ? Go under the hood in the engine compartment , with the vehicle running have some one turn on the A/C , do you see and or hear the cooling fans come on ? Could be the coolant temperature gauge is bad ! How many miles on the vehicle ? Ever have water pump replaced ?

1

Check for a loss of system pressure.
Is there a loss of system pressure?
--
Go to Step 2 yes
Go to Step 3 no

2

Inspect and repair any faulty hose connections.
Does the engine still overheat?
--
Go to Step 3 yes
System OK

3

Check for low coolant protection (-37?°C/-34?°F).
Is there low coolant protection (-37?°C/-34?°F)?
--
Go to Step 4 yes
Go to Step 5 no

4

Test solution. Replace the coolant if necessary.
Does the engine still overheat?
--
Go to Step 5 yes
System OK

5

Check the water pump belt for low tension.
Is the water pump belt tension too low?
--
Go to Step 6 yes
Go to Step 7 no

6

Replace the water pump belt tensioner.
Does the engine still overheat?
--
Go to Step 7 yes
System OK

7

Check for an inoperative thermostat bypass.
Is the thermostat bypass inoperative?
--
Go to Step 8 yes
Go to Step 9 no

8

Replace the bypass.
Does the engine still overheat?
--
Go to Step 9 yes
System OK

9

Check the water pump.
Is the water pump inoperative?
--
Go to Step 10 yes
Go to Step 11 no

10

Replace the water pump.
Does the engine still overheat?
--
Go to Step 11 yes
System OK

11

Check the radiator fins for obstruction.
Are the radiator fins obstructed?
--
Go to Step 12 yes
Go to Step 13 no

12

Inspect and clean the radiator fans.
Does the engine still overheat?
--
Go to Step 13 yes
System OK

13

Check the cooling system passage for obstruction.
Is the cooling system passage blocked?
--
Go to Step 14 yes
Go to Step 15 no

14

Inspect and flush the system. Reroute or replace the hose if necessary.
Does the engine still overheat?
--
Go to Step 15 yes
System OK

15

Check the water pump belt for damage.
Is the water pump belt damaged?
--
Go to Step 16 yes
Go to Step 17 no

16

Replace the water pump belt.
Does the engine still overheat?
--
Go to step 17 yes
System OK

17

Check the cooling fans.
Are the cooling fans inoperative?
--
Go to Step 18 yes
Go to Step 19 no

18

  1. Inspect the electrical connector. Replace if necessary.
  2. Does the engine still overheat?
--
Go to Step 19 yes
System OK

19

Check the throttle body circuit flow.
Is the throttle body circuit flow restricted?
--
Go to Step 20
Go to Step 21

20

  1. Inspect the orifice and associated hose. Replace if necessary.
  2. Does the engine still overheat?
--
Go to Step 21
System OK

21

Check for a stuck thermostat.
Is the thermostat stuck in the closed position?
--
Go to Step 22
--

22

Replace the thermostat.
Does the engine still overheat?
--
--
System OK

Sep 16, 2015 | 1999 Cadillac Eldorado

2 Answers

Yesterday my 1988 cadillac eldorado's engine got very hot, even though it didn't overheat and all the fluids are fine including the antifreeze. I only drove around 10 miles. Do you know what might...


DOSE IT HAVE ELEC FAN MOTOR OR MECH FAN IF ELEC ITS THE SENSOR TO TURN TH FAN ON CAN BE JUMPED OUT INCASE OF EMERGENCY IFF MECH FAN NEED THERMOSTAT

Jul 28, 2011 | 1988 Cadillac Eldorado

1 Answer

1994 eldorado engine gets hot when idling but cools down while driving. When idling or driving slow it overheats and blows the coolant out of the overflow hose. when driving 45mph or more it cools down....


Sounds like the front of the radiator or A/C condenser is clogged up...take a water hose and try to clean any debre from the front, so air can pass freely...

Jul 01, 2011 | 1994 Cadillac Eldorado

1 Answer

I have 1997 Cadillac Eldorado ETC and it will overheat when I drive it for around 40 minutes. I can sit and let it run all day and it will not over heat but when I drive for a while it overheats. I have...


are your cooling fans working, do you smell exhaust if you let it rin with the rad cap off if you do its head gaskets if not do you have agood waterpump impellers sometimes go bad

Feb 09, 2011 | 1997 Cadillac Eldorado

1 Answer

Need to know where to put stop leak into my radiator


first off i dont advise using this type product, but i know it isnt always convenient to buy a 2 r 3 hundred dollar radiator, but anyway, with the car cool remove the radiator cap and let the car run about 4 or 5 minutes and pour it directly in the radiator and replace the cap, you will then need to drive the car an additional 15 or 20 minutes for it to take effect, i would replace the radiator asap, asit could cause it to overheat and cost tons of time and money,GOOD LUCK!

Jan 08, 2011 | 1998 Cadillac Eldorado

1 Answer

Engine overheats but is not leaking from radiator. After the SUV has run for 10-15 minutes at 1500rpms or less it overheats and begins to vent steam. When running at 2000rpms it only takes 2-3 minutes to...


check ur themostat take it out boil some water in a pot drop ur thermostat in the pot watch to see if it opens take it out watch it close if working properly,make sure ur pump is moving water take off ur radiator cap to insure water is moving,then check to insure ur cap is getting a good tight seal u only have ur cap,pump,hoses,radiator,thermostat,unless of course youve overheated recently???then u could have other issues

Oct 21, 2009 | 2000 Dodge Durango

1 Answer

My 1999 eldorado overheats, nothing is leaking, coolant has not been changed until now, could sludge be cloging thermastat, should i change it? I changed radiator cap, Could air pockets cause overheating?


If you aren't loosing any antifreeze, you might check to see if the coolant fan on the radiator is coming on. If the thermastat is sticking your radiator hose will be solid to even swellen sometimes. Of course not to mention that if a radiator is over 5 years old, it could be bad, so you may need some things checked futher.

Oct 19, 2009 | 1999 Cadillac Eldorado

1 Answer

Overheating


Is the fan now working? Your engine will continue to overheat if you have not fixed the fan. Check the fuse for the fan, connectors, and replace the fan if necessary.

Sep 28, 2009 | 1995 Cadillac Eldorado

1 Answer

I am having trouble trying to locate the thermostat on my cadillac it needs to be replaced cause its making our car overheat.


follow the top radiator hose to the intake and your themostat is under there. what year is the car

Jun 25, 2009 | Cadillac DeVille Cars & Trucks

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