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I have a 1995 cadillac seville v8 and we just changed the waterpump the thermostat the radiator the fans and even the resivoir but its still overheating. occasionally when i crank it up lots of white smike will come from the exhaust. what coulds be causing this?
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Wrong thermostat ? You need a 195
Did you replace the coolant sensor ? This runs the fans
Run the engine, wait until the engine heats up, if the fans do not turn on when the temp reaches 195, you have a blown coolant sensor, defective relay, or bad thermostat
Check the waterpump and thermostat. When the waterpump doesn't turn, engine heat is not transported to the radiator. When the thermostat doesn't open once warm the same happens - no engine cooling.
The radiator should be hot op top and cooler at the bottom. If it's cold allover then there's no cooling fluid transport
Check your water level. If coolant is fine, then you might have to change your thermostat. Also your waterpump might be getting weak. When a water pump goes bad, there are bore holes that will leak, have you noticed any coolant on the ground or under the hood? If so where? Sometimes the thermostat starts sticking as the vehicle gets older, or a higher temp thermostat is installed. If this happens, like low coolant, the car has to run to a certain temp before the fan comes on to cool it. If you check all that and it still does the same thing, flush your cooling system. If you check all of this and still have a problem, let me know and I will help you fix it. Hope this helps
Did you burp the cooling system after changing those parts? If not, you have to. Jack up the car so that the thermostat is pointing upward, and start the car. Let it run until it's 3/4 of the way to overheating. Then shut it off and let it cool. When it's cooled down and safe to open the radiator cap, do so - this will burp the trapped air bubbles out of the system. The coolant level will go down, now that the bubbles are gone, so top off the coolant. You may want to do it a second time to be sure, and then you should be set. If not, you have more serious issues (potentially bad head gaskets, for example).
Ensure motor tune or other motor mechanical condition is not the cause of overheating,
I assume the motor is actually running hot, - ensure the high gauge reading is not just a gauge sender problem.
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 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.
If none of the above fix your problem, replace the thermostat again - it is not unheard of for a new thermostat to be faulty .
It is possible that there was a problem which initiated the warning but is no longer present. There are several things that could cause this. Even a vary hot day with a lot of stop and go driving could be enough to give you that warning. It could also be that something is starting to fail, like a thermostat or temperature sensor. It it really difficult to say without seeing the vehicle. However I can tell you that 250 degrees is on the high side. The radiator fan should turn on around 225 and off at around 215. You can check your fan be lifting the hood and starting the car. When you see the fan turn on check the temp. Then give it a few minutes. The fan should turn back off. If it just runs nonstop that's a good indication it's running too hot. Have you checked your coolant level? You should make sure it's full and if not check for any leaks under the car. Also make sure there are no obstructions to the air flow on the radiator grill such as leaves. If your coolant level is fine and you can't see any thing that would affect the air flow then it would be a good idea to have it checked out. At the very least have the codes read. Places like Auto Zone will check the error codes for free. Also you should check for recalls on the coolantadiator system.I included a link where you can check through. Hope this helps.
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