Question about 1999 Cadillac DeVille
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Posted on Jan 02, 2017
SOURCE: car leaking coolant
First of all ensure that your car is leaking coolant fluid, and what is dripping is not just water condensation from the air conditioner.
If you have a coolant liquid leak, it can be from one of the ducts leading to radiator , from water pump or radiator itself. Check liquid levels, and if you have a leak have the car inspected by a qualified mechanic.
A broken water pump, for example, can cause your motor to blow in few miles.
Posted on Jun 08, 2008
SOURCE: Coolant is disapearing but can
If you happen to have the Northstar 4.6 L engine, prepare to spend big bucks. These engines have a problem with head gaskets and do exactly what you describe when they go bad.
Best solution is a good used engine. Even the Cadillac dealerships don't like to repair these engines.
Posted on Jul 26, 2008
Question that I pose is:
Is the car overheating or are you assuming it is as the gauge is telling you that it is?
There are two cheap and simple things that are not mentioned in this post. There is an Engine coolant temp sensor which in all of their innane wisdom Saturn built with a plastic tip and we all know plastic melts fairly easily. This part is a simple fix as it needs a 13mm deep socket and that is it for tools to replace it and it is $10 - $15 for a new on with a copper tip. There is also an Engine coolant temp switch which sends information to the PCM to tell the gauge what the reading should be. Aslo $10 - $15 and a 13MM deep socket to replace. These are common issues with the S Series Saturns. I do however recomend that if you are going to replace them yourself that you empty the radiator of coolant as the sensor and switch are directly in the engine block coolant flow and will give you a nice little shower if you do not at least jack the drivers side up before replacing them.
Posted on Dec 02, 2008
You have obviously changed all your cooling system components, so we should be able to rule those out.
Now we need to think outside the box.
1) When the car over heats, has anyone checked the coolant temperature with a manual temperature gauge to verify it is truly running over-temp, is the cooling system loosing coolant when it over heats or steams?
2) What is the glycol mixture used. If the mixture is more than a 50,50 mix of ethylene glycol, too much glycol can cause the engine to overheat.
3) Make sure the lower radiator hose has a spring in it to keep it from collapsing.
By the way, what engine do you have.
Posted on Mar 27, 2009
Check for coolant flow at the Purge line,this is a common problem on the Northstar.
There is a small diameter hose coming from near the top of the coolant tank,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.
Posted on Aug 22, 2009
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