Cadillac Repair: 1989 CADILLAC 4.5 NORMAL RUNNING TEMP, last driven with programmed key, auto theft claim SIU investigation EUO Denial expert

Question
NO ONE I ASK CAN TELL ME WHAT THE NORMAL RUNNING TEMP IS FOR A 1989 CADILLAC EL DORADO 4.5

Answer
Hello,

That is because there is no such thing as normal. There are many variables. Ambient temperature, the mixture of coolant (anti freeze) at idle, engine running at different rpms, the condition of the cooling system components, the engine history, the accuracy of the temperature gauge etc.

However, since I am so very well versed in these aluminum engines, I can give you a warning of where the temperature should not be. If the engine is running above 225 degrees, it needs to be shut down because the engine components are literally melting on you and catastrophic destruction is imminent.

When these engines over heat, the first thing to go is head gaskets. Many think that the head gasket issue was the reason for over heating. This simply is not true. It is the result, not the cause. If trying to replace the engine with a used junk yard engine, it is in vane because most of those engines suffered from over heating.

Boiling for water is 212 degrees f. Adding coolant increases the boiling point to 220-225 degrees f.
A cast iron engine can take over heating much better than an aluminum engine. Cadillac started using the aluminum engines in 1982. They were more powerful and less weight. They should have had a warning for the consumer though that these engines cannot be overheated even a little bit and the minute the hot light illuminated, it was generally too late. GM in my opinion did not include this warning, because they made billions selling crate engines and parts.

Even the AMC/Renault Alliance and Encore made their engines so they were repairable. Internal damage to engine-no problem, because a piston and line kit was available. In the case of a Cadillac, in many cases once overheated, the engine was junk or at minimum would cost $1,500.00 for the head gaskets to be replaced and the over heating issue had not been addressed.

To give you an idea as to the circulation issues to these issues and the small cooling jackets, it has been common to see where a water pump was replaced and some of the old gasket material was left inside the engine. This instance was enough to cause over heating.

I hope I have given you ample warning to your question as to the temperature range that you don't want to be at.

If you ever have a camp fire, toss an aluminum can it it. Then picture in your mind that this is happening to your Cadillac aluminum engine from over heating. This really gets the point across.

Good Luck!

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