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Cadillac Radiator Questions

Does a Cadillac Radiator have a leak? Need to know how to replace a Cadillac Radiator or what type of coolant to use?

The Cadillac radiator is designed to perform one of the most crucial tasks, and that is to cool the engine. Its ability to perform this task affects the life of the engine as overheating can cause many maintenance problems. It is important to check the radiator from time to time and make sure that it is always filled with water or coolant.

Being unaware of the problems that could arise from time to time with Cadillac radiators could cause questions. Read below for some frequently asked questions that have been answered by Experts.

Could radiator coolant used in a Cadillac radiator without mixing water damage the radiator?

Most of the brands of coolants now come premixed as a 50-50 mixture of water and coolant which is clearly stated on the container. If pure coolant is used, it won’t damage the radiator, but will cause it to freeze quicker and boil over quicker.

In a Cadillac radiator, if radiator ‘stop leak’ is put in the engine oil, how can one get it out?

This could be done by running some engine cleaner through the oil system for about 5-10 minutes. Then the oil could be drained, the filter changed again, and fresh oil added. There are different brands of engine cleaner sold in several auto-parts stores.

Could Bar’s leak fix the Cadillac radiator, or does the radiator need to be replaced?

It may not be a good idea to use Bar’s leak as it can clog the radiator core and reduce the coolant flow thereby causing an overheat condition. It would be a better idea to replace the radiator.

How to flush the Cadillac radiator in a 97 STS Northstar?

Use either a flushing machine, or both the radiator hoses can be removed and with a garden hose, water could be pushed in through the bottom of the radiator for about 5 minutes. Then let it drain, and put the lower hose back on. Then add the coolant through the top hose spot, and finally replace the top hose.

In a Cadillac radiator, how can one check if the PCM has failed?

A scan tool will need to be connected in order to monitor the sensors through the PCM.

What could cause the engine to overheat on a Northstar even after replacing the Cadillac radiator?

First, check to see if the water pump belt is still on and hasn't broken off. This belt is located on the driver’s side of the vehicle and is different from the main serpentine belt. Next, replace the thermostat as it is common for them to stick and cause the engine to overheat. Once the engine overheats, then the head gaskets could begin leaking and they will need replaced quickly or major engine problems will occur. Using a block tester from an auto shop, test the head gaskets to see if they are leaking. The block tester sits on top of the reservoir with the reservoir cap off. The tester will be filled with a blue fluid in its clear container. While the vehicle is running, if the fluid starts to bubble and blue turns to green, it is an indication that the head gaskets are leaking. In this case, it may be best to get both the head gaskets repaired.

The Cadillac radiator, having been designed to cool the engine, if not maintained well could decrease the life span and performance of the engine. Being unaware of the problems that could arise and how to handle them could lead to questions. When questions arise, turning to an Expert for answers could prove to be beneficial.
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