This is actually not too difficult.
I recommend replacing the upper, and lower radiator hoses while you are replacing the radiator if they are getting old.
1. Disconnect the battery.
2. Remove radiator fan (Some had two 10mm bolts at the top, and slots at the bottom, others had two more 10mm bolts on the bottom.) - And unplug the electrical connector.
3. Disconnect transmission lines (you will loose a bit of fluid)
You may also have two engine oil cooler lines that need removing (Also may loose some oil)
4. Remove upper and lower radiator hoses, and the overflow jug hose.
5. Unbolt radiator (should have two 8 or 10mm bolts connecting it to the radiator support near the top of the radiator)
6. Pull radiator up and out.
7. Reverse for reassembly
8. Refill radiator, I usually leave the top radiator hose loose while filling to remove air bubbles in the engine. - reconnect upper hose when fluid starts to get close to the radiator inlet. Some of these engines have a small brass air bleeder near the thermostat housing to accomplish this in a different way. Also fill the overflow jug about half way.
9. Check transmission, and engine oil. - Run engine, and watch for any leaks. - Recheck antifreeze just to be sure. Obviously don't open the radiator cap when the engine is hot.
SOURCE: 1996 Buick regal over heating
Hi,
Check the sensor and wiring from it for a short.
Hope this is an easy fix for you.
SOURCE: replace rear struts 1996 buick regal
Here is a link describing your strut replacement. Autozone also has free tool rental for the strut spring compressor if you need it. Thank you, and don't forget to vote. http://www.autozone.com/shopping/repairGuide.htm?pageId=0900c152800681ba
SOURCE: Low Coolant light flashing on 1996 Buick Regal 3.8
The low coolant sensor should be located in the passenger side radiator tank, You need to take it out and clean the sludge off of it for it to work right. Or you can just unplug it and forget about it, the light will go out and it won't cause any problems.
SOURCE: 1996 buick regal knocking noise
The intake may be leaking coolant into the crankcase. This can cause the lifter to bleed down also.
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