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Need to replace the radiator well on a '95 Buick Skylark. Is that possible to do all by itself, or do I need to just need to replace the whole radiator assembly?
To make repair a new or good used one will be in your best interest. most well repairs,< if they are able to solder have to be done by experienced people>. Not what everyone wants to hear, but I have done a lot of trial and error and error wins most of time when experience is key.
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You have a couple of different problems here. You need to address the leak issue first. If you took it to a shop, go back and tell them to fix their work. Your radiator fan is another issue. Is this fan the big one you normally see on engines or are you talking about the auxiliary cooling fan that is mounted in its own assembly right behind the radiator? The auxiliary fan is controlled by a temperature sensor that your car's computer operates. For a better explanation, see the following link:
More than likely, the shop that did your work did something wrong and they are required to fix their screw up. At a minimum, they should warranty their work for at least 90 days.
Your heater coil is most often located in your vehicle's firewall. To find it, locate your water pump on your engine block and follow the water hoses back to the firewall. Where these hoses end you will find your heater core. To answer your question, no, your heater coil will not cause your radiator to leak. They are two separate units.
first verify if the fluid is low or not, in the coolant tank and the radiator. if its low, refill it with water and have it pressure tested asap. if the radiator is not low, the sensor in the radiator is bad and will need replacement.
You need to check the radiator cap for air leaks and also try having the radiator Flushed as you could have plugged fins inside the radiator, causing the radiator not to cool the antifreeze.
Your first question sounds like a coolant flow problem.
Make sure that the cooling fans are running when the car is hot
Check radiator temps in several places( an infared thermometer can be used for this). Radiator temp should not vary more that about 15 degrees from inlet to outlet side of the radiator. If there is a lot of temperature variance a coolant flush might help, but you probably have partially restricted raditor.
Check for coolant flow. While doing the flush remove the radiator inlet hose and start the car. MAKE SURE THE COOLANT TEMP IS NOT HOT. If there is lots of flow the water pump is pumping.
Check operation of the thermostat. It is a good idea to replace the thermostat whenever doing cooling system repairs.
For your second question you also seem to be going in the right direction. The fuel pump has a check valve in it that can fail and cuase lack of fuel pressure on start up.
If you do have a fuel leak it will cause the same concern. Make sure that there are no fuel leaks.
Another possibility for this concern could be low battery voltage due to a weak battery, or corroded battery terminals or cables.
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