I installed a new radiator and thermostat in my '95 Buick Riviera and now the cooling fans are not coming on when the car warms up.What's the reason?

Do the radiator cooling fans work ? With the car idling turn on the A/C , does the radiator cooling fan come on ?

i dont know how accurate your gauge is, but a lot of gm cars that i have scanned to check fan operation didnt kick the fan on till about 220 degrees. it seems yours is probly working fine. the thermostat isnt fully open till about 200 degrees if its a 195

The engine cooling fan is located on the front of the engine between the radiator and the engine block. You do not feel it through the ac vents.

on that motor they are prone to blowen head gaskets you need to do pressure check of the cooling system

I presume the problem is overheating? Be sure you are using a new 195% degree thermostat...these motors are usually not a problem of running hot...the best thermostat is the new "fail safe" design. This thermostat is designed to freeze open if fails...never closed to cause overheating...a few more bucks but worth it. This is a huge cooling system on your Buick...could be early signs of failing water pump, or restricted radiator flow...sometimes just needs a new radiator cap. Hope this helps.

Generally the thermostat housing is what the upper radiator hose connects to. It can be held in place by 2-4 bolts. When you unbolt it, the thermostat is right underneath and puls right out. Take note of the orientation of the old thermostat and ensure that you put the new one in the same way. To remove the radiator first remove the upper and lower hoses, then remove the transmission cooling lines. You will need to remove the fan shroud and the upper crossmember that secures the radiator at the top. When that's done, simply lift the radiator oout. Reassemble in reverse order. When you refill the cooling system, use ditilled water rather than tap water.

The cooling fans are controled by the CTS... coolant temperature sensor, on your vehicle

Hello smack609: My name is Roger and I will help you. To locate the thermostat follow the upper hose from the radiator back to the engine. The upper hose connects to the thermostat housing. Drain the radiator and remove the two bolts at the housing. Remove the housing to locate the thermostat. Reverse the procedure to reinstall. NOTE: The coolant system will need to be purged of air. Filling and starting the engine is not sufficient to fill the cooling system. Locate the bleed ports and open them. One is located on the thermostat housing. With the bleed valve open fill till you see coolant and no air bubbles. Start the engine and warm up. Watch the temperature to make sure it does not over heat. You may need to purge the system more then once. Do not assume the system is full until the coolant fan cycles at least twice. Should you need further help please just ask. Please rate the answer. This way I know it was helpful. Thank You for using Fix Ya. Roger

BOTH!... when you find out WHY the fan is not operating, let us know... OK?

I would have the radiator roded out by a radiator shop, this of course requires removal of the radiator to complete the rod out.