1998 corvette water temp get up to 225 to 230 befor fan come on. where are the cooling fan control sencors located, not the relays

Step 1:

This cooling fan circuit has 2 cooling fans and 2 cooling fan relays, both cooling fan relays are located in the BJB (battery junction box, underhood fuse box) there is a low speed or main cooling fan relay in cavity location # K-46 and the high speed relay is location # K-47! Also check the main cooling fan power fuse # 2 in the same BJB, The fuse is a MAXI-FUSE (large one) it is blue in color and is rated at 60amps!

Step 2:

Also check the coolent tempature sensor thats what signals the fan to turn on.

Step 3:

Do the fans turn on when you turn the a/c on. if not may have bad fan motor

cooling fan has a heat sensor that controls it and is located on the engine...correct place on that car i do not know but local auto parts store should be able to help you out as to location....hope this helps

the usual culprit is a bad relay. Some cars have 2 or 3 cooling fsan relays, usually under the hood in a fuse/relay box. Look in owner manual for fuse/relay locations and pull the cooling fan relays one at a time & see if it cuts off. That could be the bad one. The engine computer usually controls the fan motor based on input from the coolabnt temp sensor or by when you have the heater controls set on a/c or defrost modes.

mcdevito75 here, At the relays wiggle the wires to see for loose connection, also see if you can jump the fan direct to the battery to see if the fan works., Also the fan relay could be bad, or the temp. Between the relays and fan there is a temp sensor that puts the fan on, jump that and see if the fan works.

Cooling fans ( on radiator ) only come on when the engine reaches a certain (hot) temprature. There is a temp sensor threaded into the radiator end reservoir that switches a relay off and on that runs the fans. Either the temp sensor or the relay is probably bad. Normally , those fans will not be on if the car is moving , the air flow from just driving is sufficient to cool the rad. If you stopped and idled for a while , eventually the rad would heat up enough for the fans to come on.

The cooling fan relays are located on the upper radiator support in front of the left front wheelhouse.

you have 2 relays for your fan, primary and secondary
their controled by the PCM according to the temperature

Your Problem Can VERY WELL BE with the Temp Sensor, As It Is the First in This Electrucal Circut . it Waits for 210-230 Degree Engine temp and Gives that Sygnal to the ECM then ECM Grounds out the Cooling FAN RELAY To Turn ON the FANS and the Temp Sensor is Usualy THE #1 Culpret Closley in front of the RELAY.
There are 2 Sensors On this Vehicle The One You Replaced and One Located At Trans Side of
Engine Closer to Front of Vehicle At the Head ,Thereis a 2 wire Plug On it and This Sensor Goes to the ECT witch CONTROLS COOLING FAN RELAY. Hope this Helps and if you Need A Diagram For this It Must be Emailed as FixYa Does NOT Support Large Picture Files. My Email Add. Is MY
Screen Name Here on FixYa @aol.com

Cooling fan relay would be a good starting place.

The water temp sensor is located near the thermostat housing. This sensor is what tells the ECM to turn the fan on/off. The water temp sending unit is located near the same area. You know you have the correct sensor is because the water temp sensor has a 2 prong plug. The water temp sending unit only has 1 prong.

Fan usually comes on within 200 degrees. Could be less. Usually the relay switch is under the engine from the front. get under the car and look for a silver switch right by where the electrical wires hook up with the fan.