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89 iroc-z coolant fan wont turn. replaced fan motor,fan switch,temp switch and relay still no fan

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SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

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Posted on Jan 02, 2017


SOURCE: finding the relay for electric fan on '89 jeep cherokee laredo 4.0

thank you

Posted on Sep 06, 2008

  • 702 Answers

SOURCE: Cooling fan wont work

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.

Posted on Sep 27, 2008

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SOURCE: 94 buick roadmaster over heating changed waterpump

I feel there is a sort somewhere in the fan circuitry, check its fuse unit. Also ensure proper level of engine oil is present in the engine. Actually your car might be overheating because the respective fans are not powering on at the correct time, but you mentioned that these fans are in working condition so it has to on something in this circuit that is preventing completion of this circuit by their respective sensors which you have recently changed...............sodeep

Posted on May 04, 2009

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SOURCE: Chevy cavalier temp guage stopped working on instrument panel

if the wiring is good and there are no blown fuses, likely the gauge itself will have to be replaced

Posted on May 30, 2009

  • 3 Answers

SOURCE: 1988 Chevy Camaro Iroc Z

The engine fan switch is located in the right side cylinder head between the spark plugs. There are two different sizes that you might find installed, 5/16 or 9/16 inch threads.

Posted on Sep 02, 2009

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Cool fan won't run on its own I put a relay to the cooling fan motor so it runs key on ,all is well ,temp stays normal ! I pulled the relays / fuse tested them with a meter , replaced the temp send...

Need to know some specifics for a specifis answer.
To answer in general, Sounds as if you replaced the correct computer temp sensor (it would have a voltage reference signal) and not the gauge sender. The temp may need to reach 235 degrees or so to kick the fan on. Too me that is way too high. But running at a higher temp normally lowers emissions and I think that is the reason for the high temp to kick on a fan.

With a scanner you can see what the temp sensor is reading and when there is a fan request from the computer. Not everyone keeps a scanner for home use.
Do you have A/C and does the fan ever kick on when the A/C is on?

You can try this,
Go to your factory fan relay and figure which is the ground signal wire (the ECM sends a ground signal to trigger the relay. Early wire such as in my 89 IROC is a green with white stripe). Ground this wire with the key on. Does the fan come on?

If the fan comes on, look at the cylinder heads between the exhaust ports. The right side may have a pipe plug towards the rear. Left side it would be up front.
If there is a pipe plug then there is a provision to add a low temp fan switch. Search (or another source) for a low temp fan switch. Hypertech makes some. Install that into the port where the pipe plug is (careful of thread sealant as it can interfere with a good ground it needs). Connect the wire from the low temp switch to the ground wire of the relay. You can use a center tap as all you're doing is adding a ground (thats not like something that will draw current which you don't want to do).
This way you have a low temp switch to send a ground signal to the relay and still have the factory computer circuit.

You can get free wire diagrams from in the repair section. This way you can look up your specifuc vehicle and see what wires do what and which would be the ground from the ECM.

Sep 22, 2011 | Chevrolet Venture Cars & Trucks

1 Answer

What Switch or control makes the radiater fan come on? and need the diagram for the radiator control switch, 1993 saturn sl2.

Ok. The way your system is set up,you have a fan switch located in the engine block,usually near the top.That fan swtich sends the voltage to the fan motor or to a fan relay then to the motor.You can jump the fan motor directly to make sure the motor itself is not burned out by unplugging the motor and running a jumper wire from your battery pos terminal to the terminals on the fan motor itself..If you have checked the motor and it does work,then the easiest thing to do is simply replace the fan switch.You should have a Coolant temp switch and a radiator fan switch and possibly and Radiator fan relay.I would try the radiator switch first,then replace the relay.The coolant temp sensor is for the computer and usually doesnt tie into the radiator fan switch.try that and repost.Good luck

Aug 23, 2011 | 1993 Saturn SL2

1 Answer

How do i take my radiator fan off of my 87 iroc-z

Replace the fan relay in the fuse box in the engine bay first. Fan motors very,very rarely go bad. Check the relay first, you may save yourself an a lot of time and money. It may also be a bad coolant temperature sensor or a bad connection and/or bad ground.

Aug 01, 2010 | 1987 Chevrolet Camaro

2 Answers

Coolant fan will not come on, Fan motor OK

Check the switch that triggers the fan, when the car is hot the switch should be closed (passing current). This would be my #1 suspect.

Apr 30, 2010 | 2002 Jeep Grand Cherokee

3 Answers

1992 Dodge stealth cooling fans wont work

Unplug you're fans.. Take some wires, ( i used speaker wire2.gif. ) Have someone help you, :) connect it to you're fan and then to the battery one to ground one to power. If you're fan doesn't turn on then you're motor in the fan is dead.

2nd.Check you're relays, Easy way to do this is switch them around one byone... They can't all be bad :P and if it turns on.. then you have abad relay:P

3rd. Does you're Temp gauge work? There are a few sensors That could need to be replaced.

Sep 05, 2009 | 1992 Dodge Stealth

4 Answers

89 jeep cherokee overheating

Ok, fans work but you should replace temp. sensor so they come on automatic. If the temp gauge inside the car is getting really hot its either because the termostat is stuck closed or your water pump is pumping water to circulate it through the radiator and engine

Aug 29, 2009 | 1989 Jeep Cherokee

3 Answers

Coolig fans dont run

the cooling fans are run by a relay it's located in the junction box. check this. there is also a thermoatic sensor located near the fans next to radiator. the fans should free spin when the engine is off this is a good indiacator that it's not the fan themselves. if the relay checks out(run engine and switch the fan relay with the a/c clutch relay when the engine reaches 180 degrees you will feel the upper radiator hose get hot the fans will turn on a short time later iof they don't it's the temp sensor near the radiator if they do it's a bad relay...please rate this thanks

Sep 28, 2008 | 1994 Pontiac Grand Prix

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