I have an 89' Camaro RS Coupe with a 305 TBI VIN E. I have owned the car for about 6 years now and have recently been trying to get the components back to the way they should be. The car had a 3rd party cooling fan hook-up relay and temp gauge. I replaced the temp sendor and it got the gauge to work. Now for the fan relay. I got a new relay and hooked it up the way it should be and hooked the correct wires up to the fan. Ran the motor up to the point before it got to the red on the gauge. The fan never came on. The fan would come on if i turned the A/C on. But thats it. So now i am thinking its the fan temp switch. So i replaced it (Which was a major pain in the *$$). Made a coolant mess. Ran the engine again back up to temp( about 245degrees) I know it is supposed to come on at about 220 degrees. Anyways it wont come on and i am running out of stuff to do to get it to work.

I have read on the forums how the ECM tells the fan when to come on. But i have just put a brand new ECM in the car(A whole other story of how i found out it was bad) and i have read in ALLDATA that the computer doesnt control it in the 305 tbi motors like i got. It supposed to control it in the V6's as far as i can see. The ECM isnt in a single diagram in the wiring circuit with the fan motor.

I need help. If anyone has anything they can help me with, please do so. One thing that can help is the wire going from the fan temp switch is supposed to tie into the wire coming from the A/C switch. Does anyone know where that connects at?

I forgot to mention. It has only 1 single fan.

 

TBI cars, the fan switch and A/C makes the fan run. 238°F is the fan switch turn on temp. Sounds like eveything is wired correct. ECM switched fans turn on at 220°F

Key on and grounding the fan switch wire will tell you if the circuit is working or not.

 

Thanks. I will try that first thing in the morning Anybody have anything else it could be just in case that don't tell me anything? I will be checking these post all through the night so i can get a list of things to try in the morning. Anybody need any other information from me about anything? I will answer them to the best of my knowledge.

 

Fan switch was installed in the passenger side head? Has a connector similar to the Knock Sensor? It would be fairly easy to get the wrong part, maybe a guage sender, put in by mistake.

The temp switch should have a single wire lead and will ground the lead to the engine when the setpoint is reached. After you've verified that the fan will run when the lead to the switch is grounded, either: the switch is bad (unlikely), wrong part, it's not reaching it's setpoint (how are you determining that the motor's getting to 240? the dash guage is notoriously inaccurate) or it's not getting continuity to ground. Using teflon tape to install may prevent continuity to the head.

 

Yes, the switch was on the Pass side head,

http://www.autozone.com/autozone/catalog/parts/partsShelf.jsp?categoryDisplayName=Climate+Control&fromType=parts&fromString=search&parentId=cat30062&currentPage=1&filterByKeyWord=fan+switch&isSearchByPartNumber=false&navValue=15200115&categoryNValue=15299999&fromWhere=&itemId=prod61259&displayName=Cooling+Fan+Switch+-+Radiator&searchText=fan+switch


Yes i was reading the gauge. Is there any other way to tell if the gauge is accurate? Teflon tape was used on both the temp sender and the fan switch.

 

Well i grounded the fan switch wire to see if the circuit was good and the fan came on. So i ran the engine so the gauge would read high. Guess what, when the temp gauge read about 250-255 degrees, the fan came on. So i'm guessing that the gauge isnt reading accurate. So i am going to have to replace my gauge in the near future. Thats prolly why they had a 3rd party temp gauge ran in the car. Thanks for your all your help.

 

Any body help I swap a 94 vette lt1 into a 86 Irocz will I have to change to daul fans ??I havent started the car yet and did some 3rd Gens come with daul fans maybe I could fine some used one are will the single electric from the 86 IROC Z do the job ???

 

Yes they did. I believe the TPIs came with them. I'm not sure exactly which ones did but i know some came with them.

 

Why is the fan switch set to come on at 238 degrees? Thats seems very high to me..

 

thamks for your help I guess that single fan I got could have come from a 2.8 that one my girls wreck years ago

 

Could have been a 305 TBI also. Thats what mine is and i only have a single fan.

 

if I fine the daul fan would also need the fan relays

 

I not exactly sure. With the duel fans i believe one is contoled by the ECM when it gets up to about 220 degrees. The other fan is controled by the A/C when you turn it on. I dont know if both fans would need a seperate relay or not.

 

Yes. You don't have to have to OEM wiring but, each fan needs its own relay.