90 RS Conv. w/ 305 TBI (?, carbeurator looking injection). Obviously a noob here, but the fans that are just behind the radiator do not activate. The car got to 220 degrees and the fans never came on. It seems like the temp guage never used to gett close to the '1/2' mark, but it did the other day and the fans did not come on. Seems like they should though. When do the fans activate normally? What can I do to check they're functioning properly. Thanks in advance. Great site by the way!

 

Run power to he fans directly and see if they work at all. If they work then we can go further. There is a sensor on the pass side of the head that when grounded should activate a fan. The other is controlled by the ECM. Just because the gage says it is 220 doesn't mean that the ECM sees the same thing or that the fan relay is active.

 

Thanks for the reply. I've been a couple different places looking for a description of the procedure you recommended. Care to hold my hand on how to apply power to the fans. I'm assuming you make some sort of connection to the battery? Thanks again.

 

On a 305 TBI, the ECM has no control of your fan. It is controlled by the thermal fan switch located on the passenger side head and a mechanical switch on the A/C-Heater slide ****.

Start diagnosing performing simple tests first. That would be to turn the A/C on with the engine running. The fan should run. If it does not, either the fan motor is burned out or the fan relay is not functioning properly. It is highly unlikely that the slide **** is at fault.

To test the fan motor, disconnect the two-wire connector from it and jumper the connections with either a test light or voltmeter. If there is voltage, the fan motor is bad. If there is not, the most likely cause is a bad relay. To further test the system, disconnect the one-wire connector at the thermal switch. With the ignition in the On position (engine does not have to be running), ground this wire. The fan should turn on.

Also, go to thirdgen.org and do some reading on the Cooling It Down board. It is dedicated to third gen cooling systems.

 

Post pics of car.

You do know that if that car is ORG. That there was only 723 of them made.

 

Post pics of car.

This website does not allow picture posting.... stupid in my opinion. But you can go to the History board at thirdgen.org and post it there!!

....That there was only 723 of them made.

729 is the correct number. Reference: Camaro White Book

Now, lets get back to the topic at hand....

Willie

 

Willie, thanks for the info, much appreciated. I've been having trouble with the AC. I've come to the premature conclusion that it's lacking some refrigerant as the clutch is slipping and AC is not cooling. I WAS over at do it yourself. com, but had issues with a rude moderator. So, like I said, some probs w/ the AC, and I haven't ran it in almost 2 months. Since I can't seem to get my hand on a set of manifold guages, guess I'm going to have to take her in to get the AC checked out. Will have them look at the fan too.

Krazycowgirl, it's ORG as far as I know, with the exception of conversion to r-134-a refrigerant. Will be needing a new top within the next couple of years as well as new paint. It's one of the best documented cars I've come across. I bought it used about 2 years ago with 110,000miles from the second owner who purchased it from a person in California. It came with a notebook full of every bit of maintenance etc, as well as the window sticker from the original purchase. I know I have a gem, but if what you say is true, it could be slightly more valuable than I originally suspected. What would a pic prove in regards to its' originality? Will definitely get a pic posted as soon as I shine her up a bit, she's a daily driver.

Thanks alot for the input, I appreciate it.

Sam

 

[B]Willie, thanks for the info, much appreciated. I've been having trouble with the AC. I've come to the premature conclusion that it's lacking some refrigerant as the clutch is slipping and AC is not cooling.

You're welcome. But because on a TBI car, the fan switch is mechanical -- turns on when the slide lever is put in any of the A/C positions, lack of system pressure (or anything related to this) can be ruled out as a cause for a non-operating fan.

Also, when the ECM is put in diagnostic mode, the fan should run. This is another simple way of testing it.


I WAS over at do it yourself. com, but had issues with a rude moderator.

I want to confirm we're talking about the same board. Was it:

http://www.thirdgen.org/techbb2/foru...?s=&forumid=49

If it was, I can do something about this. Let me know if the moderator was "breathment" or someone else.

Willie

 

I had this problem, I ran a direct connection with a wire and it worked, so i figured it was the relay, i went and bought it and now it werks. Relay was about $15 if not less

 

Kurupt>> Thanks, will def. keep that in mind.

Willie>> no it was over at http://www.doityourself.com
"lack of system pressure (or anything related to this) can be ruled out as a cause for a non-operating fan."
<?>, are you telling me that because the AC is low on refrigerant and therefore lacking system pressure, this can be ruled out as a cause for non operating fan? I'm sorry I'm just not following.

Peace