Jmj93z28

I have a 93z28 an the car don't over heat when driving but when I shut it off the temp climbs an climbs. For some reason the fans aren't coming on after I shut the car off. I have change both fan relays I read there was a 3rd fan fuse but not sure. Can anyone help plz. Fans work they come on when driving but not after the car bin shut off

Injuneer

The fans are not programmed to run after you shut down the engine.

There is a single fuse that supplies 12V to the control side of the two fan control relays, and a single fusible link at the red "+" box by the battery, that supplies 12V to the load side of the two relays. The late 94 models and up added a third relay, to control the fans in dual low speed/high speed mode. But your 93 uses two relays to control fan 1/fan 2.

But if your fans run correctly with the engine running (first fan on at 226*F, second fan on at 235*F) there is nothing wrong with the fuses or the relays.

Please post a topic only once. If you need to edit your post, use the "EDIT" button in the lower right corner of the post.

Thanks.

Jmj93z28

How do I program them its really hot were I live an the fans need to come on after I shut it off

Jmj93z28

I found a toggle switch inside the car underneat the steering will does any one know what this is for. Did somone add it or did the factory put it in

Injuneer

You would have to add an external switch so you could turn them on manually.

Courtesy of Shoebox

http://shbox.com/1/fan_sw_diagram1.jpg

It's normal for the engine temp to rise when you first shut down the engine. Normally, it doesn't hurt anything. What is the peak temperature you see after you shut the engine down?

shoebox

Not factory. No way of knowing what it is.

All engine temps rise immediately after you shut them off. Then, they cool. It's not going to hurt anything.

Jmj93z28

I'm not sure what the peek temp is its 2 lines b4 the red an the factory made it to where the fans are suppose to come on after the car bin shut off . Y didn't mine do that. Maybe I'm over worried its like 120 degrees were I live an I was told I have cast iron heads an I dnt want to replace them. Can you say expensive. Any help is appreciated

Jmj93z28

Totally off topic but what would cause a automatic 93 z28 to flood. I was told it could be the fuel regularor

Injuneer

Been playing with these cars since I bought mine new in 1994, and never heard of one that was set up from the factory to run the fans on when the engine was off.

This is Rob/Shoebox's Camaro/Firebird LT1 temp gauge visual.



The middle of the gauge is about 210*F. That's the normal engine operating temp. As long as it isn'[t going into the red, it isn't a problem. As noted earlier, with the engine running the first fan doesn't come on until the coolant reaches 226*F, and the second fan at 235*F. 235*-240*F is roughly the 3/4 point on the gauge.

All F-Body LT1's have aluminum heads. So do the Corvette LT1's. Only the Y-Body (SS/Roadmaster/Fleetwood) engines have cast iron heads. On the other hand, cast iron heads would be structurally more tolerant of very high temperatures than aluminum heads.

Jmj93z28

When I open the hood an were it tells you how to do the timing belt an acouple other things about the car it says that to be careful fans run when cars off. After driving it around when you shut it off shouldn't the fans come on to cool it,I could be wrong

DelSoto

You would be better suited to find a manual for a 93 Z28. Your car has a timing chain. They do not have timing belts. Wait....are you referring to the routing of the serpentine belt?

Injuneer

The label is generic. Probably used on every car GM makes.

Jmj93z28

so the fans on a 93 z28 are only suppose to be on when the cars on. Even after driving around an shutting it off

shoebox

Yes, as has been said several times. It's not a Honda.