Fans Not Working - ZR-1 Net Registry Forums

jdl308 · 06-02-2007

I have a 6000 mile 95 that I have just taken out of storage for the first time in about 5 years. I have only driven the car in cool weather until today and I noticed that the fans do not seem to turn on when the car is hot (+220 degrees). The fans do work when the AC is on. An ideas?

WB9MCW · 06-02-2007

I AM SURE OTHERS WILL CHIME IN---

I think that only one fan works normally unless you have the ac on and then the second fan comes into play-- until it gets real high like 230f-- even with ac off both would come on---hard for me to remember it was a while back.

I had a custom chip made up that brings my fan at 190f (both of em) and kicks out at 170f---best dawg gone mod to do indeed IMO---Now even on a super hot 95f summer day the engine max at a long standing idle only goes to 205f---no more of those saturated 230f temps for me!!! The 230f biz was for emmission reasons I was told or read somewhere.

I think your first fan might be broken is my guess or the control circuits perhaps---

lets see what others say!!!

BTW welcome to the forum.

jonszr1 · 06-02-2007

stk one fan on @223 2nd on @ 230. on thedrivers side of the fan shroud are the balasts(could be the wrong name for them , but if they come on with the air they are likely ok. i would just get one of the tuners henderson, haibeck ,jeffvette do prom changes changing the fan temps and the 1-4 shift 2 of the best modds. hope this helps

jdl308 · 06-03-2007

Thanks guys. I don't think the temp got up to 223. I thought it would be regulated around 195. This is in the area where the car likes to run when in motion. Mark Haibeck is local for me and his chip in on my list of things to do.

WB9MCW · 06-03-2007

I THOUGHT THE SAME THING! But then one day I was talking with another hot rod guy with my ZR-1 sitting at idle for about 10 min. I found out real quick how hot they get when your doing that. I suppose anyone who has been in a parade with a ZR-1 could tell you all about it.

Demps · 06-03-2007

Tell us about your '95. Ted

flyin ryan · 06-19-2007

i do up my own chips & when it comes to the fans i stagger the start temp. 5 degrees so it's not as big a draw on the electrical system all at once. either way getting them to turn on around the 200 number is a must to do. everthing will be much happier.

jdl308 · 06-22-2007

Saw Mark Haibeck. Verified both fans working properly. Installed his prom. Both fans on at 205, off at 195. Demps, car is green over beige, brought back to all original except for 4.10 gear (best bang for the buck!), installation of Grand Sport calipers (lots easier to clean), and Marks prom. I did remove a B&B exhaust and a never used DRM Wilwood GNIII front brake setup (shameless sales pitch

). Car just rolled over 6K miles.

Demps · 06-22-2007

Quote:

Originally Posted by jdl308

Saw Mark Haibeck. Verified both fans working properly. Installed his prom. Both fans on at 205, off at 195. Demps, car is green over beige, brought back to all original except for 4.10 gear (best bang for the buck!), installation of Grand Sport calipers (lots easier to clean), and Marks prom. I did remove a B&B exhaust and a never used DRM Wilwood GNIII front brake setup (shameless sales pitch

). Car just rolled over 6K miles.

Awesome car. My "used-to-be-uncle" owned that car. I know a little about it. Ted

06-02-2007	#1
jdl308 Join Date: Jun 2007 Location: Wheaton, IL Posts: 5	Fans Not Working I have a 6000 mile 95 that I have just taken out of storage for the first time in about 5 years. I have only driven the car in cool weather until today and I noticed that the fans do not seem to turn on when the car is hot (+220 degrees). The fans do work when the AC is on. An ideas?

06-02-2007	#2
WB9MCW Join Date: Dec 2003 Location: McHenry, Il. Posts: 6,607	Re: Fans Not Working I AM SURE OTHERS WILL CHIME IN--- I think that only one fan works normally unless you have the ac on and then the second fan comes into play-- until it gets real high like 230f-- even with ac off both would come on---hard for me to remember it was a while back. I had a custom chip made up that brings my fan at 190f (both of em) and kicks out at 170f---best dawg gone mod to do indeed IMO---Now even on a super hot 95f summer day the engine max at a long standing idle only goes to 205f---no more of those saturated 230f temps for me!!! The 230f biz was for emmission reasons I was told or read somewhere. I think your first fan might be broken is my guess or the control circuits perhaps--- lets see what others say!!! BTW welcome to the forum. __________________ http://i119.photobucket.com/albums/o...9mcw/SIG-2.jpg http://i119.photobucket.com/albums/o128/wb9mcw/vcm.gif "The Budget should be balanced, the Treasury should be refilled, public debt should be reduced, the arrogance of officialdom should be tempered and controlled, and the assistance to foreign lands should be curtailed, lest Rome will become bankrupt. People must again learn to work instead of living on public assistance." - Cicero, 55 BC " We the people are the rightful masters of both Congress and the courts, not to overthrow the Constitution but to overthrow the men who pervert the Constitution." - Abraham Lincoln Last edited by WB9MCW; 06-02-2007 at 09:29 PM.

06-02-2007	#3
jonszr1 Join Date: Sep 2006 Location: lone pine and mammoth lakes Posts: 1,407	Re: Fans Not Working stk one fan on @223 2nd on @ 230. on thedrivers side of the fan shroud are the balasts(could be the wrong name for them , but if they come on with the air they are likely ok. i would just get one of the tuners henderson, haibeck ,jeffvette do prom changes changing the fan temps and the 1-4 shift 2 of the best modds. hope this helps

06-03-2007	#4
jdl308 Join Date: Jun 2007 Location: Wheaton, IL Posts: 5	Re: Fans Not Working Thanks guys. I don't think the temp got up to 223. I thought it would be regulated around 195. This is in the area where the car likes to run when in motion. Mark Haibeck is local for me and his chip in on my list of things to do.

06-03-2007	#5
WB9MCW Join Date: Dec 2003 Location: McHenry, Il. Posts: 6,607	Re: Fans Not Working I THOUGHT THE SAME THING! But then one day I was talking with another hot rod guy with my ZR-1 sitting at idle for about 10 min. I found out real quick how hot they get when your doing that. I suppose anyone who has been in a parade with a ZR-1 could tell you all about it. __________________ http://i119.photobucket.com/albums/o...9mcw/SIG-2.jpg http://i119.photobucket.com/albums/o128/wb9mcw/vcm.gif "The Budget should be balanced, the Treasury should be refilled, public debt should be reduced, the arrogance of officialdom should be tempered and controlled, and the assistance to foreign lands should be curtailed, lest Rome will become bankrupt. People must again learn to work instead of living on public assistance." - Cicero, 55 BC " We the people are the rightful masters of both Congress and the courts, not to overthrow the Constitution but to overthrow the men who pervert the Constitution." - Abraham Lincoln

06-03-2007	#6
Demps Join Date: Jan 2006 Location: Niceville Posts: 998	Re: Fans Not Working Tell us about your '95. Ted

06-19-2007	#7
flyin ryan Join Date: Aug 2006 Location: Edmonton, Alberta or Phoenix, Arizona Posts: 2,741	Re: Fans Not Working i do up my own chips & when it comes to the fans i stagger the start temp. 5 degrees so it's not as big a draw on the electrical system all at once. either way getting them to turn on around the 200 number is a must to do. everthing will be much happier. __________________ There are no limit's mans ingenuity, just as mans ingenuity will never conquer the forces & behavior of this planet...Smokey Y.

06-22-2007	#8
jdl308 Join Date: Jun 2007 Location: Wheaton, IL Posts: 5	Re: Fans Not Working Saw Mark Haibeck. Verified both fans working properly. Installed his prom. Both fans on at 205, off at 195. Demps, car is green over beige, brought back to all original except for 4.10 gear (best bang for the buck!), installation of Grand Sport calipers (lots easier to clean), and Marks prom. I did remove a B&B exhaust and a never used DRM Wilwood GNIII front brake setup (shameless sales pitch ). Car just rolled over 6K miles.