Cooling fans won't turn on - ZR-1 Net Registry Forums

viperbaron · 11-03-2014

My ZR-1 has been in storage for 2.5 years. All seemed to be OK on it, but it was running hot, so I waited to see if the cooling fans turn on...they do not.
Fans will turn freely by hand, no wires appear to have been chewed through, relays have been reseated and no fuses blown.

Is there an "easy" way to check what might be the malfunction?

GOLDCYLON · 11-03-2014

Do the fans turn on with the AC on? That should should at least turn on the seconday fan.

gbrtng · 11-03-2014

Add freon to the AC maybe ... if the system is charged, both fans should run when AC is requested. If the system needs to be charged, the
fans won't run and an indicator LED will flash on the control head.

Pete · 11-03-2014

Quote:

Originally Posted by viperbaron

My ZR-1 has been in storage for 2.5 years. All seemed to be OK on it, but it was running hot, so I waited to see if the cooling fans turn on...they do not.
Fans will turn freely by hand, no wires appear to have been chewed through, relays have been reseated and no fuses blown.

Is there an "easy" way to check what might be the malfunction?

I'm thinking you already checked fuses at fuse box.

Check the fuseable links behind the battery one of those is power (+) to the fans i have found link to be good but wire inside insulator was caroded

Get a volt meter check each wire for continuity from the screw post and
about 2 inches past the fused link.

Pete

gbrtng · 11-04-2014

If you have no diagnostic tools, here is the quickest way to check the fan circuits.
On the AC hard line along the RH side there are two electrical connectors. Disconnect the rear (smaller) one and turn the ignition on - both fans should run - I don't think the engine has to be running.

viperbaron · 11-05-2014

See attached photos.
The fans will spin when jumpered in a test from the battery power connector to the fan lead on the relay connector. Replaced the relays and still no workie.
Yes, the indicator is flashing on initial engine start up. So, I'm off to the parts store to get some Freon to see if that helps.
UPDATE: Freon did not help. AC clutch never comes on. I never get voltage on the lead for the blue & black wire and the Blue & White wire.

11-03-2014	#1
viperbaron Join Date: Jun 2009 Location: Kabul, Afghanistan Posts: 12	Cooling fans won't turn on My ZR-1 has been in storage for 2.5 years. All seemed to be OK on it, but it was running hot, so I waited to see if the cooling fans turn on...they do not. Fans will turn freely by hand, no wires appear to have been chewed through, relays have been reseated and no fuses blown. Is there an "easy" way to check what might be the malfunction? __________________ [COLOR=seagreen][B]'91 ZR-1[/B][/COLOR], [COLOR=blue]'97 Viper GTS[/COLOR], [COLOR=red]'80 Vette[/COLOR], [COLOR=sienna]'06 F-250[/COLOR], [COLOR=lime]'98 ZRX-1100[/COLOR], [COLOR=blue]'09 Vulcan[/COLOR], [COLOR=red]'87 FJ-1200[/COLOR]:flag:

11-03-2014	#2
GOLDCYLON Join Date: May 2007 Location: Peoria, AZ Posts: 9,153	Re: Cooling fans won't turn on Do the fans turn on with the AC on? That should should at least turn on the seconday fan. __________________ GOLDCYLON - 91 ZR-1 #2014 GOLDCYLON - 90 ZR-1 #2794, 4L60e (Formerly Schrade's) GOLDCYLON - 11 CTS-V Arizona State Director 91 WHITE/BLACK #2014. 380 P&P&PCed,Ported Heads, Jeal Long tubes, Corsa Exhaust/FIKSE FM-5s /LED TLs, LED Headlights, Front Wilwood 6 piston narrowlite calipers and rear Wilwood caliper street shop mod,CNCed Coolant Pipes,TPI Cvr,Filter cover,Stainless Bolts, DRM/DOM PROM /ZFDOC mod build #102,DRLs,BMAD with stainless Debris Screen,Coplan Air Blaster, Pioneer APP Radio 4,Brey-Krause HB,Sub Bar,Fire extinguisher seat mount,DRM Coilovers,LEDs everywhere,Compass mirror (orange),V1 DIC hidden display, Homelink sun visor, Carbon Fiber top x3 and APSIS Carbon Fiber interior, APSIS CF Steering Wheel/NAPA Leather, Banski trailing arms, Guldstrand front suspension,urethane bushings from Prothane (total suspension) ZFDoc drive shaft safety loop, raptor shift light (orange),AO engineering louver front plate, Console seat cushion, 96CE seats with black custom Sheepskins, ss billet catch can,Viper remote entry/alarm,Cragar Rear Louvers,LED side louver lights, Dewitts Radiator with SPAL fans and a Woods 160 T-Stat 90 RED/BLACK #2794. 4L60e Automatic Stage V by RPM Transmission, TCI Dedicated TCM, OBX Stainless Headers, Corsa Exhaust, SAN Secondaries and Haibeck PROM, Exotic Muscle Coil overs, LED Interior Lights, LED Tail Lights, LED Headlights, 94 Sport seats with black custom Sheepskins , Cragar rear louvers, GS Front calipers, Banski Trailing arms, APSIS Carbon Fiber steering wheel, Front and Rear Baer Eradispeeds, DRLs, Guldstrand front suspension,urethane bushings from Prothane (total suspension), Dewitt's Raditor with Dual SPAL fans and a Haibeck 170 T-Stat 11 RED/GREY CTS-V

11-03-2014	#3
gbrtng Join Date: Feb 2006 Location: San Antonio area Posts: 1,179	Re: Cooling fans won't turn on Add freon to the AC maybe ... if the system is charged, both fans should run when AC is requested. If the system needs to be charged, the fans won't run and an indicator LED will flash on the control head. __________________ “Buy the best example of what you want, and pay whatever it takes. That way, you cry only once.” ~ Bruce Meyer Last edited by gbrtng; 11-03-2014 at 05:27 PM.

11-04-2014	#5
gbrtng Join Date: Feb 2006 Location: San Antonio area Posts: 1,179	Re: Cooling fans won't turn on If you have no diagnostic tools, here is the quickest way to check the fan circuits. On the AC hard line along the RH side there are two electrical connectors. Disconnect the rear (smaller) one and turn the ignition on - both fans should run - I don't think the engine has to be running. __________________ “Buy the best example of what you want, and pay whatever it takes. That way, you cry only once.” ~ Bruce Meyer