high coolant temperature - Page 2 - ZR-1 Net Registry Forums

tomtom72 · 04-20-2012

Jano,

I agree with your observation from past years in that once the secondary fan does come on the coolant temp would drop enough to notice it on the gauge. I would look to see if the core has junk stuck in it. I also would think that if there was junk stuck in the core you would see the temps climb much faster than in previous years? I also would just check to make sure the secondary fan relay and the primary fan relay are both working correctly. Just to be sure I covered all the possibilities?

I hate to suggest pulling the shroud as that is a pain in the neck. Maybe you could look in thru the oil cooler side of the radiator or up thru the air intake opening at the front and get an indication if the car sucked up road junk into the core.

Tom

janozr1 · 04-20-2012

NONONONO guys everything that you sad is ok jus termperature between engine coolant and radiator is too much different whan fans working , so I think that thermosta 180f becomes too lasy.I will change it and i will report
what hapenning . Bay the way , where is temp.sensor located ?

GOLDCYLON · 04-20-2012

I think on the driver side injector housing. Follow the wires to it.

Kevin · 04-20-2012

Quote:

Originally Posted by janozr1

ok , but still dont understand why temp stay there and doesnt dropp if both fans are running , usually were fans put temperature down and turn off for awhile...

because that's normal operating range.

A26B · 04-20-2012

Coolant Temp Sensor Location Reference
Located on LH (Driver Side) Injector Housing, under the Plenum.

PN 12146312, 2 Pin (ECM) Coolant Temp Sensor
http://jerrysgaskets.com/store2/root...roducts_id=363

PN 25037346, Button Terminal (Guage) Coolant Temp Sensor
http://jerrysgaskets.com/store2/root...roducts_id=157

Thermostat
http://jerrysgaskets.com/store2/root...roducts_id=592

janozr1 · 04-20-2012

Thanks Jerry for info , first step will be replace thermostat it is easilly do that like change coolant sensor.
jano

Ccmano · 04-20-2012

Quote:

Originally Posted by sammy

have you pulled the radiator cover and see if the fins on your radiator are plugged . our cars are like a hoover vacuum cleaner . they gobble up every thing .plastic bags , leaves and small rodents .jk.i am willing to be that your radiator fins are partially plugged

Been there done that! This is your answer.... On first glance mine was clean, but on closer examination the fins of the radiator were plugged with fine sand. They all get this way after 20+ yrs. Had to replace the radiator. Might as well do the thermostat, hoses and belts while your in there. Like the old Fram commercial said "pay me now or pay me later"
H

janozr1 · 05-05-2012

I changed thetmostat today and coolant temp. is going down , fans go
off like before if car is not moving and temperature between radiator and engine is not so different .....SO I HAD BAD THERMOSTAT .
On the left side is old one , on the right is new - got it from germanny
Which one is original , or better or what ?
thanks for help,
regards ,Jano

A26B · 05-05-2012

The one on the left is the wrong thermostat.

scottfab · 05-05-2012

Quote:

Originally Posted by janozr1

I changed thetmostat today and coolant temp. is going down , fans go
off like before if car is not moving and temperature between radiator and engine is not so different .....SO I HAD BAD THERMOSTAT .
On the left side is old one , on the right is new - got it from germanny
Which one is original , or better or what ?
thanks for help,
regards ,Jano

The one on the right looks like mine. Glad temps seem to be better. I would suggest doing what was poster before about inspecting and cleaning the front of the radiator stack. It's just good maintenance. I installed this screen 14yrs ago and it saves a lot of time. I inspect the screen and clean it twice a year.
http://www.zr1netregistry.com/ZR1_radiatorscreen.htm

04-20-2012	#11
tomtom72 Join Date: Dec 2004 Location: Jacksonville, FL USA Posts: 4,637	Re: high coolant temperature Jano, I agree with your observation from past years in that once the secondary fan does come on the coolant temp would drop enough to notice it on the gauge. I would look to see if the core has junk stuck in it. I also would think that if there was junk stuck in the core you would see the temps climb much faster than in previous years? I also would just check to make sure the secondary fan relay and the primary fan relay are both working correctly. Just to be sure I covered all the possibilities? I hate to suggest pulling the shroud as that is a pain in the neck. Maybe you could look in thru the oil cooler side of the radiator or up thru the air intake opening at the front and get an indication if the car sucked up road junk into the core. Tom __________________ 1990 ZR-1, Black/grey, #2233, stock. ZR-1 Net Reg Founding Member #316 & NCM member

04-20-2012	#12
janozr1 Join Date: Jul 2005 Location: SLOVENIA,EU Posts: 126	Re: high coolant temperature NONONONO guys everything that you sad is ok jus termperature between engine coolant and radiator is too much different whan fans working , so I think that thermosta 180f becomes too lasy.I will change it and i will report what hapenning . Bay the way , where is temp.sensor located ?

04-20-2012	#13
GOLDCYLON Join Date: May 2007 Location: Peoria, AZ Posts: 9,147	Re: high coolant temperature I think on the driver side injector housing. Follow the wires to it. __________________ 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

04-20-2012	#15
A26B Join Date: Dec 2003 Location: Arcadia,OK Posts: 3,396	Re: high coolant temperature Coolant Temp Sensor Location Reference Located on LH (Driver Side) Injector Housing, under the Plenum. PN 12146312, 2 Pin (ECM) Coolant Temp Sensor http://jerrysgaskets.com/store2/root...roducts_id=363 PN 25037346, Button Terminal (Guage) Coolant Temp Sensor http://jerrysgaskets.com/store2/root...roducts_id=157 Thermostat http://jerrysgaskets.com/store2/root...roducts_id=592 __________________ Jerry Downey JERRYS LT5 GASKETS & PARTS http://www.jerrysgaskets.com 1994 *ZR-1, Black/Black, Lingenfelter Aerobody, 416cu in, 3.91 gears, coil-over susp, Brembo brakes, etc. 2016 Black-Red, 3LT-Z51 Auto 8-speed. Last edited by A26B; 04-20-2012 at 01:57 PM.*

04-20-2012	#16
janozr1 Join Date: Jul 2005 Location: SLOVENIA,EU Posts: 126	Re: high coolant temperature Thanks Jerry for info , first step will be replace thermostat it is easilly do that like change coolant sensor. jano

05-05-2012	#18
janozr1 Join Date: Jul 2005 Location: SLOVENIA,EU Posts: 126	Re: high coolant temperature I changed thetmostat today and coolant temp. is going down , fans go off like before if car is not moving and temperature between radiator and engine is not so different .....SO I HAD BAD THERMOSTAT . On the left side is old one , on the right is new - got it from germanny Which one is original , or better or what ? thanks for help, regards ,Jano

05-05-2012	#19
A26B Join Date: Dec 2003 Location: Arcadia,OK Posts: 3,396	Re: high coolant temperature The one on the left is the wrong thermostat. __________________ Jerry Downey JERRYS LT5 GASKETS & PARTS http://www.jerrysgaskets.com 1994 *ZR-1*, Black/Black, Lingenfelter Aerobody, 416cu in, 3.91 gears, coil-over susp, Brembo brakes, etc. 2016 Black-Red, 3LT-Z51 Auto 8-speed.