Overheating - ZR-1 Net Registry Forums

DTZ ZR1 · 08-23-2010

When in stop and go traffic coolant temp gets up to 250 degrees. Once I get moving it drops down to normal temps. I have changed the thermostat. I am thinking that it is the coolant temp sensor for the ECM. I figured that if it is that that I would also change the sensor for the gauage. Question is are they the same type of sensors and also am I on the right track with my troubleshooting? Thanks for any advice.

XfireZ51 · 08-24-2010

Quote:

Originally Posted by DTZ ZR1

When in stop and go traffic coolant temp gets up to 250 degrees. Once I get moving it drops down to normal temps. I have changed the thermostat. I am thinking that it is the coolant temp sensor for the ECM. I figured that if it is that that I would also change the sensor for the gauge. Question is are they the same type of sensors and also am I on the right track with my troubleshooting? Thanks for any advice.

You may want to put a scan tool on it and see if the gauge reading matches the CTS signal to the ECM

Pete · 08-24-2010

Do not drive it at those temps you could blow a head gasket,don't ask me how i know.

If she starts to get hot even in stoped traffic rev RPM's to about 2k she will cool down a bit,it will pump more water thru the motor.

I would check make sure both fans are working, also check/clean front of radiator

Pete

Kb7tif · 08-25-2010

Install a switch to turn on BOTH fans when you want, or burn a chip to turn fans on at 190.

GOLDCYLON · 08-25-2010

Its prob time for a radiator replacement. You might be able to remove it clear out all the leaves and debries and get all the sand and silt out from between the fins. But this would be my guess since I been down this road with 3 C4s already. A regualr GM replacement radiator solved the problem each time

batchman · 08-28-2010

Quote:

Originally Posted by DTZ ZR1

When in stop and go traffic coolant temp gets up to 250 degrees. Once I get moving it drops down to normal temps.

Your radiator fan is not running. General suggestions that can help if you find yourself in this situation:

- turn on max a/c, most cars this forces fan on if it's operable

If that fails to drop temp within 30 sec or so,

- turn on max heat

This uses the heater core as a cooler. Yes the cabin will be unbearable but it will drop the engine temp.

Good luck,
- Jeff

L8apex · 08-29-2010

Here is what it is likely to look like when you pull the radiator shroud. I could not believe how much cooler my water and oil temps were once this was cleaned out!

Uploaded with ImageShack.us

Hammer · 08-29-2010

Just went through this. The left fan motor was not working. Runs fine now.

rhipsher · 08-29-2010

Quote:

Originally Posted by L8apex

Here is what it is likely to look like when you pull the radiator shroud. I could not believe how much cooler my water and oil temps were once this was cleaned out!

Uploaded with ImageShack.us

I think I see Jimmy Hoffa's wallet in there.

Coupe89 · 08-30-2010

Quote:

Originally Posted by L8apex

Here is what it is likely to look like when you pull the radiator shroud. I could not believe how much cooler my water and oil temps were once this was cleaned out!

Uploaded with ImageShack.us

Thats what mine looked like yesterday Also has a skiddle wrapper and 3 to 4 plastic wrappers....

08-23-2010	#1
DTZ ZR1 Join Date: Jan 2009 Location: Mansfield, OH Posts: 28	Overheating When in stop and go traffic coolant temp gets up to 250 degrees. Once I get moving it drops down to normal temps. I have changed the thermostat. I am thinking that it is the coolant temp sensor for the ECM. I figured that if it is that that I would also change the sensor for the gauage. Question is are they the same type of sensors and also am I on the right track with my troubleshooting? Thanks for any advice.

08-24-2010	#3
Pete Join Date: Dec 2003 Location: Chicagoland,IL Posts: 2,667	Re: Overheating Do not drive it at those temps you could blow a head gasket,don't ask me how i know. If she starts to get hot even in stoped traffic rev RPM's to about 2k she will cool down a bit,it will pump more water thru the motor. I would check make sure both fans are working, also check/clean front of radiator Pete __________________ '91 #1635 PoloGreen 350 LT5 11.09 @ 129.27 11.04 @ 128.86 474RWHP 400RWTQ http://www.youtube.com/watch?v=SFNFOhGGlR4 http://www.youtube.com/watch?v=ZlRIOMwaDYY https://sites.google.com/site/peteszr1garage

08-25-2010	#4
Kb7tif Join Date: May 2009 Location: S Nevada Posts: 351	Re: Overheating Install a switch to turn on BOTH fans when you want, or burn a chip to turn fans on at 190.

08-25-2010	#5
GOLDCYLON Join Date: May 2007 Location: Peoria, AZ Posts: 9,117	Re: Overheating Its prob time for a radiator replacement. You might be able to remove it clear out all the leaves and debries and get all the sand and silt out from between the fins. But this would be my guess since I been down this road with 3 C4s already. A regualr GM replacement radiator solved the problem each time __________________ 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

08-29-2010	#7
L8apex Join Date: Sep 2004 Posts: 35	Re: Overheating Here is what it is likely to look like when you pull the radiator shroud. I could not believe how much cooler my water and oil temps were once this was cleaned out! Uploaded with ImageShack.us Last edited by L8apex; 08-29-2010 at 07:47 PM.

08-29-2010	#8
Hammer Join Date: Apr 2006 Location: Ideho Posts: 2,647	Re: Overheating Just went through this. The left fan motor was not working. Runs fine now.