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post #1 of 7 (permalink) Old Oct 14th, 19, 06:27 PM Thread Starter
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Cooling issues

I have an issue I'm hopping someone in the forum cam help with. I installed a Holley Terminator EFI system and I love it. My issue is cooling. I continue to get erratic cooling temps. I'm running a Ron Davis radiator with dual spal fans programmed.#1 fan comes on at 190 and off at 185 #2 on at 197 and off 192. Thermostat is a new 180° with new CTS sensors. The gauge on the car will reach 191 and hold there for a few minutes before steam starts coming from the overflow then the thermostat opens and car cools down. Then if I drive the car in 77° weather or less down the highway the car cools way down to as low as 119°. I just want to regulate the temp to stay at least 160°. The CTS sensors are in the RPM air gap intake currently. My,next attempt is to buy Holley CTS sensors and install in the block but would love any advice that will help.
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post #2 of 7 (permalink) Old Oct 14th, 19, 10:46 PM
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Amazing that cools down to 119 with a 180 thermostat.
Maybe water pump issue ?

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post #3 of 7 (permalink) Old Oct 15th, 19, 06:31 AM
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Don
 
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Re: Cooling issues

Probably a stupid question but is your thermostat installed backwards?

Where is the temperature sensor for your fan controller.

Don

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post #4 of 7 (permalink) Old Oct 15th, 19, 07:41 AM
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Re: Cooling issues

with a 180* stat the temp when engine is warmed up will not go below 180*
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post #5 of 7 (permalink) Old Oct 15th, 19, 10:27 AM
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Re: Cooling issues

My dumb question is what type of engine Gen1, LS1-3? With a tstat opening of 180, why have fans that don't start til it hits the 190's? If your radiator cap is steaming at 191 then either the cap is weak or you've got a blockage somewhere.

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post #6 of 7 (permalink) Old Oct 15th, 19, 10:54 AM Thread Starter
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Gen1 383 with RPM intake and heads
Sensors are on the intake on either side of thermostat.
On my way to buy a new cap now.
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post #7 of 7 (permalink) Old Oct 15th, 19, 10:55 AM Thread Starter
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Thermostat is in correctly. I did have to replace the o-ring in the thermostat housing.
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