Coolant Temp is Spiking

whiskeyfed · 02-01-2021, 02:50 PM

Hi... Been a while!!!

I've brought my car to the dealership a few times for this issue.

Start the car, let her warm up and get going.

About 2.5 miles of backroads to highway. Normal operating temp for this model seems to be around 197-203f. By the time i get to the highway, i am at 220ish.

Get on the highway and the coolant temp spikes to 230-240 and then slowwwwwwly drops back to 203-206 range.

Get off the highway at a stop light, car immediately begins to spike again, fan comes on, coolant gets up to 217-220 at a light for 20-30 seconds. Start driving and it only gets down to 212, fan on high.

My experience is that my fan is kicking on around 206-208 range and really starts kicking around 215.

This happens regardless of outside temp, regardless of driving style.

First couple times they flushed the coolant and it worked for 5-6 months, only to have to bring it back again.

In traffic, or only driving backroads, the temp rarely dips below 208 (which is OK, but still not normal.

I'm kind of done bringing it back over and over again for a coolant flush and Chevy dealership could care less about looking into the cause. They are telling me 220 is "normal" even though my fan is BLASTING on high and the temp gauge is above normal.

Any advice beyond a fan issue/radiator malfunction/thermostat? On the highway for a while it is fine, but takes quite a while to get back to normal operating temps once I merge on.

StPeteHyper2.0 · 02-02-2021, 12:32 PM

I'd start with the thermostat. That's the only malfunction I could see other than the fan.

Start The Machine · 02-05-2021, 11:08 AM

Yes, it's more than likely the thermostat. Also 220° is not normal. That is very hot for these cars!

Jhoceva · 03-21-2021, 09:23 AM

Quote:

Originally Posted by whiskeyfed

Hi... Been a while!!!

I've brought my car to the dealership a few times for this issue.

Start the car, let her warm up and get going.

About 2.5 miles of backroads to highway. Normal operating temp for this model seems to be around 197-203f. By the time i get to the highway, i am at 220ish.

Get on the highway and the coolant temp spikes to 230-240 and then slowwwwwwly drops back to 203-206 range.

Get off the highway at a stop light, car immediately begins to spike again, fan comes on, coolant gets up to 217-220 at a light for 20-30 seconds. Start driving and it only gets down to 212, fan on high.

My experience is that my fan is kicking on around 206-208 range and really starts kicking around 215.

This happens regardless of outside temp, regardless of driving style.

First couple times they flushed the coolant and it worked for 5-6 months, only to have to bring it back again.

In traffic, or only driving backroads, the temp rarely dips below 208 (which is OK, but still not normal.

I'm kind of done bringing it back over and over again for a coolant flush and Chevy dealership could care less about looking into the cause. They are telling me 220 is "normal" even though my fan is BLASTING on high and the temp gauge is above normal.

Any advice beyond a fan issue/radiator malfunction/thermostat? On the highway for a while it is fine, but takes quite a while to get back to normal operating temps once I merge on.

I am having a similar issue although my temps are not quite as hot. Usually my car runs at a steady 178 while cruising. Now suddenly its going from 194-201 about every 6 or 7 seconds, regardless of outside temp or vehicle speed. Did you ever figure out what was causing this?

V8Bully · 03-26-2021, 12:08 PM

195 is normal operating temp.

02-01-2021, 02:50 PM	#1
whiskeyfed Pat Drives: 2017 Camaro 1LT I4 Turbo A8 Join Date: Nov 2016 Location: Stratford, CT Posts: 827 View My Garage	Coolant Temp is Spiking Hi... Been a while!!! I've brought my car to the dealership a few times for this issue. Start the car, let her warm up and get going. About 2.5 miles of backroads to highway. Normal operating temp for this model seems to be around 197-203f. By the time i get to the highway, i am at 220ish. Get on the highway and the coolant temp spikes to 230-240 and then slowwwwwwly drops back to 203-206 range. Get off the highway at a stop light, car immediately begins to spike again, fan comes on, coolant gets up to 217-220 at a light for 20-30 seconds. Start driving and it only gets down to 212, fan on high. My experience is that my fan is kicking on around 206-208 range and really starts kicking around 215. This happens regardless of outside temp, regardless of driving style. First couple times they flushed the coolant and it worked for 5-6 months, only to have to bring it back again. In traffic, or only driving backroads, the temp rarely dips below 208 (which is OK, but still not normal. I'm kind of done bringing it back over and over again for a coolant flush and Chevy dealership could care less about looking into the cause. They are telling me 220 is "normal" even though my fan is BLASTING on high and the temp gauge is above normal. Any advice beyond a fan issue/radiator malfunction/thermostat? On the highway for a while it is fine, but takes quite a while to get back to normal operating temps once I merge on. __________________ Follow me on Instagram @whiskeyfed Subscribe on YouTube Whiskeyfed Camaro Follow my Build Thread The WhiskeyFed Camaro Current Modifications: JacFab Boost-O-Lator, Injen Evolution CAI, ZZP Catless Downpipe, RPM 3" Charge Pipe, Mishimoto Oil Filtration/Coolant Systems, R1 Concepts Brakes Package, Eibach Pro-Kit Lowering Springs, PTP Lava Exhaust Wrap & Turbo Blanket DYNO SHEET: 297whp / 374wtq Tuned by #danytechtuning

02-05-2021, 11:08 AM	#3
Start The Machine Drives: 2016 M6 2.0T Join Date: Nov 2016 Location: Gig Harbor, WA Posts: 839	Yes, it's more than likely the thermostat. Also 220° is not normal. That is very hot for these cars! __________________ RS Package, HD Cooling Package, Brembo 6 Piston Front Brakes, SRP Racing Pedals, Soler Performance Throttle Controller, Dyno Tuned by Trifecta, Velossa Tech Ram Air, Mishimoto Intake, aFe Air Filter, Mishimoto Charge Pipes, ZZP 67mm Throttle Body, Trifecta T40 Stage 2 Turbo, JacFab Recirculation Valve, PTP Turbo Blanket, ZZP Catted Downpipe, Mishimoto Pro Cat-Back Quad Tip Exhaust, Mishimoto Catch Cans, Mishimoto Coolant Reservoir Tank, GM SEMA Grill, Ikon Motorsports Front Fascia Extension, Ikon Motorsports 1LE Spoiler, American Authority ZL1 Side Skirts, AMPP Quad Tip Rear Valance

02-02-2021, 12:32 PM	#2
StPeteHyper2.0 Drives: '16 Hyper Blue 2.0 Join Date: Mar 2018 Location: St Pete Posts: 238 View My Garage	I'd start with the thermostat. That's the only malfunction I could see other than the fan.

03-26-2021, 12:08 PM	#5
V8Bully Drives: 2016 ATS LTG Join Date: Apr 2020 Location: South Florida Posts: 5	195 is normal operating temp.

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