engine temps??

Tech discussions on the L77 6.0L V8.
cerbomark
Posts: 316
Joined: Tue Oct 02, 2018 5:37 pm
Location: upstate NY

Re: engine temps??

Post by cerbomark »

CrashTestDummy wrote: Mon May 27, 2019 3:22 pm that sounds about right. Did the cooling fan recall go all the way to 2016?
car has been at dealer for other recall(seat belt) and they didn't t say anything so I would assume it didn't go to 2016.
But I still can t understand the temps I saw a week ago.
2016 C1
CrashTestDummy
Posts: 2300
Joined: Sat Feb 07, 2015 2:31 pm
Location: Pearland, Texas

Re: engine temps??

Post by CrashTestDummy »

cerbomark wrote: Mon May 27, 2019 8:26 pm
CrashTestDummy wrote: Mon May 27, 2019 3:22 pm that sounds about right. Did the cooling fan recall go all the way to 2016?
car has been at dealer for other recall(seat belt) and they didn't t say anything so I would assume it didn't go to 2016.
But I still can t understand the temps I saw a week ago.
Well, the recall was for a worn and/or noisy fan motor, and the following is dated 2015, so may not apply:

https://www.newcaprice.com/files/coolingfan.pdf

But being worn, it may not spin up to speed, or fail to start when needed. That could cause a temp spike. While the notice above doesn't apply to the '16, it can't hurt to check, since the car is already at the dealer.
Gene Beaird,
Pearland, Texas
2012 Caprice 9C1
1992 B4C 1LE Camaro
2018 Tahoe PPV (her car)
1995 DGGM Impala SS
1985 Firebird - 310 LS1 C Prepared autocross car.
1980 Bluebird Wanderlodge
And some others
Do YOU have my SPID?
SSpeedracer
Posts: 149
Joined: Tue Mar 13, 2018 6:34 pm

Re: engine temps??

Post by SSpeedracer »

240 is too high. High temp at speed implies water pump instead of fan failure.
2016 Caprice
cerbomark
Posts: 316
Joined: Tue Oct 02, 2018 5:37 pm
Location: upstate NY

Re: engine temps??

Post by cerbomark »

SSpeedracer wrote: Tue May 28, 2019 10:30 pm 240 is too high. High temp at speed implies water pump instead of fan failure.
my question then is how did I see that only happen once?
2016 C1
CrashTestDummy
Posts: 2300
Joined: Sat Feb 07, 2015 2:31 pm
Location: Pearland, Texas

Re: engine temps??

Post by CrashTestDummy »

Air in the cooling system will do that. We swapped in a 5L LS1 into our 3rd Gen Firebird autocross car, and although I thought I got all the air out, the first handful of events I'd see the temp gauge momentarily-spike to 230+ Deg-F. The spike would usually last for about 10-20 seconds then drop back down to a normal range (~180-200).

The first couple of times I almost wet myself and immediately shut the car off. After seeing it a few times, and after I had already verified we had zero leaks, I'd just watch the spike. Sure enough, it would spike, then after a few seconds of running, drop back down. After about 5 or 6 events, that issue is history.
Gene Beaird,
Pearland, Texas
2012 Caprice 9C1
1992 B4C 1LE Camaro
2018 Tahoe PPV (her car)
1995 DGGM Impala SS
1985 Firebird - 310 LS1 C Prepared autocross car.
1980 Bluebird Wanderlodge
And some others
Do YOU have my SPID?
cerbomark
Posts: 316
Joined: Tue Oct 02, 2018 5:37 pm
Location: upstate NY

Re: engine temps??

Post by cerbomark »

CrashTestDummy wrote: Thu May 30, 2019 10:12 am Air in the cooling system will do that. We swapped in a 5L LS1 into our 3rd Gen Firebird autocross car, and although I thought I got all the air out, the first handful of events I'd see the temp gauge momentarily-spike to 230+ Deg-F. The spike would usually last for about 10-20 seconds then drop back down to a normal range (~180-200).

The first couple of times I almost wet myself and immediately shut the car off. After seeing it a few times, and after I had already verified we had zero leaks, I'd just watch the spike. Sure enough, it would spike, then after a few seconds of running, drop back down. After about 5 or 6 events, that issue is history.
I did think of that but wasn't t sure if it was possible with no leaks and nothing done to the system (probably ever).I do check the level often and never had to add any. Thanks
2016 C1
cerbomark
Posts: 316
Joined: Tue Oct 02, 2018 5:37 pm
Location: upstate NY

Re: engine temps??

Post by cerbomark »

Just to report back, what I had found was that replacing the radiator cap has solved the issues. I would notice upon cool down that the lower hose would collapse from suction I assume. After the new cap this no longer happens and the temps don't spike as high.
2016 C1
SSpeedracer
Posts: 149
Joined: Tue Mar 13, 2018 6:34 pm

Re: engine temps??

Post by SSpeedracer »

Glad it was easy fix. thanks for posting solution
2016 Caprice
Post Reply