TB removal and then some!!! - ZR-1 Net Registry Forums

Roadster · 12-29-2017

Had a new development occur today as I was headed to the WAZOO New Years luncheon. Got an early start and everything was going well......until I looked at the coolant temp on the highway.....I noticed the temp was at 159-160* @70mph and above....just hovering there....so I loop around to go back home.....not wanting to chance the over 2 hour drive each way with what may be a sticking thermostat.
Although the outside temp here is 19-21* and I did the TB coolant bypass months ago....I don't think that it have a 40* swing effect on the temp.....
Now getting off the highway and back on local roads......the temp now goes up to operating range.....200* or higher when stopped for a light....but then still drops to 196* and lower to about 187* when moving....and through all of this the engine is running fine.....and the idle remains to be perfect with each stop..
Got back home fine.....now to figure out the problem......

12-29-2017	#10
Roadster Join Date: Mar 2014 Location: Warrington PA Posts: 1,914	Re: TB removal and then some!!! Had a new development occur today as I was headed to the WAZOO New Years luncheon. Got an early start and everything was going well......until I looked at the coolant temp on the highway.....I noticed the temp was at 159-160* @70mph and above....just hovering there....so I loop around to go back home.....not wanting to chance the over 2 hour drive each way with what may be a sticking thermostat. Although the outside temp here is 19-21* and I did the TB coolant bypass months ago....I don't think that it have a 40* swing effect on the temp..... Now getting off the highway and back on local roads......the temp now goes up to operating range.....200* or higher when stopped for a light....but then still drops to 196* and lower to about 187* when moving....and through all of this the engine is running fine.....and the idle remains to be perfect with each stop.. Got back home fine.....now to figure out the problem...... __________________ Tom 1994 ZR-1 #009 "captured test fleet car" 1974 LS4 454 Vert 1974 L-82 355 Vert. 1982 L83 CFI...now a retired "dd"....Sold WAZOO Member Last edited by Roadster; 12-29-2017 at 01:50 PM.