What themostat to run

Chevyguy · 09-04-2001, 08:34 AM

I have a 90 Coupe slowly transforming from a stone stock somewhat neglected state.

I need to swap out the original Tstat soon. Should I get a 160° unit?? I have a 3 core rad and a flex fan ( too many cracks in the stock plastic for my taste, and clutch was on its way out) On some of the hot days with the AC it got to 200° or a little higher and would bounce down then back up, sounds like the Tstat cycling to me. It used to never move off 170 previously.

So any suggestions for a mostly stock motor t stat temp would be appreciated

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Frank W
90 5.0 LX coupe Daily driver. Silencer removed, K&N filter. Flexalite fan, 3 core radiator. FMS flywheel and Clutch, FMS blue wires Energy Suspension end links
88 Notch 2.3L 5 speed Parts/beater car My two Notchbacks

74 Chevy Laguna Type S-3 305 Finally fixed getting a 454 to put in garage
<A HREF="http://www.chevellepages.com/folingo" TARGET=_blank>www.chevellepages.

09-04-2001, 08:34 AM	#1
Chevyguy Backyard Mechanic/Chemist Join Date: Feb 2001 Location: Acton MA USA Posts: 435	What themostat to run I have a 90 Coupe slowly transforming from a stone stock somewhat neglected state. I need to swap out the original Tstat soon. Should I get a 160° unit?? I have a 3 core rad and a flex fan ( too many cracks in the stock plastic for my taste, and clutch was on its way out) On some of the hot days with the AC it got to 200° or a little higher and would bounce down then back up, sounds like the Tstat cycling to me. It used to never move off 170 previously. So any suggestions for a mostly stock motor t stat temp would be appreciated ------------------ Frank W 90 5.0 LX coupe Daily driver. Silencer removed, K&N filter. Flexalite fan, 3 core radiator. FMS flywheel and Clutch, FMS blue wires Energy Suspension end links 88 Notch 2.3L 5 speed Parts/beater car My two Notchbacks 74 Chevy Laguna Type S-3 305 Finally fixed getting a 454 to put in garage <A HREF="http://www.chevellepages.com/folingo" TARGET=_blank>www.chevellepages.