67Firebird455

iTrader: (27)

Ordered a damn mr. gasket that's supposed to fit late model LS1's, well, it's the kind for the newer housings where the neck and thermostat are two piece. Anyway, this is for my Tahoe, I ordered the 180, got it apart tonight, noticed the two were different, and pulled the stock thermo out (100C written on the top), and bolted it back together. The damn hoe runs the EXACT SAME temperature (1.5 lines shy of 210 on the gauge) as it does WITH the 100C (212F) thermostat. What gives? I'm baffled. It's in the 70's right now here, so the air is cool and it should cool it down WAY more than that. Any ideas?

67Firebird455

iTrader: (27)

BTW - Guessing these are like the old cars, and any liquid cooled engine for the most part... that without a thermostat, the water can't hang around long enough in the radiator to efficiently cool it down, but what are the odds it would run an identical temperature?

67goatman455

iTrader: (14)

uh that is weird, maybe it has to do with when the fan kicks on. if it kicks on at 190, then i assume it is still going to run that? BTW nice username, i was instantly drawn to your thread because of it, lol

67Firebird455

iTrader: (27)

LOL well ya know, the ol 67 used to have a 464ci solid roller setup, that has since been sold. Still have the car, just got back from working on our sandrail parked next to it at my grandparent's ranch. =\ Makes me kind of sad. Anyway... It's mechanical fan. Think they started that the year or so after 02 (go figure). Pretty crazy. Even cruising down the road @ 55mph, it runs 1.5 lines below 210.

BTW - what kinda engine setup are you runnin the GTO?

spy2520

iTrader: (3)

if the fan temps are stock then you wont notice much if any difference in temps. Also if you're gauges are anything like f-body gauges, everything after 98 read the same temp (just under 210) once warmed up, no matter what the temp was, unless it was actually overheating. I dont know if its the same for trucks though.

67Firebird455

iTrader: (27)

Last night, wife drove it home and it was sitting at about 225-230, so something's definitely wrong. Will have to check it out today. It doesn't have fan temps, it's a mechanical clutch-type fan on the front, no electric fans to program (I wish).

67Firebird455

iTrader: (27)

K, got my hypertech 180 thermo installed tonight, and the thing still runs the same temp... 1.5 lines below 210. What the hell?

vjo90rs8

iTrader: (9)

it has more to do with the limitations of the radiator and clutch fan than it does the thermostat. A lower stat isn't going to keep your car any cooler if your fan and radiator aren't up to the task. Just like a pot sitting on a hot stove, it doesn't matter when you add the water, it will eventually boil if there is no where to dissipate the heat.

67Firebird455

iTrader: (27)

Had thought the same thing too... But this radiator is huge, and I wouldn't think a mild 364 would generate this much heat. Ran the same temp with the 5.3 and it was stock too.

sixvi6-camaro

iTrader: (9)

A bubble in the system could cause the rise above 210 but constantly at 210 could just be a dummy gauge? since its on a truck I have no real idea. Try ask on performancetrucks.net (there is a tab at the top of the page to go there.) You should get a better response on there.