need help, 160 thermostat in 99Z - Team Camaro Tech
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post #1 of 8 (permalink) Old May 5th, 01, 10:59 AM Thread Starter
 
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i'm about ready to put my 160 thermo in my 99 z28, but i don't see an air bleed valve in the system to bleed the air off when refilling with coolant. i'm sure plenty of you out there have a 160 in your Z... did you have to bleed the system or not??

thanks
craig
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post #2 of 8 (permalink) Old May 5th, 01, 05:27 PM
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Think about this, if the engine does not achieve high enough temp, the computer will not go into closed loop, and if you have an automatic trans, the torque converter will not lock up until the proper temp is reached, and I've heard that will damage the trans if it does not lock up the torque converter, I think it overheats the trans.
Your mileage will suffer a lot.
Get some good info before doing this.

The real regulator of engine temp is the fan switch, which is set at a higher temp than the stat.
If the fan switch is not changed to a lower setting, the coolant may not cool down at all under slow driving conditions due to the fan not running.
But when in cooler weather or at freeway speeds, the temp may drop low enough to prevent closed loop running.
The computer may need re calibration to get what you want.
David

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[This message has been edited by davidpozzi (edited 05-06-2001).]
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post #3 of 8 (permalink) Old May 6th, 01, 08:30 AM
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As David says, 160 is not hot enough - don't do it. If you have a basic cooling system problem, changing the thermostat to a lower rating won't cure it. Why do you want to change it?

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post #4 of 8 (permalink) Old May 6th, 01, 09:38 AM
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Guys - I think what Craig is asking about is a common mod done to 4th gen LT-1 and LS-1 cars. The stat doesn't actually cause the engine to run much cooler. When the computer is programed for the new stat (manditory for proper operation) it tells the knock sensor to lighten up a bit allowing for more advance. SLP sells a kit and there are many others selling them as well. One type you reprogram the computer another you put something inline that tricks the computer.

Craig - my '96 has the bleed screw right on the neck of the thermostat housing where the upper hose attaches...

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post #5 of 8 (permalink) Old May 6th, 01, 11:17 AM
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Dennis is right, these late model F-body's run HOT! Sitting in traffic, its not uncommon for the temp gauge to peg out. The 160 stat doesnt really keep it any cooler in normal driving but in traffic it can be a godsend.
My 95 Z28 has 2 bleeder valves, but I have the LT-1, I cant really say about the LS1.
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post #6 of 8 (permalink) Old May 9th, 01, 04:55 PM Thread Starter
 
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thanks guys. i guess i didn't fully explain myself. i was installing the hypertech power programmer and it recommended doing it concurrently with a 160 stat, since it will reprogram the computer to have much lower "on" temperatures for the fan, as well as other computer loops. i did find out, however, that 99 Z's don't have any air bleed valve at all. so anyway, thanks for the advice, she seems to be running a little cooler, and maybe it's just in my head, but i think i feel the little extra punch from the hypertech...
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post #7 of 8 (permalink) Old May 9th, 01, 07:26 PM
 
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<BLOCKQUOTE>quote:</font><HR>Originally posted by camaro305hp:
thanks guys. i guess i didn't fully explain myself. i was installing the hypertech power programmer and it recommended doing it concurrently with a 160 stat, since it will reprogram the computer to have much lower "on" temperatures for the fan, as well as other computer loops. i did find out, however, that 99 Z's don't have any air bleed valve at all. so anyway, thanks for the advice, she seems to be running a little cooler, and maybe it's just in my head, but i think i feel the little extra punch from the hypertech...<HR></BLOCKQUOTE>

305HP, I just recently installed the same stat on my brothers '00 Z28 and I was looking for a minute for that damn bleeder and to find out later myself they don't have one, well anyway I just wanted to tell you if you have an automatic you must get a TRANS COOLER! Believe me you will need it and your trans will love it, because it would get to the point where it was so hot that it would not power break at the track.
And it would stay in 3rd gear the whole way down.

Sorry for the long story but figured I would save you or someone else the grief down the road.


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post #8 of 8 (permalink) Old May 10th, 01, 02:39 AM
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I did this on my 97 GMC. After a few driving cycles, the air purged. Keep an eye on the overflow container and keep it filled correctly. The problem will resolve itself. I like the Hypertech. You can also firm up shifts and change speedo readings for different tire sizes - nice when going back and forth with snows.(!)
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