Re: 99 5.3 z71 overheating?
Group: alt.autos.4x4.chevy-trucks Date: Mon, May 30, 2005, 10:32pm
(CDT+5) From: firstname.lastname@example.org (shiden_kai)
I have a 99 chevy z71 with the 5.3. Whenever i get over about 65, it
used to spike from around 175-180, to almost 210 on the gauge. Anyway, i
replaced the thermostat with a duralast thermostat from autozone and
flushed the radiatior, put new anti freeze in it. It used to only run
hot when i got up to those speeds, but with the radiator flushed and new
thermostat, it's running at about 208 or so after i just let it idle up.
I haven't driven it since i replaced it and did the work, i just let it
run 10-15 minutes when i saw it jump like that. is this a normal temp
for a 99 5.3? is the thermostat ok? it said it was a 194 degree, but the
guy said that's what it needed to make the computer still work
correctly. any input would be really appreciated.
My input would be....get an original GM thermostat and stick that in
there before you do anything else. Obviously, you need to make sure
there is no air in the system, but frankly, the new generation v-8
doesn't have any real problems with that. You fill the overflow tank
while you run the engine, and it will pretty much autobleed itself.
True ....After you let it sit was it low on coolant?
If he just filled it up and put the cap on the first time you ran it it
wld spike unless you let it run with the cap off to burp it...But your
right they do autobleed them selfs...By now he sholuld be low on coolant
if it was air...