Re: Bouncing temperature on 85' K5
Group: alt.autos.4x4.chevy-trucks Date: Sun, Jan 11, 2004, 11:52pm
(CST+6) From: firstname.lastname@example.org (KJ)
1985 Chevrolet K5 162,000 miles 305CUI
My temperature bounces from just below 210 and 235, sometimes going as
high afs 265. This is after the engine has warmed up, is running just
Happens at 35MPH, 70MPH, 0MPH (IE speed doesn't seem to affect it.)
My thoughts, in order:
A: Failing fan clutch
B: Failing temp sensor
C: Failing t-stat
Seeing as how you just had slush/air in the system, I'd bet it's just
some air in the system. Burp her for 10-15 minutes and see if that
helps. A venting rad cap makes this process MUCH easier and MUCH less
messy! Well worth the $5.
It was actually happening before.
How do I "burp" her. Do you mean running it with the cap off?
Also, I have the small hole on the radiator that the previous owner
fixed with JB Weldbond. It is weeping slightly. Could this be
attributing to it? If so I'll have to chip it off and braze it.
No running it without a T-Stat will not harm your system...Why would it?
It will just take longer to heat up if you want to like use your heater
or something....It is a Very common Down here where i live to getem in
with out stats...Also I didnt say keep it out i said pull it out and run
it to see if he had the same problem....If not it would have been up to
him to put it back or replace it..Personally I wouldnt run it all the
time without it....Also no dont run it with the cap off you need it to
build up pressure in order to get the air out....And yes a weeping hole
will be a problem(If something can come out------something will get in
also) thus being air getting to the system.... Doc has stated many times
about using the the vented Rad cap This is the best thing in the world
for burping older engines without the bleeders.....And also is fool
proof....Just need to make sure you keep checking the coolant level
during the process..Or youll just be defeting the purpose...