there is a lable on the fan shroud at the top (at least it may still
be readable) that shows the degre setting for base timing. This is all
you check, since the computer controls the advance. I know on a 92
350 base timing is 0 . I don't know what the base timing is on a 95
If the timing advance is not working it should set a code in the
On Thu, 6 Nov 2003 09:07:01 -0500, "Robert Le Feve"
I don't think its a timing problem. If the timing is way off you'll
have performance issues and most likely you set hard codes on the ECM.
You need to do a pressure test of the cooling system. At this point I
would suspect a head gasket issue, cracked head, radiator fan clutch
I still lean towards the fan clutch..... based on what you have said.
In my view if it were a cracked head or head gasket the truck would
for sure over-heat.... as far as running warm (close to hot but not
overheating ) then I would look to something in the cooling system
On Thu, 6 Nov 2003 20:59:41 -0500, "Robert Le Feve"
What temp should a properly operating radiator fan clutch kick in?
The reason I ask is now that I have replaced everything BUT the fan clutch I
am getting a "slightly different" symptom.
The truck takes its time wharming up then the guage "parks" just to the left
of the 215 mark for about a min.
Then it starts to get wharmer, then eth electric fan comes on.
I have only herd the fan clutch kick in once since this problem started
happening, I had 6 people and all their luggage in the vehicle, it kicked in
for a few seconds and there was no temp change.
Should I stay away from aftermarket and just stick with OEM on a fan clutch?
I belive with Fan Clutchs on a car its a combination of temp and
engine rpm when the radiator fan clutch engages. I think it would be
in the temp range of 210-230F before you would "hear" the sound
of the clutch pulling air through the radiator.
As far as brands of fan clutches I would only buy a GM fan clutch and
I would get the HD version if they have one for your truck. They are
kind of expensive but worth it in the long run.
I also found that TV cable adjustment on the transmission makes a
difference on the performance of the fan clutch... How is this???
Well the TV cable adjustment allows the engine to rev higher through
the gears on the transmission before it shifts to the next gear. The
upper rpms allow the fan clutch to come on and perform like its
designed to. ON the other side of the coin, if the TV cable is
adjusted to where it allows the trans to shift to soon you don't get
into the rpms "upper range" so the radiator fan clutch does not come
on like it should. I've seen this first hand and it does make a
IF I recall, one way to check a fan clutch is to get the engine up to
operating temp............ drive it around a while............
then cut the enigne off and open the hood and see if you can turn the
radiator fan by hand easy... if you don't have much resistance then
the fan clutch is faulty. You'll need to reference the appropriate
service manual for your truck.
On Fri, 7 Nov 2003 11:06:18 -0500, "Robert Le Feve"
Guess its time to suspect the guage is not working properly???
I'm not sure what to reccomend now, since you've basically replaced
the cooling system. The sensor in the cylinder head is not hard to
replace. Not sure how you can test the accuracy of the factory temp
guage, unless you were to use an aftermarket guage with the built in
mechanical temp sensor.. I know on some ECM scan tools you can see
the temp. as the ECM sensors reads it , and compare to the dash gauge.
Can you tell that the fan clutch is working?
Time to carry truck to a local mechanic you trust.... some of these
problems can't be solved on the net. Sorry you've not been able to
fix the issue. I've been there a number of times myself.
On Tue, 11 Nov 2003 15:44:11 -0500, "Robert Le Feve"
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