Couple Questions.... 1991 4.3L auto

roadxing · 08-19-2008, 04:57 PM

It running hot, its reading at about 230 degrees? (has a 196? (its one ninty something anyway) degree t-stat is in it) Seems too hot for me, any guesses why? Anything common on these trucks that make them run hot?

Also how do you put gear oil in the rear diff.? Everyother car/truck ive worked on there's a plug in an obvious spot. Maybe i just overlooked it, but my differential is leaking and id like to fill it back up before it goes bad.

thanks

some-beach! · 08-19-2008, 05:10 PM

Bad fan clutch?

There's a fill hole there, look again [remove any crud if necessary].

roadxing · 08-19-2008, 06:17 PM

yeah, wow that fill hole was pretty much right in front of my face and i over looked it. woops...

how can i tell if my fan clutch is bad?

some-beach! · 08-19-2008, 08:02 PM

The first signs that a viscous fan clutch is failing are the obvious: Noise at the fan indicating a failure or the engine starts running hotter and a/c performance drops. A simple test is to spin the fan as hard as you can on an engine that has not been started that day. If the fan rotates more than 1.5-3 times or with little resistance, you can bet the clutch is bad. You should feel some resistance and the fan may spin up to three times, depending on the ambient temperature/if the vehicle has been running recently. This is not a sure fire way but it is the safest and a good indicator.

jtcfanof3 · 08-20-2008, 10:58 AM

I know its a newb question from me,but where abouts is the fill hole in the rear.
I have looked everyfreaking where!My pinion seal is leaking and have not had time to change it out yet,but when I do,Im gonna need to refill.
SO a pic or an exact loaction would be awesome guy,save me some time!

some-beach! · 08-20-2008, 11:20 AM

If you're looking at the rear pumpkin from the yoke side it's on the left side. It's a recessed allen head threaded plug 1/2 way up & in between the ribs on the housing.

As the great Gallagher once said "any asshole can see it, can you?"

roadxing · 08-20-2008, 02:10 PM

i can barely get it to spin 1/2 a turn let alone 3 times around. anyhow, since im running at 230', im probably going to try a lower temp t-stat. should i get a 160 or 180?
i'd like to have it running as close to the normal operating temperature as possible

phantom_mia · 08-20-2008, 07:04 PM

a 180 your engine (providing the radiator is good) will run about 190 and not send the fi system into a frissy thinking the motor isnt warm yet causing your mpg to take a crap

also check your hoses to make sure on of them hasnt become clogged due to the lining getting old, heater hoses also

sledge-o-matic!!!

jtcfanof3 · 08-20-2008, 09:55 PM

Yep,sometimes the heater core can become clogged.

08-19-2008, 04:57 PM	#1
roadxing Registered User Age: 19 Join Date: Jun 2008 Posts: 10 Location: User is: OffLine	Couple Questions.... 1991 4.3L auto It running hot, its reading at about 230 degrees? (has a 196? (its one ninty something anyway) degree t-stat is in it) Seems too hot for me, any guesses why? Anything common on these trucks that make them run hot? Also how do you put gear oil in the rear diff.? Everyother car/truck ive worked on there's a plug in an obvious spot. Maybe i just overlooked it, but my differential is leaking and id like to fill it back up before it goes bad. thanks
	[Reply w/Quote]

08-19-2008, 05:10 PM	#2
some-beach! Registered User Join Date: Jul 2008 Posts: 70 Location: User is: OffLine	Re: Couple Questions.... 1991 4.3L auto Bad fan clutch? There's a fill hole there, look again [remove any crud if necessary].
	[Reply w/Quote]

08-19-2008, 06:17 PM	#3
roadxing Registered User Age: 19 Join Date: Jun 2008 Posts: 10 Location: User is: OffLine	Re: Couple Questions.... 1991 4.3L auto yeah, wow that fill hole was pretty much right in front of my face and i over looked it. woops... how can i tell if my fan clutch is bad?
	[Reply w/Quote]

08-19-2008, 08:02 PM	#4
some-beach! Registered User Join Date: Jul 2008 Posts: 70 Location: User is: OffLine	Re: Couple Questions.... 1991 4.3L auto The first signs that a viscous fan clutch is failing are the obvious: Noise at the fan indicating a failure or the engine starts running hotter and a/c performance drops. A simple test is to spin the fan as hard as you can on an engine that has not been started that day. If the fan rotates more than 1.5-3 times or with little resistance, you can bet the clutch is bad. You should feel some resistance and the fan may spin up to three times, depending on the ambient temperature/if the vehicle has been running recently. This is not a sure fire way but it is the safest and a good indicator.
	[Reply w/Quote]

08-20-2008, 10:58 AM	#5
jtcfanof3 Fan of the S-10 Age: 32 Join Date: Aug 2005 Posts: 2,529 Location: Sullivan Illinois User is: OffLine	Re: Couple Questions.... 1991 4.3L auto I know its a newb question from me,but where abouts is the fill hole in the rear. I have looked everyfreaking where!My pinion seal is leaking and have not had time to change it out yet,but when I do,Im gonna need to refill. SO a pic or an exact loaction would be awesome guy,save me some time!
	[Reply w/Quote]


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08-20-2008, 11:20 AM	#6
some-beach! Registered User Join Date: Jul 2008 Posts: 70 Location: User is: OffLine	Re: Couple Questions.... 1991 4.3L auto If you're looking at the rear pumpkin from the yoke side it's on the left side. It's a recessed allen head threaded plug 1/2 way up & in between the ribs on the housing. As the great Gallagher once said "any asshole can see it, can you?" Last edited by some-beach! : 08-20-2008 at 11:22 AM.
	[Reply w/Quote]

08-20-2008, 02:10 PM	#7
roadxing Registered User Age: 19 Join Date: Jun 2008 Posts: 10 Location: User is: OffLine	Re: Couple Questions.... 1991 4.3L auto i can barely get it to spin 1/2 a turn let alone 3 times around. anyhow, since im running at 230', im probably going to try a lower temp t-stat. should i get a 160 or 180? i'd like to have it running as close to the normal operating temperature as possible
	[Reply w/Quote]

08-20-2008, 07:04 PM	#8
phantom_mia Registered User Join Date: Nov 2007 Posts: 566 Location: treasure coast User is: Online	Re: Couple Questions.... 1991 4.3L auto a 180 your engine (providing the radiator is good) will run about 190 and not send the fi system into a frissy thinking the motor isnt warm yet causing your mpg to take a crap also check your hoses to make sure on of them hasnt become clogged due to the lining getting old, heater hoses also sledge-o-matic!!!
	[Reply w/Quote]

08-20-2008, 09:55 PM	#9
jtcfanof3 Fan of the S-10 Age: 32 Join Date: Aug 2005 Posts: 2,529 Location: Sullivan Illinois User is: OffLine	Re: Couple Questions.... 1991 4.3L auto Yep,sometimes the heater core can become clogged.
	[Reply w/Quote]

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