Coolant Leak between Valve cover and Intake - S-10 Forum
 
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post #1 of 16 Old 10-03-2015, 04:33 PM Thread Starter
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Coolant Leak between Valve cover and Intake

I noticed coolant between the pass. side valve cover and the intake manifold yesterday and soaked it up with paper towels. I drove her 70 miles this morning and its back.

I was thinking intake manifold gasket but doesn't the coolant usually mix with the oil? I drive at least 150 miles a week, check the oil every week, and it looks great.

What do you guys think. This is my daily so I'd really appreciate the help. Thanks.







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post #2 of 16 Old 10-03-2015, 05:30 PM
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Re: Coolant Leak between Valve cover and Intake

First thing to do is clean the area off...but...it looks like its leaking from the radiator hose or thermostat housing.

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post #3 of 16 Old 10-03-2015, 05:37 PM Thread Starter
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Re: Coolant Leak between Valve cover and Intake

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Originally Posted by Rhotpursuit View Post
First thing to do is clean the area off...but...it looks like its leaking from the radiator hose or thermostat housing.

Changed the thermostat with a new gasket a couple weeks ago but I'll check it out and the hose.

Thanks.
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post #4 of 16 Old 10-03-2015, 05:47 PM Thread Starter
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Re: Coolant Leak between Valve cover and Intake

Now that I took a closer look it does look like theirs a mark going down the manifold from the housing like it was wet before. Will putting gasket sealer around the housing then bolting it down do the trick?
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post #5 of 16 Old 10-03-2015, 06:13 PM
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Re: Coolant Leak between Valve cover and Intake

What kind of gasket did yu use? I've never had to use sealer. You might check the housing and the manifold to make sure they are straight. If you must use sealer, get The Right Stuff by Perma-Tex.

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post #6 of 16 Old 10-03-2015, 07:02 PM
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Re: Coolant Leak between Valve cover and Intake

The thermostats in my 87 and 92 use a rubber ring seal around the outside of the thermostat. Those do not come with the stat and have to be bought separetly. O'reilies has them separate.

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post #7 of 16 Old 10-03-2015, 08:15 PM Thread Starter
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Re: Coolant Leak between Valve cover and Intake

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Originally Posted by bonestock View Post
The thermostats in my 87 and 92 use a rubber ring seal around the outside of the thermostat. Those do not come with the stat and have to be bought separetly. O'reilies has them separate.

Bonestock
Hmmm. When I got the thermostat, from oriellys, it came with that rubber ring. Think I'm gonna try the permatex. It's a tiny leak so it should get the job done.
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post #8 of 16 Old 10-03-2015, 08:17 PM Thread Starter
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Re: Coolant Leak between Valve cover and Intake

Cant believe I was thinking it was an intake manifold gasket. I need to take it slower next time and thoroughly examine.
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post #9 of 16 Old 10-03-2015, 08:29 PM
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Re: Coolant Leak between Valve cover and Intake

It's an S10...hope for the best...expect the worst...lol

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post #10 of 16 Old 10-04-2015, 08:37 AM
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Re: Coolant Leak between Valve cover and Intake

The 2nd pic looks like a crack to me although it looks like the leak is still coming from the thermostat housing.

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post #11 of 16 Old 10-04-2015, 08:55 AM
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Re: Coolant Leak between Valve cover and Intake

Looks more like irt and grime to me.

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post #12 of 16 Old 10-05-2015, 08:27 AM
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Re: Coolant Leak between Valve cover and Intake

Suggestion:
I bought a tstat housing gasket (Felpro) and installed the O ring.
No more leaky.

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2) '85 S10, 3.4, 700R4 4x4 stretch cab (Redneck)
3) '90 S10 2.5, 5 speed shorty
4) '91 S10, Built 3.4, 5 speed shorty (Voodoo)
5) '92 S10, 2.5, 5 speed shorty, (Barbie)
6) '92 S10, 2.5 5 speed, Shorty
7) 1979 LUV, Buick 3.8 V6, TH 350 Shorty.
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post #13 of 16 Old 10-05-2015, 04:43 PM Thread Starter
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Re: Coolant Leak between Valve cover and Intake

I just ended up tightening the clamp on the hose real good with a 5/16 and rachet. Took it for 60 miles, checked, not a single drop. I think I'm going to start using the 5/16 instead of the flathead for these clamps
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post #14 of 16 Old 10-05-2015, 04:56 PM
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Re: Coolant Leak between Valve cover and Intake

Good plan...lol

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post #15 of 16 Old 10-06-2015, 08:37 AM
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Re: Coolant Leak between Valve cover and Intake

BTW... ^^^ nice throttle return spring. Any pressure on the pedal??

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2) '85 S10, 3.4, 700R4 4x4 stretch cab (Redneck)
3) '90 S10 2.5, 5 speed shorty
4) '91 S10, Built 3.4, 5 speed shorty (Voodoo)
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6) '92 S10, 2.5 5 speed, Shorty
7) 1979 LUV, Buick 3.8 V6, TH 350 Shorty.
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post #16 of 16 Old 10-06-2015, 08:06 PM Thread Starter
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Re: Coolant Leak between Valve cover and Intake

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BTW... ^^^ nice throttle return spring. Any pressure on the pedal??
Lol It was like that when I got it but feels fine to me
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