Antifreeze leak = intake manifold gasket

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Antifreeze leak = intake manifold gasket

Postby sjacoby » Mon Dec 03, 2012 5:36 am

My 2002 crew just started leaking coolant. It's not coming from the rad or top heater lines. When i look underneath the front of the motor is dry. The back (closer to the drivers side if the firewall is wet and te leak is dripping to the ground around the firewall as well. My oil is clear of antifreeze, i have no warning lights on and it runs well.
Any ideas where it may be coming from?
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Re: Antifreeze leak

Postby HenryJ » Mon Dec 03, 2012 5:46 am

Running Dexcool orange coolant? Intake manifold gasket leaks are a common problem.
The OEM gaskets were not compatible with Dexcool and get eaten away. The air in the system is compounding the problem by contaminating the Dexcool. Get it fixed soon. I would suggest a good flush , upgrade the gaskets and go with green coolant.

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Re: Antifreeze leak

Postby sjacoby » Mon Dec 03, 2012 5:51 am

No just coolant picked up at the local gas station. So if this is the case, how big on a job is it to change the intake manifold gasket, and what are my torque specs for the intake manifold itself? Thanks for the response
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Re: Antifreeze leak

Postby HenryJ » Mon Dec 03, 2012 11:07 am

Yikes! If you mixed Dexcool with anything other than distilled water... you are in for problems.

You will find several threads around here with step by step directions on flushing, intake gasket replacement (both upper and lower). As well as experiences and tips from those who have done the deed.
Shout if you don't find them. Feel free to bring them back to life too :)

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Re: Antifreeze leak

Postby AVTekk » Mon Dec 03, 2012 11:50 am

x2 on intake manifold gasket. only other thing back there are freeze out plugs and they dont go bad as often. Id flush the dexcool and run the regular green, but def dont mix them.
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Re: Antifreeze leak

Postby barch97 » Tue Dec 04, 2012 1:42 pm

sjacoby wrote:The back (closer to the drivers side if the firewall is wet and te leak is dripping to the ground around the firewall as well
There's a pair of hoses about 1" diameter that run back to the heater but they'd be on the passenger side. It's a long shot but may be worth taking a look before tearing into the intake manifold. You're going to need to locate these hoses to install flush T anyway.
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Re: Antifreeze leak

Postby sjacoby » Sat Dec 15, 2012 3:08 pm

turns out it was the intake manifold gasket, ended up getting a local garage to do the work as I was limited on time. Thanks for all your help!
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Re: Antifreeze leak = intake manifold gasket

Postby mars2878 » Sat Dec 15, 2012 5:28 pm

Glad u found it & all is well now.
01 Sonoma sls crew cab - 00 Camaro rims, lear cap w/additional led int light, reese hitch, 99 envoy dash outlets, 98 bravada switch plates & hvac knobs.
03 grand am se 3.4 auto sedan - 02 gt ram air induction parts, aftmkt taillights.
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Re: Antifreeze leak = intake manifold gasket

Postby PATRICKH » Fri Feb 15, 2013 2:37 pm

Mine is in the shop today, same issue. 14 hour days and auto repairs are not good friends.
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