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#1
10-31-2007, 08:48 AM
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99 GM coolent leaking!!
Hello, I have a 99 and I found out where coolent was leaking from it was at the thermostat housing. So I bought a new thermostat and gasket but the gasket is just a O-ring so I took off the housing replaced the thermostat and put the o-ring in the same place the old one was which drops down on top off the thermostat. I then cleaned up the corrosion on the housing and put it back on and tightened. Started the vehicle back up and it was leaking AGAIN from the housing so I took the housing back off and cleaned. Then I put instant gasket around the housing and its still leaking!!! PLEASE HELP!!!
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#2
10-31-2007, 12:44 PM
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Re: 99 GM coolent leaking!!
You probably have a cracked intake. Remove the housing again, dry it as good as you can and spray carburetor cleaner on the outside of intake. As the cleaner dries, if there are any cracks in the plastic, it will show up as wet lines longer than the smooth places.
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Being way2old is why I need help from younger minds The sooner you fall behind the more time you'll have to catch up.  HEY Y'ALL--READ THIS Here are some of our old vehicles for sale. 
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#3
11-01-2007, 07:36 AM
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Re: 99 GM coolent leaking!!
Common problem that wound up being settled by a class action law suit.
http://www.fordmanifoldsettlement.com/
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HERS---> 2006 Grand Marquis GS (replaced my 1998 w/cracked manifold) HIS----> 2003 Dodge 1500 HEMI QC 4X4
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#4
12-01-2007, 09:18 PM
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Re: 99 GM coolent leaking!!
The cracked manifold is a VERY common problem and sounds like you have it. The lawsuit settlement was for cars 7 years old or less. I doubt your car is covered by the lawsuit settlement.
There are some very good DIY instructions here... http://www.autoclinix.com/Manifold.htm if you care to tackle the job yourself. I've done it twice (2 different cars) and it's not too bad.
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