1999 Chevy Silverado Leaking Coolant/Water.

AQUEMINILOVE

MEMBER
1999 CHEVROLET SILVERADO

Engine Cooling problem
1999 Chevy Silverado 6 cyl Front Wheel Drive Automatic 200K+ miles

Last week my truck was towed and now were having this issue.

There is water/coolant leaking from a hose with a rubber adapter/connector piece against the engine firewall area. It seems to me a hose should have been connected to the piece, but theres no sign of a hose anywhere. The adapter slips on and off the hose easily, therefore I assume the missing hose would have the same.

I also noted that the top hose closest to the coolant cap isnt connected to anything either, and it was running under the air filter box but it does not reach the adapter and doesnt seem like the same guage anyway.

3 Replies

CEMENT HEAD

MEMBER
38 POSTS

The hose you speak that is closest to the radiator cap is for your coolant reservoir the hose runs along the wheel well and into the bottom of reservoir. The other hose coming out on top of reservoir is yet another over flow which this hose does not connect to any thing. You may have had coolant come from that hose due to the angle the vehicle was towed. I would say your reservoir must have been full.

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Sunday, August 2nd, 2009 AT 10:17 AM

AQUEMINILOVE

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3 POSTS

What about the hose by the firewall with the black adapter end? Is something supposed to be attached to it? Because thats where it is leaking from.

Is that where the heater core or water pump connects perhaps?

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Monday, August 3rd, 2009 AT 10:10 AM

SONOBOB

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3 POSTS

If I correctly understand your description, the hose at your firewall sounds like it is one of the two heater core hoses that attach to a pair of plastic firewall bushings/couplers that step down from one diameter to another. One of these cracked on my '99 Silverado 2500 a little less than a year ago. I remember having to use an AC/fuel line disconnect tool to get the broken hose-end coupler off the firewall coupler. I can't remember the details, but will take a look at my repair and if I can get a photo of it, I'll include that when I get back to you with some more info.

Like cement head wrote, the hose at your coolant cap is an overflow that just runs along your fender well with an open-end termination.

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Monday, August 3rd, 2009 AT 6:42 PM