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Username Post: '99 5.3 Coolant Leak        (Topic#247329)
94C1500 
Contributor
Posts: 177
94C1500
Loc: Dickson, TN
Reg: 07-09-03
08-12-10 11:01 AM - Post#1959944    

Hey guys I've got a coolant leak that requires me to add coolant every couple of days or so.

Recently I've noticed a small wet spot under my parking spot at work. I looked under the truck today and saw a little antifreeze dripping from the back of the skid plate. And yes, I know it could be coming from anywhere with such vague information.

As of now that's all the info I have but I'm hoping that some of you could list the most common areas to leak coolant on our trucks.

This weekend I'll have time to really look things over.

Thanks in advance.
13 Silverado Z71

99 Silverado Z-71 - Sold

94 Silverado Sportside

66 Chevelle 300 Deluxe

68 El Camino

74 El Camino - Gone


Edited by 94C1500 on 08-12-10 11:16 AM. Reason for edit: No reason given.

 
LMC Trucks
Bad Bowtie 
Valued Contributor
Posts: 4614
Bad Bowtie
Age: 42
Loc: TX
Reg: 07-04-03
08-12-10 12:14 PM - Post#1959993    
    In response to 94C1500

Intake manifold or heater hose nipple (5.7L Classic '99)...

GMC. We are Professional Grade.

http://www.cardomain.com/id/2004VHO


 
mwright1 
Senior Member
Posts: 684

Loc: Naperville, IL
Reg: 04-05-04
08-12-10 12:47 PM - Post#1960014    
    In response to Bad Bowtie

Water Pump?
If it ain't broke open it up and make it better 03 Silverado 5.3 Z71


 
Alan_W 
Senior Member
Posts: 510
Alan_W
Loc: Little Rock, AR
Reg: 10-15-02
08-12-10 01:23 PM - Post#1960026    
    In response to 94C1500

Water Pump Gasket. Common problem with these models. I'm surprised yours lasted this long.
Depending on miles, maybe the water pump also.
2000 GMC Sierra SLE 3Dr. X-cab
2WD/5.3/auto/3.73


 
94C1500 
Contributor
Posts: 177
94C1500
Loc: Dickson, TN
Reg: 07-09-03
08-13-10 05:52 AM - Post#1960329    
    In response to Alan_W

I have a feeling it may be the water pump. I'm going to have to get under it with a shop light to see. I still couldn't tell where it's coming from when I was crawling under the truck yesterday afternoon.

I appreciate the responses. I'll report back what I find out.
13 Silverado Z71

99 Silverado Z-71 - Sold

94 Silverado Sportside

66 Chevelle 300 Deluxe

68 El Camino

74 El Camino - Gone


 
Alan_W 
Senior Member
Posts: 510
Alan_W
Loc: Little Rock, AR
Reg: 10-15-02
08-13-10 06:25 AM - Post#1960341    
    In response to 94C1500

I got by for now on mine just replacing the gasket, but it could be time for a new water pump for either of us.

Take heart, though, it is not a very hard or long job.
2000 GMC Sierra SLE 3Dr. X-cab
2WD/5.3/auto/3.73


 
94C1500 
Contributor
Posts: 177
94C1500
Loc: Dickson, TN
Reg: 07-09-03
08-16-10 04:54 AM - Post#1961640    
    In response to Alan_W

Turns out it was indeed the pump. My handy dandy inspection mirror helped me confirm that the coolant was leaking from the weep hole on the bottom of the pump snout and running down the engine then back to the skid plate.

One thing I learned about removing the fan: I had forgotten to look for the strap-type wrench to hold the pulley while loosening the fan as the pressure of the accessory belt wasn't enough after 190,000 miles (never replaced water pump till now.)

If you fish a clothes hanger thru the un-used threaded holes of the pump pulley and tie it around the alternator bracket, it will hold the pulley just enough to loosen the fan nut.
13 Silverado Z71

99 Silverado Z-71 - Sold

94 Silverado Sportside

66 Chevelle 300 Deluxe

68 El Camino

74 El Camino - Gone


 
LMC Trucks
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