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99 S-10 Blazer.. Heat not working!
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Krashtastic
Novice
Jan 9, 2009, 9:05 AM
Post #1 of 6
(1818 views)
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99 S-10 Blazer.. Heat not working!
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Ok, so I have the S-10 size Blazer 99, with the 4.3L Vortec.. Anyways.. My truck keeps losing my coolant. Somewhere back near the firewall I think.. Heat works great as long as I keep fluid in it, but leaks out running or not, overnight. When fluids are low, my dash gauge shows my heat up twice what it does with fluid and heat working.. Any ideas? I've already gotten a new heater core, but beings I have to remove the dash to replace it, I'd like to know if that even sounds like the problem, or what I should be checking first . Thx..James
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Jeff Norfolk
Enthusiast
Jan 9, 2009, 9:10 AM
Post #2 of 6
(1817 views)
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Re: 99 S-10 Blazer.. Heat not working!
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Pretty likely that the intake is leaking. Very common problem here. It will leak even if the car is not running and will leak in the spot you described or on the front. Fairly tough DIY job.
Jeff
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Krashtastic
Novice
Jan 9, 2009, 9:26 AM
Post #3 of 6
(1814 views)
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Re: 99 S-10 Blazer.. Heat not working!
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eww.. thats not good.. that worse than removing the dash to replace the core? and will i probably have to replace the intake or maybe a gasket problem?? it has a little over 110k miles runs great.. maybe throw a leak sealant in it till the weather warms up? lol gonna go see if i can pinpoint the leak now..grr
(This post was edited by Krashtastic on Jan 9, 2009, 9:28 AM)
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Jeff Norfolk
Enthusiast
Jan 9, 2009, 9:29 AM
Post #4 of 6
(1807 views)
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Re: 99 S-10 Blazer.. Heat not working!
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Leak sealent is a bad idea. It will cause a hole host of problems. Probably just a gasket but sometimes the intake needs to be replaced depending on the corrosion level. I have seen it both ways.
Jeff
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Krashtastic
Novice
Jan 9, 2009, 9:57 AM
Post #5 of 6
(1803 views)
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Re: 99 S-10 Blazer.. Heat not working!
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found it.. leaking like crazy around the water pump.. looks like a fun task  it sure is too!.. looks much easier than the heater core or the intake.. wheh.. that makes me feel better.. Thx..James.. sure I'll be back later lol
(This post was edited by Krashtastic on Jan 9, 2009, 10:08 AM)
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Jeff Norfolk
Enthusiast
Jan 9, 2009, 10:22 AM
Post #6 of 6
(1800 views)
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Re: 99 S-10 Blazer.. Heat not working!
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Water pump is much easier than intake. I wounder if this is the only leak? Water pump won't leak done by the firewall as your first post mentioned. Either way a water pump job is much more DIY friendly. Good Luck
Jeff
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