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99 Blazer- Heat Won't Turn off/No A/C
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SnoWhitEmerald
New User
Jul 4, 2010, 4:35 PM
Post #1 of 2
(5033 views)
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99 Blazer- Heat Won't Turn off/No A/C
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I'm the driver of a 99 Chevy Blazer, just bought in January, used and as is. At the time I used heat being that it was winter and it warmed the cabin just fine. It's now 90 degrees daily and I have no AC and worst of all, there is constant heat being put out even with the controls turned off and on the lowest temp. I have to constantly refill my coolant jug after every drive; I see the fluid leaking after a stop but don't know where's it coming from (no whole in jug).
Please advise. Thank you.
Edit to add that there is a nasty, fishy odor coming from the vents as well.
(This post was edited by SnoWhitEmerald on Jul 4, 2010, 4:37 PM)
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
Jul 4, 2010, 5:50 PM
Post #2 of 2
(5023 views)
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Re: 99 Blazer- Heat Won't Turn off/No A/C
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Full size Blazer - right?
There's two things going on IMO. The loss of coolant and odor strongly suggests a leaking heater core - arggh - a no fun job.
The temp staying warm/hot could be a couple things. Blend door could be stuck to the high temp blend and a heater will beat the A/C in any vehicle if there's a stand off.
Check for antifreeze dampness on passenger's side floor and windows that have a funky, sticky fog that doesn't clean off so easily and just wiping it makes a mess. That's typical of antifreeze getting inside.
This may use a "heater control" valve and or an electric actuator for heated coolant to stop flowing thru heater core in any volume or just divert/mix air to desired temp.
You need to address the leak at once! I would join the two heater hoses to the firewall together so coolant can still flow in a loop but sealed from leaking that way. A/C then has no heater to fight with and the leak is gone for now if you do that. Good test to see if A/C is working and diverter door/blend door is operating properly as the most heat it could get is outdoor air temp plus a tad for engine heat.
Find and stop/fix the coolant leak before this becomes a host of assorted repairs. I think it's two issues for right now and worth total diagnosis first so you don't go dash diving twice over this!
T
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