LT1 Based Engine Tech 1993-1997 LT1/LT4 Engine Related

Heater blowing cold?

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Old Jan 18, 2003 | 03:31 PM
  #1  
vodoo-chile's Avatar
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From: Del Valle, Tx, U.S.A
Question Heater blowing cold?

I recently had some work done on my car (cam, heads, TB and bypass) and since then, my heater blows cold. I have a 160* and programming for it and before this work it wasn't exactly hot but would at least defrost the windshield. Now, it just blows cold. The car does not overheat and sits a little below the first quarter mark on the guage. Any ideas? Thanks,

Kyle
Old Jan 18, 2003 | 03:53 PM
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if you got somebody else to do the work on your car, its possible that they could have screwed somthing up. the mods shouldnt have anything to do with it i wouldnt think. when i say "screwed somthing up", i mean they possibly could have switched some hoses or not put somthing back right???

if it were me, id check the heater core, id be inclined to think it was that more than anything. they can go at any time. maybe just a coincidence that it happend right after your mods. if it is the heater core, quick fix should be able to pick one u at local parts store for under 30 bucks.



jon
Old Jan 18, 2003 | 04:04 PM
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It's not using any wtaer and the passanger floor board is dry. Would the TB bypass have anything to do with it? I had to pull out the credit card to clean the frost off the window this morning. It sucked.

Kyle
Old Jan 18, 2003 | 04:07 PM
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I would just flush the heater core. Gunk can build up in them when the system is open and exposed to air.
Old Jan 18, 2003 | 04:09 PM
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Where is the heater core located in our car. Is it in the typical firewall passanger side? Haven't doen one on these cars before.

Kyle
Old Jan 18, 2003 | 04:21 PM
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Try this for some reference.
Old Jan 18, 2003 | 04:50 PM
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Mine is doing the same thing. If you don't mind I'd like for you to do something for me. With your car running, open the bleeder screw on the hose that goes to your heater hoses. (this is the one that sits up high) See if any coolant comes out. I can take the bleeder out of mine, and there is NO coolant going through the hose. No water in the core = no heat. I don't know why there is no coolant going in there. Maybe one of these guys can help. Thanks, jason
Old Jan 18, 2003 | 05:19 PM
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I will try that. Thanks,

Kyle
Old Jan 18, 2003 | 05:25 PM
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Run your car and get it up to temperature.

In the engine bay, on the passenger side, there are two hoses going to the firewall. Feel both of them to see if they are 'warm' or 'hot.' If they're both not hot, your heater core is clogged and needs to be either replaced or flushed.
Old Jan 27, 2003 | 06:48 AM
  #10  
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From: Wichita Falls,Texas
Originally posted by COMNBYU
if you got somebody else to do the work on your car, its possible that they could have screwed somthing up. the mods shouldnt have anything to do with it i wouldnt think. when i say "screwed somthing up", i mean they possibly could have switched some hoses or not put somthing back right??
jon
I don't think the heater core has any thing to do with swapping heads and cam? Except for the lines. I didn't mess any thing up regarding to the heater system. It was not even touched except the lines were removed to drain the coolant out of the radiatior. I have done it a few more times than you my friend.

Kyle when the coolant was first drained it was dark green with a orange sludge in it. It looks like it needed to be flushed. Well anyways hope you got the problem fixed.

Joe
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