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Old February 14th, 2010, 11:37 AM   #1
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I have an 03 Blazer and no I have no heat. I have replaces the thermostat and have check the coolant level. I have no leaks anywhere. Any suggestions.
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Old February 14th, 2010, 11:38 AM   #2
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What temp is it running at? Blend door may not be working?
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Old February 14th, 2010, 11:44 AM   #3
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The temp is running at about 200. That's the only other thing I could think of. Would that be just replacing the temp control switch.
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Old February 14th, 2010, 11:45 AM   #4
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Heater core. I recently did mine , it is a big problem with s-series vehicles.

If you decide to tackle the heater core let me know. I can send you a really good write up on how to do it !

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Old February 14th, 2010, 11:55 AM   #5
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If it was the hearter core, wouldn't it be leaking somewhere?
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Old February 14th, 2010, 11:56 AM   #6
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Quote:
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If it was the hearter core, wouldn't it be leaking somewhere?
Mine had got plugged with nasty old dex-cool and it never leaked but I had no heat. After I replaced the heater core it was great again and the old heater core weighed a lot more than the new one from build up on the inside.
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Old February 14th, 2010, 11:57 AM   #7
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yes alot of the s-series plug the heater cores up pretty bad, you can usually get them flushed out, GM actually sells an acid to flush it out but dont leave it in to long
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Old February 14th, 2010, 11:59 AM   #8
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X2 on the Heater Core. I have a 1998 Ranger that I did the heater core in, due to no heat, and no leaks, and it had gotten plugged. I didn't notice the weight aspect of it, but didn't think about it either. Heater core jobs are fun! (sarcastic voice) good luck!


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Old February 14th, 2010, 12:15 PM   #9
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try blowing through the core with your air compressor. It can be messy But I've saw it work a time or two.
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Old February 14th, 2010, 12:20 PM   #10
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Thanks. If I have to replace the heater core I'll pay someone to do it.
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Old February 14th, 2010, 12:22 PM   #11
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Quote:
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Thanks. If I have to replace the heater core I'll pay someone to do it.
Honestly it is not that bad. Most places want a round $600-800 to do it.

Good luck hope it works out cheaper for ya.
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Old February 14th, 2010, 12:24 PM   #12
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unhook hoses and put garden hose on it a flush the crap out
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Old February 14th, 2010, 01:54 PM   #13
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Quote:
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unhook hoses and put garden hose on it a flush the crap out
I've done this many times. Always got heat back. Flush from one to the other side till the water comes out clean and flows good.
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Old February 14th, 2010, 04:40 PM   #14
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Thank you for all the help. I unhooked the lines and used the air compressor. Now I have heat. I will probaablly try the hose line this summer.
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Old February 21st, 2010, 02:44 PM   #15
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Unhook the heater hoses and run the garden hose through it both ways until clen water comes out in both directions. 99% of the time this will cure the problem on S seires trucks.
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