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post #1 of (permalink) Old 10-18-2004, 04:13 PM Thread Starter
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1999 S-10 Blazer Heater

I have a 1999 S-10 Blazer with the 4.3 v6 and automatic trans that has a heater problem (it doesn't heat) every fall. For the last three years, each fall, the heater has not worked until I change the thermostat. It has recently turned chilly and right on schedule, the heater doesn't work! Is this a common problem? If so, is there a more permanent fix than changing the thermostat?


James Hiers is offline  
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post #2 of (permalink) Old 10-19-2004, 03:22 PM
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Re: 1999 S-10 Blazer Heater

I am wondering if this is a common problem also. I just bought a 1999 Envoy,, and it doesn't heat either. Luckily it was under the GM Certified warranty, so I am currently getting it fixed.
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post #3 of (permalink) Old 07-16-2006, 12:34 PM
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Re: 1999 S-10 Blazer Heater

the thermostat mainly controls the coolant flow throughout the engine. changing it is good, but will not solve the problem about no heat. the most common problems these trucks have, (i have a 1994 chevy s10 4x4 pickup), is the heater core gets clogged with debris, dirt, and other muck in the coolant. you should be lucky to only not have heat. my s10's heater core went bad in the winter of 04/05, and i was stuck with two little ceramic heaters mounted on the dash. the problem i had with mine was the heater core was cracked, and weas leaking coolant all over the inside of the passenger's carpet area. replacing the heater core is not too hard, you just have to take out the dash board, remembering where to put all the bolts you took out (markers help to color code the bolts and bolt holes), and taking the heater hoses off from under the hood. good luck

-Big Daddy
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post #4 of (permalink) Old 07-17-2006, 03:16 PM
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Re: 1999 S-10 Blazer Heater

I have a 99 as well. My truck doesn't have any problems as of yeet as far as heating. However I have had an issue with coolant loss. I have checked the floorboards anf haven't found any there. I just recently put almost 3/4 of a gallon in and haven't had it lose any of it. I use the Prestone orange that is supposedly DexCool compliant. Under the hood of my truck has always seemed to get very hot but my temp guage doesn't say that it is hot. I think that the temperature sending unit is good.
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