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Tahoe & Suburban The power, space, and brutal towing ability make the Tahoe and its longer sibling, the Suburban, arguably the best full size SUV's on the market today.

2013 Chevrolet Suburban
Platform: GMT 400, 800, 900

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Old 10-26-2011, 08:33 AM
CF Beginner
Join Date: Oct 2011
Posts: 2
Default 1999 tahoe has no heat

hi, having a hard time posting, jumped in to ask a question, my 99 has no warm air, blows but no heat., i don't hear any air flow change or noise when i switch to heat nor do i feel heat coming from the rear, any one know where to start looking?
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Old 10-26-2011, 07:45 PM
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Join Date: Apr 2006
Location: KC, MO area
Posts: 8,526

Welcome to the forum.

Moved to a new thread to get more views.

Don't know if '99s had a heater water control valve but if it does start there. Does the truck heat up to normal operating temp? If not, check thermostat. If it does, then are both heater hoses (in & out) getting warm?
2010 Sheer Silver Tahoe LTZ (all options but sunroof, power boards), GM (body color flaps, rear console, 3rd row mat, 2-Way Remote, chrome gas door, Esky rack), Eagle Eye LED tails, SLP dual tip exhaust, Silver bow-ties/rear wiper, Catch-All mats, AlphaTherm washer fluid heater, Putco chrome mirror covers, silver calipers, board chrome trim, tint, GMPP Major Guard

2007 Black Tahoe LTZ (Sold),
(GM flaps-$15, Lund Step Tubes-$80-For Sale)
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Old 10-26-2011, 08:45 PM
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Join Date: Nov 2008
Location: Bowie, MD
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Is the coolant full?
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Old 10-27-2011, 11:51 AM
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Join Date: Oct 2011
Posts: 2
Default thank you

it is,,i bought a book,,im coming back if i cant figure it out,,thanks
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Old 10-27-2011, 01:24 PM
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Join Date: Jul 2011
Posts: 2,654
not anymore Kevin Koloff

What was asked about the hoses checks the thermostat. After it is warmed up or should be, is the top radiator hose hot, and flowing, you can tell by pinching the hose. Also, with heat selected, does air blow out the bottom, and also defrost to the windshield when defrost selected?
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Old 11-09-2011, 08:39 PM
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Join Date: Nov 2011
Posts: 1

Sorry to thread jack, but this is the same issue I am having with a 2001 Sub. Both heater hoses are hot, and the rear unit puts out hot air. The engine warms up to 195 just like it has for the past 10 years. I can hear something moving behind the dash when the temp selector is moved to "hot", but the air coming out of the lower vents and defroster is not warm. It does seem to be reduced flow compared to the "cool" setting. I believe that perhaps there is a selector vent door that is not moving or is blocked.

I searched these forums and elsewhere for a nice expanded (parts diagram) view of the heater unit, but the only one I have found is a pretty lame picture. (No part numbers and it was barely legible. Obviously not a factory diagram.) Is this job going to require me having the freon removed and then pulling the entire dash just to access the heater unit? Anyone have a better link for good parts diagrams? The one in the sticky is permanently closed.

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Old 11-10-2011, 06:27 AM
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Join Date: Feb 2011
Location: Middletown DE
Posts: 345

I'm going to replace the doors in mine since all the weather stripping is gone off of them and i get hot and cold air but the volume seems less then my freinds 98 hoe i tried to attach them but there to big ill try in a PM

97 4x4 burb
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Old 11-10-2011, 06:27 AM

1999, 1999tahoenoheat, 99, chevy, gmc, heat, heater, hot, intermittent, normal, running, suburban, tahoe, temp, wont

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