Question about 1996 Chevrolet Tahoe

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Hello I have a 96 chevy tahoe I replaced the heater core the thermostat & flushed the system I had heat when I finished but the next morning it was only blowing cold air could this be the water pump?

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Chuck, having done this last year on my 99' Tahoe I will tell you to check to be sure you have filled the system and purged all the air out of it. Be sure to open the heater wide open (all the way into the red area) to make sure the heater valve is letting water into the heater core..You can park the truck with the nose higher than the rear and that will help purge the system of air also. Sometimes it take a while to get the system completely full of coolant.

Posted on Nov 18, 2014

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No the pump was working when you ran it after the job. It is more likely that when you shut it down the heat in the block produced a hot spot in the cooling system that produced an air lock. Try bleeding the cooling system ( radiator shop will help) and recheck the coolant level at the radiator cap..

Posted on Nov 18, 2014

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Posted on Jan 02, 2017

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SOURCE: heater blows cold air have replaced the thermostat

sounds like the controller went bad use temp checker see what your temp is at inlet of heater core from hose

Posted on Sep 08, 2009

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SOURCE: 1999 Ford Taurus, no heat.

Try checking the two pipes that go into and come out of the heater matrix, is one of them hot? if it is there is an air lock within the matrix, Also is the thermostat opening fully? Sorry i know you said you have changed it twice already but take it out check settings when it should open and close, then boil some water and test the thermostat

Posted on Dec 30, 2009

Boole5555
  • 160 Answers

SOURCE: I have a 1997 Saturn SL2. I have no heat. We

It is your heater core, there is nothing else left.

The heater housing is usually under the dash, and it must be removed to gain access to the heater core.Procedures for removing a dash, and heater core vary. But for the core:
The heater housing must be removed, and then you
"remove the panels" or "split the case"1c3d50c.gif (Usually screwed together.)
Remove the coolant hoses, the cable and vacuum control line.
Remove the heater core bracket and clamps.
To install the new heater core, reverse the removal steps.
Core leaks **** because of the core's location deep within the firewall/ dashboard of the car.
So remember to liquid test your new one before you put it back in, or you could be sorry.

Posted on Jan 07, 2010

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SOURCE: heater blows cold air. I have replaced thermostat,

Not an expert by any means, but i know my ranger.. I had a small leak at the top of my radiator that still cooled the engine but didnt have enough pressure to get to the heater. The heater hoses travel up over the engine and just were not gettin anything to my heater core. That or make sure the heater control valve is operating.

Posted on Apr 16, 2010

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I have no heat in my 2002 Tahoe. Could it be the Thermostat or the Heater Core? I really can't afford to take it to a dealership or a mechanic right now. Would like to do the work myself


When your driving down the road what does your temp gauge read? If it is in the normal place, about the middle, than the thermostat is working. The next thing to check is the coolant level. Make sure the overflow and the radiator are full. If the radiator gets low enough the first thing to stop working is the heat. If both of those are full than feel the hoses going to the heater core. They should both feel hot with the engine fully warmed up. If one is cold and one is hot than the heater core is plugged. Back flushing the heater may bring it back to life. Check those out first. Let me know if you have any questions and I'll do my best to answer them. Thank you for using FixYa.com!

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No heat , replaced radiator , water pump, rad. cap , hoses and flushed system twice.blows cool air.whats left?


Thermostat.? if you haven't? Do it first then try it. While the car is running for a while touch the heater hoses that lead to the firewall. if one is cold and one is hot? You have a blocked Heater core. Follow the hoses back to the engine. Unconnect them both. By using a garden hose flush out the heater core do one side and then reverse by doing the other hose Lots of junk will come out so be care ful. Mistake people make is "Flushing the system" That doesn't mean your flushing the heater core.
Seeing that you have done everything else it could be the thermostat which you didn't list or the heater core being clogged. When you finished installing the thermostat and flushing the heater core out. Replenish the coolant system . If you have a bleeder on the thermostat housing? use it . loosen it and top off the fluid until you see fluid comeout of the bleeder. The system being air bound would cause no heat..

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try flushing cooling system could be a blocked heater core.if flushing doesnt work remove and replace heatercore.

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Well sound slike you have covered most the things . I would try and remove the hoses from the heater core and back flush then with a garden hose sounds like the heater core might be pluged. Does it heat up more if you bring up the rpm's ?

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