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The heat does does not work in my 98 Tahoe at all its blows cold all the time I have done changed the there and put new coolent in it still have no heat so I by pasted the heat valve and ran it right in and still have no heat what eles can I do now

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  • 48 Answers

If you are getting hot water/coolant to the heater core and still no hot air coming out the vents, then it's a issue with the climate control or blend door. After running your engine and it reaching normal operating temp, locate your heater hoses that goes to the heater core. Carefully touch them to make sure both hoses are hot to the touch, if they are, you are getting hot water/coolant to and from the heater core. So, then it will have to be a issue with the climate control in the dash or either the blend door in the air box. It's a common problem for the climate control to go out on these models, hope this helps.

Posted on Nov 26, 2013

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Posted on Jan 02, 2017

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samson-1
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SOURCE: 98 jeep wrangler no heat

Try this disconnect the heater hoses from the heater core use a hose to backflush the core. Then reconnect and try again.

Posted on Oct 18, 2008

  • 512 Answers

SOURCE: cold air comming out of right side duel control when heat is on

the blend doors have broken...you will need to remove the heater/ac box to replace them

Posted on Nov 13, 2008

emissionwiz
  • 76848 Answers

SOURCE: 2005 Chevy Tahoe

THE PROBLEM IS NOT A FUSE, IT IS THE REAR SEAT AIR TEMPERATURE CONTROL BLEND DOOR THAT IS CAUSING THE PROBLEM.

Posted on Nov 23, 2008

chuck943
  • 783 Answers

SOURCE: Heat blows cold when car is idling

You have an air pocket in the cooling system. To bled it out you will have to park vehicle on an incline or jack up the front end untill the radiator cap is higher than the heater core. The remove radiator cap and run engine until warm then hold rpm to about 1200 rpm's and top off coolant level until you have no more bubbles.

Posted on Feb 02, 2009

  • 784 Answers

SOURCE: my heat not workini but blow cold air where is

Has the car been changed coolant since it was bought? If it is time to change, let do a flush through a heater core. There are 2 coolant hoses going thru a fire wall. One for coolant in and one for coolant out. Heater only works if coolant is flowing through the heater core. Therefore, there are one or both following cases contributes to the problem: 1-If the valve control coolant flow gets stuck, then it always closes  so there is no heat. 2-If the valve is working, but the heater core gets clogged up, then there is no heat.

Posted on Oct 11, 2009

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