Question about 1999 Chevrolet Silverado 2500

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Heater takes a long time to heat up

One heater hose gets hot pretty quick and the other takes a long time. So I unhooked one heater hose and used air to check flow both directions and was clear. After you drive it 4or5 miles it will start blowing hot air. Engine temp is 200.

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  • Chevrolet Master
  • 14,379 Answers

Replace the thermostat,stuck open.

Posted on Dec 12, 2012


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Posted on Jan 02, 2017

Tech jk
  • 102 Answers

SOURCE: my heater stoped blowing hot air.antifreeze level

If the blower is blowing air just fine, but you cannot control the temperature, you need to listen to air coming from the vents while turning the temperature from hot to cold. If you do n ot hear any change in airflow, then you may a temperature door in the dash broken. this is becoming a common problem on the Equinox and Pontiac Torrent,

Tech JK

Posted on Oct 15, 2009

  • 14 Answers


could be vaccum leak in the a/c panel where the flappers open and close to allow hot and cold air to blow

Posted on Jan 03, 2009

  • 366 Answers

SOURCE: 2004 Tahoe Heater Problem

check coolant level ,must be low ,chck for coolant loss

Posted on Mar 05, 2009

  • 1586 Answers

SOURCE: 2004 Chevy Impala no heat. Fan OK. Engine warms

Your heater core is clogged. You can fix it. Disconnect the two heater hoses and put one into a bucket. Use an air compressor to blow into the other - it'll flush the contents into the bucket. Then reverse it - put the hose you blew into, in the bucket, and blow into the one that was in the bucket. This way, whichever side of the core had the clog, you can blow it out. Reconnect the heater hoses, and then burp the system or you can end up with air bubbles in the cooling system that can cause you to overheat. Click my screenname, go to Tips and Tricks, and follow the procedure there - it'll walk you through the whole procedure step by step.

Posted on Dec 23, 2009

  • 147 Answers

SOURCE: 2008 Chevy Uplander has 21,000 miles. Nno heat

Uplanders with the 3.9 engine are prone to no heat at idle speeds. Probably weeping head gasket. Air bubble trapped. Dealers will remove rad cap and let it sit at about 25 deg. angle for a couple hours. Good for awhile.

Posted on Nov 23, 2010

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Why wont the heater blow hot air, the core doesnt look clogged?


Thanks for using FixYa. Try and check if the heater core is plugged. Find the 2 coolant lines going to the heater core. They are right next to each other with approx 3/4" hoses going to the engine. Now, warm up the engine with the heater on max (don’t turn on the fan). Next, feel if the hoses are warm (maybe HOT!) If they are not warm, then you most likely have a plugged core. A back flush will resolve the issue. If your hoses are warm, turn on the fan. One hose should go cold (or cooler than the other, actually should be about the same temp as the air from your air vents, if there is a plug). If both hoses are hot and stay hot, and you have no heat, then the problem is not with the heater core but with the blend doors.

There are electric motors that operate the "blend doors" inside the dash directing air flow from the heater core and A/C evaporator core to the cab of the vehicle. If you feel a drastic difference in one of the radiator hoses, then try replacing the thermostat and see what happens. If all the heater and radiator hoses are pretty much the same temperature I would suspect a control problem in the dash controls or in the blend door operation. You’ll need to remove the dash to check these.

Please do accept the solution if the issue is resolved or else revert for further assistance.



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