Question about 2006 Chevrolet Silverado

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Replaced thermostat, no leaks in heatercore, heat control working.when driving at 60 mph or faster you will get a little heat out of vents. ldbos1@netzero.net

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You are dealing with a vacuum leak. Vacuum operates the flaps that direct air through the heater core. When you are traveling at higher speeds there is enough excess vacuum to partially operate the system. Under the dash or under the hood , there is a vacuum line that is misrouted , kinked , cracked or unhooked . You will need to do a careful , methodical search of the vacuum lines to find the bad spot. I would start under the hood it is easier to knock or break a vacuum line there and not notice what has happened (changing spark plugs,changing oil , cap rotor wires, etc.). The problem could be under the dash , a pencil fell down a vent and is jamming the heater vent closed, again a cracked or unhooked vacuum line, or even a simple heater shutoff valve that is just not opening the way it should to allow the warm anti freeze to flow to the heater core. Depending on how loud the exhaust system is it may be possible to carefully listen for the leak with a tube to your ear . A tube will allow you to listen in areas that may be hard to access (under the dash). Good hunting.

Posted on Nov 14, 2010

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Little heat coming out of vents.


IF YOU CAN'T FEEL THE AIR FLOW OUT BUT YOU HEAR THE BLOWER MOTOR WORKING, BEHIND THE GLOVE BOX IS A CABIN FILTER.REPLACE FILTER
IF YOU HAVE GOOD AIR FLOW BUT NO HEAT:
1;VACUUM LEAKING TO HEATER CONTROL
2;WATER PUMP GOING BAD / NOT CIRCULATING COOLANT,HIGH RPM/MORE COOLANT TO THE HEATER CORE
3;OPEN THERMOSTAT/ENGINE TEMPERATURE TO LOW
1;CHANGE THE DIRECTION FROM VENTS TO FLOUR TO WINDSHIELD. IF NOTHING HAPPEN IS THE VACUUM
2;RUN THE ENGINE INSIDE ON WARM PLACE ON IDLE.NOTE THE GAUGE IF PAS 1/2 TO 3/4. IF PAS 3/4 MARK REPLACE WATER PUMP
3;IF GAUGE STAY BELOW 1/2 REPLACE THERMOSTAT
GOOD LUCK

Mar 27, 2014 | 2005 Dodge Neon

1 Answer

Will not heat up


do you mean you dont have heat from the blower in the car? if so does the blower motor work(is it moving air out the vents), if so it could be an air pocket in the heater core, whitch means you have a coolant leak,or someone bypassed the heatercore last summer cause heatercore leaks, or the blend door is not moving in heater housing , or the heater switch is broken or not moving the actuator at motor on blend door in heater housing.

Feb 11, 2011 | 1998 Pontiac Sunfire

2 Answers

Heater only blows worm air not hot


Check these three possibilities: One, car has a bad thermostat. Two: Car has a bad heater control valve and three: Car has a vac leak under the dash that controls the heater Flap Valve. If this flapper isn't closed completely, cool outside air mixes with the warm inside (recirculating) air and cause a lukewarm air mixture at the vents.

Oct 24, 2010 | 2002 Ford Taurus

1 Answer

Heater on my 05 Grand Caravan blows cold air when below 30 degrees - above 30 works fine. Heat gauge shows normal so it shouldn't be thermostat. Checked coolant and it is fine.


just because the gauge seems normal doesnt mean the thermostat is good, its 5 years old,and may be opening to soon, i would start by having the t-stat replaced and while thats being done have the cooling system flushed including a flush off the heatercore. i ve worked on a couple of these vans with heating problems, most were low on coolant due to a slow waterpup leak, the others with half plugged heatercores, due to the lack of coolant flushes. hope this helps.

Feb 25, 2010 | 2005 Dodge Grand Caravan

3 Answers

Hello I'm having heat problemes. so far i flussed the system, still having no heat, Changed radiator and heatercor,Changed thermostat,Changed heat sensor,Now pleanty of heat acording to gage but still cold...


did you check the vacuum source of all heater controls inside the dash? maybe the actuating door valve has a leak due to an air line. also the selector mode switch could be bad

Feb 07, 2010 | 1995 Ford Windstar

1 Answer

Hello my repair problem on 89 lincoln town car is what... I HAVE REPLACED THE HEATER CONTROL VALVE, TEMPERATURE GAUGE, THERMOSTAT, REPLACED WITH STRAIGHT ANTIFREEZE, AND NO LINK FROM HEATERCORE AND THE...


Never use straight antifreeze water is needed to give it its cooling properties at most the ratio should be 60/40 antifreeze / water. It sounds like a bad check valve locate and replace.

Jan 13, 2010 | 1989 Lincoln Town Car

1 Answer

1999 Dodge durango heating sucks and leaking coolant now


Smelling antifreeze indicates to me you have a crack in the heater core. Most are made of plastic. This shows yours is metal. I guessed on 2WD or 4WD and size of engine.

http://www.autozone.com/cooling-heating-and-climate-control/heater-core/spectra-premium-heater-core/979573_717836_0

Unlikely to be frost plugs unless you ran the system without antifreeze and the block partially froze. When they freeze fully, the plug pops and out and you lose all the coolant when it thaws.

Finally, this is a common problem with the Durango! As my learned colleague says, replace the thermostat as it needs to be fully open to let water flow well to the heater core.

1999 Durango Google Search

Mar 28, 2017 | 2001 Dodge Durango

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