Question about 2002 GMC Sierra C/K1500

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2002 sierra v6 heater won''t get warm. fuses all good. water not leaking from core. I circulated water thru core via hoses under hood. now what?

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Replace your A/C Actuator. most common problem is that the heater vents get stuck in the closed position blocking the heat from entering the vents. I just replaced mine in my truck and it works like a champ now.

Posted on Mar 04, 2011

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Posted on Jan 02, 2017

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1 Answer

Why is my heater blowing cold


Most likely it is the heater control valve that shifts air from blowing across your heater core to your air conditioner core.

If your fan works and your car is fairly new..meaning your heater core isn't dirty and full of craap...then it is the climate cotrol valve.
If you are lucky, it might be a thermostat that is bad and blocking hot water from entering your heater core. Bottom line, if hot water doesn't circulate thru that little heater core, you won't get heat.
You might be able to look under the hood and grab the hot water lines that go thru the firewall and feed your heater core. If they feel cold to the touch after engine has warmed up, then you aren't getting circulating water to the heater core. If they feel nice and warm, then the heater core is fine, but your climate control valve has closed off the fan that blows across the core to disperse heat into the cabin

Feb 24, 2015 | Cars & Trucks

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WATER DOES NOT CIRCULATE THRU HEATER CORE ON 2005 GMC SIERRA


It sounds like the bypass valve is stuck open. Check bypass valve and vacuum hoses attached to it.
Hope this helps.
Bob

Jan 06, 2015 | 2005 GMC Sierra

1 Answer

On a 1997 f150 with 4.6 engine I cannot get heat.. It seems as if water is not circulating thru the heater core as I can feel the two hoses going to the core and one is hot and the other is cool. I have...


There should be a valve on the heater hoses leading to the heater core in the engine compartment or under the dash that would allow hot water to the heater core check this valve before changing out any more parts.

Mar 29, 2010 | 1997 Ford F150 Regular Cab

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Defroster fogging up window


Your heater core has a leak in it and needs replaced.
Do it now before all your coolant ends up inside the truck.

Jan 30, 2010 | 1998 Ford Explorer

1 Answer

Heater blows luke warm air in dodge diesel and can hear water flowing in heater core when started. I changed the thermostat and covered the radiator and my motor only runs at 160 degrees


if u can try and take a the heater core hoses off under the hood and take a water hose and run water thru the heater core on both ends the in and out cause there could be junk in there causing it not to flow properly

Dec 12, 2009 | Dodge Ram 2500 Cars & Trucks

1 Answer

No heat is there a fuse 2003 f250 is there a fuse for heater


i don't know realy if there is a fuse (though i doubt it) but issues with heatting may be this will help.

If the carpet under the heater core is damp, or if antifreeze vapor or steam is coming through the vents, the heater core is leaking.
Remove it and install a new unit (most radiator shops will not repair a leaking heater core.
If the air coming out of the heater vents isn't hot, the problem could stem from any of the following causes:
  • The thermostat is stuck open, previnting the engine coolant from warming enough to carry heat to the heater core. Replace the thermostat.
  • There is a blockage in the system, Preventing the flow of coolant through heater core. Feel both heater hoses the firewall. They should be hot.if one of them is cold, there is an obstruction in one of the hoses or in the heater core,or the heater control valve is shut. Detach the hoses and back flush the heater core with a water hose. If the heater core is clear but circulation is impeded, remove the two hoses and flush them out with a water hose.
  • If flushing fails to remove the blockage from the heater core, the coremust replaced.

Nov 27, 2009 | 2003 Ford F250 Super Duty Crew Cab

2 Answers

Replaced the heater core. now i cant get good heat


the heater control valve is likely crusted shut ...replace that and any hoses that where crimped for a long time to heater core and backflush system with heater open full...also be sure head units cables vacuum lines and electrical were not disturbed when you tore out heater core

Jan 13, 2009 | 1997 Pontiac Grand Am

3 Answers

1999 Crown Victoria


the heater core is leaking.

Oct 24, 2008 | 1999 Ford Crown Victoria

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