2005 GMC Sierra "not hot" Questions

Heater no hot air Doesn't blow hot air Your thermostat could be staying open,not letting the coolant to get hot,or your heater core is bad,usually leaking by driver side floor board.

...the heater hoses. Supply to heater was hot, return hose was pretty warm but not hot like supply. losing any fluid...fogging windows, I hate to say it might be your heater core clogged or small ...

not work, your engine will overheat, especially in a hot climate like Belize. This would explain why your floorboard is hot. You must get this fixed, because overheating can damage your engine. By the

...HOT WHEN I PUT IT BACK ON IT WILL BLOWW COLD AIR AFTER ABOUT 10 MIN AFTER REPLACINGIT IAM NOT LOSING ANY WATER Need more information. The most important thing would be to watch the heater water valve ...

...hot just from going a couple of blocks? Make sure that your catalytic converter and exhaust is not plugged..Also check for propper map sensor operation,the reading that the map sensor supplies to the ...

...a few days ago the heater was blowing hot hot air now nothing THERMOSTAT REPLACE IF NOT SEE IF HOSES ARE CLOGGED SHOT OF AIR COULD HELP OR DISSCONNECT BATTERY CABLE 10-15 MIN CONNECT BACK TRY ...

...not blowing hot air, turned off the truck and started it again and it will blow hot for 5 seconds and turn to cold again. have you come across this problem before It is running a test cycle and ...

not been driven for a while because of the hot coolant that will burn you when you remove the radiator cap. If the coolant is full, then reinstall the radiator cap because this is not the problem with

Heat works sometimes but when it does its not hot. If the radiator is full of coolant, and the heater hoses are getting hot, the problem could be a blend door under the dash or the controller.

...motor is clear of any heat source which is causing the lead to get too hot..this till can make the current from the battery not get to the starter motor..hope this helps, let me know how you get