Heater doesn't work

[Hummer Guy]

2002 M1123

I changed out the heater core and blower a year ago since the previous one had a bad blower motor and I was doing the whole coolant system over at the time, I finally decided now to fix the heat on the truck so I can have proper defrosters but the problem is the heater doesn't work at all, I notice only one of the pipes getting hot that goes to the heater and the other one is basically at room temperature

 

[Mullaney]

2002 M1123

I changed out the heater core and blower a year ago since the previous one had a bad blower motor and I was doing the whole coolant system over at the time, I finally decided now to fix the heat on the truck so I can have proper defrosters but the problem is the heater doesn't work at all, I notice only one of the pipes getting hot that goes to the heater and the other one is basically at room temperature

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Any chance somebody put a cut-off valve in line with the heater hoses?

 

[Hummer Guy]

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Any chance somebody put a cut-off valve in line with the heater hoses?

Possibly, I was thinking the lever going to it may have snapped

 

[Retiredwarhorses]

did you pull the cable to open the hot water valve?

 

[Hummer Guy]

did you pull the cable to open the hot water valve?

Yea I pull the cable knob inside and still the same

 

[Retiredwarhorses]

Yea I pull the cable knob inside and still the same

than go and verify the valve is opening and closing

 

[Hummer Guy]

than go and verify the valve is opening and closing

Will check when I get back home, where is that valve located at? I don't remember seeing it anywhere before