Ok so Ive replaced tstat, flushed heater core and truck runs at normal temp and the heater hoses both feel hot but low heat output. Pulled glove box down and blend door motor is working along with the door itself from what I can hear. After a 20 min ride it starts to warm up but not a lot. It is a 99 3.0. Help me please. Am I gonna have to cut open heater box just to make sure door is moving all the way

Where do you live and how cold was it outside where and when you were testing ?

In Alabama been checking all week from 20- 40 degrees

OK, well that's not the problem then.

Have you checked the position of the valve on the hose going into the heater core to make sure it is opening when you turn heat on? It may be a vacuum issue...

I have bypassed that for now

Have you burped the cooling system properly? Sound like you may have trapped air(air pocket)in the system.

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Julius

You by-passed the flow valve?

Yea bypassed it. Took it off made sure it was open and i blew through it fine. The vacuum hose works it properly but i just went ahead and took it off for now until i figure it out

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Well julius i have taken the rad cap off and cranked it and let if spill over a bit. It is circulating through overflow jug

Hum... Yeah, either the water is not hot enough or it's not making through the core or the air is not blowing over the core and getting to the cabin... I'll turn my heater on and see what the hose temps read under the hood. That should get you a reference to see if hot coolant is getting in and over the core if you do the same...

It seems hot enough coming in and out. 185 tstat thats close to boiling so hoses pretty freaking hot

Well... If they are both hot then that seems to indicate the coolant is making it through the core. That would only leave air across the core. I just had my dash out to replace the core but I don't remember where the door was that routed air accross the core. Seems you could figure that out without having to 'cut' something open...

Running into this same issue on my girlfriends dad's truck. His is an 04 with a 4.0 but I'm gonna look it over today. If I find anything to solve it I'll be sure to let ya know.

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2004 Ford Ranger XLT FX4 Level II : Weekend Driver (Oct. 2013 TOTM)
2003 Ford Ranger EDGE 4x4 : Daily Driver
1991 Ford Ranger XLT 4x4 Small Block Stroker : On going project
1994 Ford F350 Turbo Diesel 4x4, Short Bed Single Cab : On going project
1967 Ford Mustang Coupe : Restored to original

Install a motorcraft 190 or 192 tstat. What 185 degree tstat did you use?

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2004 Ext Cab, 4WD, 4.0, Auto, 154k. (4.0 engine is out of a 2009 Ranger w/96k) ( as of 7/1/2017)

2004 Ranger, Ext Cab, 2WD, 3.0, 5 speed , 4WABS, crank windows, no cruise, Edge 116k.(6/5,2014) (SOLD).
1999 Ford Ranger, Reg Cab, 2.5, 5 speed, 2WD, no AC, 150k (SOLD).

I'm putting a thermostat in it today, but I'm suspect on the fact that he told me he flushed all the coolant about 2 months ago I'm betting that there is air in the system.

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2004 Ford Ranger XLT FX4 Level II : Weekend Driver (Oct. 2013 TOTM)
2003 Ford Ranger EDGE 4x4 : Daily Driver
1991 Ford Ranger XLT 4x4 Small Block Stroker : On going project
1994 Ford F350 Turbo Diesel 4x4, Short Bed Single Cab : On going project
1967 Ford Mustang Coupe : Restored to original