No heater opration?

First you'll need to make sure there's no blockage in the heater core. For the thermostat to cause a "no heat" issue, it would have to be stuck open. Though this is extremely rare, I've seen a few cases. And in those cases, the heat blowing would get hotter as the engine was reved higher, and colder as the engine idled.

This will help us

https://www.2carpros.com/articles/car-heater-not-working

If both of these check out fine, then I'd think you have a stuck blend door or leaking/loose vacuum line/solenoid inside of the HVAC unit. this will have to be removed and inspected.

Where are you getting this 130degrees from? If you have verified that the engine temp isn't getting over that, then the first thing to do is replace the thermostat.

Hi:

Is the blower motor working? If so, check both heater core hoses and let me know if they are both hot with the engine warm and the heat on.

Let me know.

Joe

Your saying the blower motor works ok at higher rpms? I'd have to check voltage at the blower motor connector, when problem is ongoing, at idle.

Note the diagrams. Interior fuse box.

Stick for coolant level?

No heat new thermostat
most common is heater core need flush

Check heater core hoses if both are hot, if not the heater core need to be flushed as a 1st step
these are the steps
WARNING: NEVER REMOVE THE PRESSURE RELIEF CAP UNDER ANY CONDITIONS WHILE THE ENGINE IS OPERATING. FAILURE TO FOLLOW THESE INSTRUCTIONS COULD RESULT IN DAMAGE TO THE COOLING SYSTEM OR ENGINE AND/OR PERSONAL INJURY. TO AVOID HAVING SCALDING HOT COOLANT OR STEAM BLOW OUT OF THE COOLING SYSTEM OR DEGAS BOTTLE, USE EXTREME CARE WHEN REMOVING THE PRESSURE RELIEF CAP FROM A HOT COOLING SYSTEM OR DEGAS BOTTLE. WAIT UNTIL THE ENGINE HAS COOLED, THEN WRAP A THICK CLOTH AROUND THE PRESSURE RELIEF CAP AND TURN IT SLOWLY UNTIL PRESSURE BEGINS TO RELEASE. STEP BACK WHILE THE PRESSURE IS RELEASED FROM THE COOLING SYSTEM. WHEN CERTAIN ALL PRESSURE HAS BEEN RELEASED, PRESS DOWN ON THE PRESSURE CAP (STILL WITH A CLOTH), TURN AND REMOVE PRESSURE RELIEF CAP.
Engine cool
lower the coolant level
Locate the two hoses running to the heater core
disconnect them at the engine side leaving hoses connected to heater core throw the firewall
use garden water hose and compressed air if possible
run the water and follow by air throw one side and out the other and vice versa
do that two to three times watching what leaving the heater core you are looking for the good flow and clear water to run throw
reconnect hoses
top off coolant system
good luck
let me know

Is it heating up to normal temp?
And if so
heater core need to be flushed
Sorry I do not recall seeing dip stick for the coolant level
some have it for the washer fluid

Check heater core hoses if both are hot, if not the heater core need to be flushed as a 1st step
these are the steps
WARNING: NEVER REMOVE THE PRESSURE RELIEF CAP UNDER ANY CONDITIONS WHILE THE ENGINE IS OPERATING. FAILURE TO FOLLOW THESE INSTRUCTIONS COULD RESULT IN DAMAGE TO THE COOLING SYSTEM OR ENGINE AND/OR PERSONAL INJURY. TO AVOID HAVING SCALDING HOT COOLANT OR STEAM BLOW OUT OF THE COOLING SYSTEM OR DEGAS BOTTLE, USE EXTREME CARE WHEN REMOVING THE PRESSURE RELIEF CAP FROM A HOT COOLING SYSTEM OR DEGAS BOTTLE. WAIT UNTIL THE ENGINE HAS COOLED, THEN WRAP A THICK CLOTH AROUND THE PRESSURE RELIEF CAP AND TURN IT SLOWLY UNTIL PRESSURE BEGINS TO RELEASE. STEP BACK WHILE THE PRESSURE IS RELEASED FROM THE COOLING SYSTEM. WHEN CERTAIN ALL PRESSURE HAS BEEN RELEASED, PRESS DOWN ON THE PRESSURE CAP (STILL WITH A CLOTH), TURN AND REMOVE PRESSURE RELIEF CAP.
Engine cool
lower the coolant level
Locate the two hoses running to the heater core
disconnect them at the engine side leaving hoses connected to heater core throw the firewall
use garden water hose and compressed air if possible
run the water and follow by air throw one side and out the other and vice versa
do that two to three times watching what leaving the heater core you are looking for the good flow and clear water to run throw
reconnect hoses
top off coolant system
good luck
let me know

Hello,

This could be a problem with ground 201, behind the right side of the dashboard. In the diagrams down below I have included a wiring diagram of the blower motor circuit for you. Please inspect this ground and make sure that it is clean, corrosion free, tight, and making good metal to metal contact. Please get back to us with what you are able to find out.

Thanks,
Alex
2CarPros

There is only one heater core, have you replaced the cabin air filter?

Greg,
With all due respect, if you don't know where the heater core is, you don't want to go after it yourself. It's located in the heaterbox under the dash. It is a 5 hour job if your god like, average tech 8-10 hours, a d-i-y has it towed to a shop in pieces and pays double what it would have cost to just take it there to begin with.

Try changing the cabin air filter and hope it blocked up first. It is behind the glove, Let me see what I find out tommorrow and i'll update it

I can find a cabin air filter for your truck, nothing on location. Typically the are behind the glove compartment or accesible from the passenger side wiper cowl area.

Two things I am thinking, is there may be a build up of crap in there, not allowing air flow to you, a binding door or cable problem.

Flush out the heater core and make sure the antifreeze level is full.

Does this fix it? Let me k nwo what you find.

Have you noticed a increase or decrease in engine temperature?