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Hello and thank you for your question,If you warm the engine up to normal operating temp and raise the hood and place your hands on both heater hoses on the passenger side of the firewall with the heater on and the engine running , are both hoses getting nice and hot?
There are two black hoses on the passenger side at the firewall next to the AC/heater plenum (about the size of a garden hose).
There kind of down low and they are the only two that connect to the firewall to the heater core. You may need something to stand on to reach them.
Okay then that means you have good flow though the heater core and if you are still not getting any heat in the cab the problem is usually caused by a failing blend door actuator located under the dash on the AC/Heater plenum. I have enclosed the replacement steps in the link below, if you follow them closely, this is a repair you can likely do your self. Copy and paste the link below to your browser to open and view the steps.https://dl.dropboxusercontent.com/u/104923897/Blend%20Nov%2028.pdfPlease take a moment to rate my service so I can get credit for my time, the question remains open for follow up even after doing so, all you need to do is return to this question if need be.Thank you again.
Well if the door is opening and closing and you have good coolant flow though the heater core you should have hot air.
Well if you are 100% sure the door is closing then go back and recheck the heater hoses, both need to be to hot to hold if you have good flow.
Okay then that is likely the cause, if you have good flow through the heater core on a warmed up engine then you should burn your hand holding on to them to long. If one is not as hot as the other then you either low coolant or a bad thermostat or the heater core is restricted. I would start first with making sure the cooling system is full with no trapped air and I would also look at the coolant temp gauge to see if its reading in the normal range. In most cases if the cooling system is low on coolant and the thermostat is stuck open the gauge will read on the cold side and that will affect the heater as well.
Okay if you sure there is no trapped air then you may want to consider back flushing the heater core, like I said, both hoses need to be nice and hot to get heat in the cab.
Remove the heater hose from it and take a garden hose and force water through it from one side to the other.
There are clips on each hose that you have to squeeze. See the link below. See steps 4,https://dl.dropboxusercontent.com/u/104923897/Step%204%20Nov%2028.pdf
If you take a close look at then you will see they do, there clips are at the ends of the hose and snap onto the heater core out let lines. Send me a picture so we can make sure your looking at the right hoses.
Those the hose and they tee off for rear heat, follow them in under the shelf and that where the connect to the firewall. The instructions I sent are the correct ones.
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Your very welcome and thank you as well.