Blend door would be my guess... have you pressure checked the coolant system?

At this point I also think you may have reversed some lines somewhere... or you might possibly not have enough coolant in the system... so check your levels where possible and make sure it's all right.

Also what Temp rated Thermostat did you put in?

 

its an oe replacment so i cnt rememebr, the levels are all good i check them weekly haha i own a trail rig so im use to always checking oil and fluid levels haha. just a question how will a pressure test help?

 

Are BOTH of the heater hoses hot?

 

havent accually paid attention to that sadly enough, i will check tomorrow morning when i get to work

 

Fixed my problem. What was happening was that I had a LOT of rust settle in the lower radiator hose. What was happening was since I replace the radiator (and not the hoses) the knocked the rust loose and it was slowly making its way to the core.

needless to say I replaced all hoses, back flushed the core and also added an inline filter right before the core. I have had excellent heat for two weeks now.

 

That is why we suggested to flush it forwards and backwards... glad your problem is solved

 

hey i checked thismorning yes both hoses are hot, so im going to guess a blend door? idk the first thing about these doors , can i manuely open them to heat till next year when it warms up?


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lol doubtful... do a search on here for them... there is complete threads on what to do to fix them....

 

X2
what kind of filter?

 

other than the fresh air /recirc, you will have to take the entire dash apart.
that will only allow to remove the actuators, if those are inoperable.
If there is a problem with ANY of the dampers themselves, which seem to be problem prone, no, you won't be able to do anything. You will probably then have to remove and disasemble the HVAC box, and repair the damage.
On a side note - on a single temp. control unit - with the blend door actuator removed, if the damper is ok........ it will 'slam' to full heat mode on 'hi fan'.
on no or low air flow, that damper will go to an intermediate position.