Van run a run temp drive get heat out frount vent slow down it go cool heat in rear of van stay hot
SOURCE: leaking coolant from rear heater core in my astro van
you can hook the two line together that will fix your problem with no problems
SOURCE: Heating system only blows out hot air through the vents
I would look at the air blend doors first, it sound like they are not working or your control in the dash is not working send a signal to them. they work by changing the air from hot to cold or in between.
Avalanche, Sierra And Silverado
To install:
C/K Series
To install:
SOURCE: WILL NOT SWITCH AIR FLOW STUCK IN DEFORST VENT
when your car is in defrost it has an ac cycling it removes the moisture then sends the air over the heater core depending on how warm you set it you can feel warm or cold but the ac is always cycling...ridding the moisture...you need a good ac tech it will be okay...its just expensive going into the heater core if needed...!
SOURCE: 96 suburban air conditioning blows out cool in front hot air back
Am investigating same problem. Download the free technical manual and you can find a diagram for the air mix door. If this doesn't shut you will be getting lots of heat through despite the cooling of the Aircon. I don't know how to get at it or fix it but it describes how to run diagnostics - you don't need specialist tools for this. Also a blocked pollen filter probably won't help.
SOURCE: Temperature gauge fluctuates and the heater blows cold air
Definitely check your fluid level in your radiator. Top it off all the way. I've seen that happen multiple times on cars that were low on anti-freeze. If that doesn't work try replacing your thermostat. It's cheap and the easiest place to start if topping off the fluid doesn't get you fixed up.
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