Have flushed and flushed system water runs through heater core both ways. I have never had so must trouble trying to get heat in my life. Rear heat ok. Front different story. What in the world is the problem. Heater hoses to front heater core luke warm rear hot. terry

 

Have you checked the termastat? Sounds like the water is not is heating up, what does the temp gage say?

 

Temp heats up fine gauge about 1/4 also has rear heat and it gets hot.

 

With your heater hoses only luke warm, and the gage only 1/4 up, it sounds like the engine is not getting warm enough. My gage runs from the middle up alittle, but without a manual gage it is hard to say what the real temp is.

 

Would the back vents get hot if temp not hot enough. I bought this van new in 1990 it never has reached 1/2 way alwys 1/4 or less, I have put sever thermostats in it one about a year ago.tHis has been going on sometime now but with rear air I just kinda let it go but would love to find problem. thanks

 

There is something stopping the hot water from getting to the front heater core, maybe one of the heater supply lines has a internal colapse that is slowing down the water. Sorry I can't think of anything else.

 

I put a backflush t on both lines to backflush. Water goes through fine but when I leave cap off water runs internittendly. Not sure what causes this.Thanks for response I do appreciate it.

 

heater hoses reversed on core which prevents core air purging?

 

I think 96_4wdrv's suggestion makes the most sense. The inlet has to be at the bottom of the core or you won't get any flow through.

 

I have 3.0 engine which hose goes to top and bottom .One from waterpump goes to top now. is it correct.

 

Where does the top hose on heater hook too. I put a core in several years ago surely I didn t cross them. But it has haappened before. Water runs into heater core from top hose now . terry

 

water flow from engine comes from pipe next to thermostat housing and into bottom core fitting

water flow back to engine water pump comes from top core hose and goes to water pump fitting

later model Aeros have a vacuum controlled valve in the heater hose near the core inlets to stop coolant flow when the A/C is on.

these do fail or vac. line falls off
must be working thought if you have full flow with water hose thru the core

 

I have a T fitting on top hose for backflushing.When I run water through with hose it seems to run fine.When I run engine with heat on cap off T water seems to run through o k.Mine is 1990 and does not have a heater core valve on heater hoses . What controls warer to core or does it pass over core all the time I dont think it does.

 

depends on if the outflow heater hose is before or after thermostat.

after thermostat = water flows thru anytime thermostat is open and water pumps is spinning

before thermostat= water flows whenever water pump is spinning

after what occurance or maintenance did the problem appear?
overheating, heater hose replacement, thermostat replacement, heater core replacement?