Start at the begining. Run vehicle til radiator hoses are hot. then check the heater hoses, two smaller and thinner looking radiator hoses near the firewall entering the vehicle. Hold the hoses with your hands from the engine compartment, if both of these hoses are getting hot, then you have a blend door problem, where it may be stuck in the cold position. if they are not too hot to hold then the issue is with getting the water hotter. such as a thermostat. try this and keep me posted.
The blend door moves by a cable or an electronic motor. The heater box is located behind the glove box. look for the door, you'll see the cable or motor attached to the blend door post. remove the cable or motor and manually move the door, then see if you have proper heat. at times I find glove box items get jammed in blend door. Otherwise follow cable back to temp control head and see if it moves when you move knob from hot to cold and back. Keep me posted.
Are you getting air thru the vents of any temperature?
If cold air is coming thru then the blend door may be broken internally, and I would suggest you have a professional take over the repair, the dash must be removed to access this.
If no air is coming thru, then the blower motor may not be functioning. Please keep me posted.
If the hoses are hot and you are only getting cold air, the heater core itself appears to be clogged and in need of replacement. Keep me posted.
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Hi SCR13
I had my 2001 mpv heater on for 20 minutes and found both smaller and thinner hoses near the firewall entering the vehicle were hot. What do I need to do to fix the blend door.
Thanks
Hi Scr 13
I took off cable from blend post and manual moved them both of them work ok but still no heat. please let me know what is the next step I should do.
Thanks
Hi Scr13
after warm up the van for 25 minutes I found heat but very little, should I change the thermostat?
Thanks
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