How to replace the heater core on a 2005 caravan

Hi there.
Well you can either have a problem with either radiator outer {dust/dirt in outer core of radiator or clogged up inside were water goes, or soft hoses,blowen head gasket plus a few others ,but first go to garage to were you blow up your tyres and use the air hose and blow out the radiator core where the air goes in, 2 drain out radiator water and then refill with water at 1 ltr at a time and then check your info car book and find how much water the radiator takes ,if it dosent take all the ltrs then the radiator is blocked inside.
if engine runs rough missing etc then get your Head gasket checked out.
When you say no heat is that with heat on gauge or no heat from heater, as it could be heater blockage same as radiator core. So let me know how you get on.

if you have a leak inside it may be a heater core problem which can cause all your problems. check it by doing a pressure test on the cooling system.

2 things causes drips #1 a/c evaporator if drain hole is plugged and creates a musty smell #2 is the heater core easy test is the radiator level will be low or empty

will try to help. is your radiator full of fluid? sometimes there will be an air lock, or [air in hoses] with the engine running at first started!!! take the radiator cap off, fill with 50/50 antifreeze. or if you are in alaska, seek advice from local parts store on level you need for coverage.you may have a bad bad heater core, but not likely because you would say you have fluid leaking onto passenger side floorboard.you may have purchased the car used?somewhere there is a blockage in your system.either a bad radiator,heater core,i will try to help because i've had same problem,in the FRONT OF RADIATOR]place a small peice of cardboard in the front of radiator!!ONLY COVER HALF OF THE RADIATOR] slide it down in front of the radiator on the side of the part where the radiator fan is not at. then you will have heat. if yout engine temperature rises to unsafe level, cut cardboard in half and replace!!!make sure;to put in front of the radiator only!!!this will apply heat to car while in motion!

The problem sounds like either the inlet or outlet hose to the heater core is cracked or split. Or the heater core itself is at fault. Need to inspect the hoses from engine to the firewall going to the heater core for damage. If no leak from the outside then problem will be on the inside under the dash. Hope this will help you.

Where is it leaking from? The radiator its self, the heater core found under the dash, or some where in between? Look for pools of coolant under the front floor mats, If you find it there, then the heater core needs to be replaced. Next time it happens, Pull over immediately and look under the car to see where it is leaking, (look from more than one angle). Or park it over some clean cardboard, where ever the stains are, will give you a clue of where to look for the problem. And most easy, Bring it back to the mechanic who installed the new radiator., Most legitimate mechanics warrant their work and yours may be responsible in some way, or at least be familiar with your particular Caravan.
The solution is to locate and fix the leak, but also perform a thouro cooling system flush. The system bay have serious dirt, clay, or corrosion that is causing issues with proper flow and pressure, thus causing leaks.
And Always Pull Over when it begins to OverHeat! Heat damage to an engine can spell Death to any Car, even Caravans. Good Luck.

Very easy if you go through the lower part near the peddles

Is it wet with water or coolant? If it is coolant you have a damaged heater core. If it is water it could be from a windshield with a bad seal, a leak in the floor or possibly an air conditioning system with a plugged drain tube. There is nothing else that would bring water in from the vehicle. If your are a cold climate and snow gets in on someone's boots it will melt and wait till dry weather to clear.

look at the firewall on the engine side and you will see a small stub hose coming out on passenger side about even with the bottom of the heater box inside. that hose drains condensation from the ac...clear it out and you will have a dry floor. (unless heater core is leaking but you didn't mention any overheat or coolant loss so likely that's not a problem)

sound like the heater core. you can bypass the heater core. there are 2 hoses under the hood on the pass side of the vehical on the fire wall undo the hose clamps on both hoses and ties the 2 hoses together