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2003 Mazda MPV Rear Coolant Hose Change, no heat in rear.

I changed the rear coolant hoses that support the rear heater coil a week ago (they were corroded and leaking). Now, no heat from rear heater. Air bubbles in the system, possibly. Hoping they will purge on their own. Any expedient methods to remove air bubbles from system. I tried leaving coolant reservour cap off, starting from cold engine. Still no heat...

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Posted on Jan 02, 2017

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SOURCE: 2003 Mazda MPV trouble codes

check the pcv hose at the back of the intake manifold it often leaks and will cause several idle problems

Posted on Sep 29, 2008

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SOURCE: cold air coming from rear vent of 2000 mazda mpv

Your ventilation shutter is not closing properly.

Posted on Nov 17, 2008

  • 1 Answer

SOURCE: Mazda MPV Coolant Loss (but no overheat)

i had the same thing on my wifes 2000 mpv van...the ends of the radiator are made of some sort of composite type material....it had a slight crack in it....wasn't obvious until it got worse and started streaming water from it when warmed up....even after it cooled enough not to be spewing it was hard to actually see the crack though a few inches long....was hard to even see where the water and antifreeze mixture was coming from until i took out the radiator

Posted on Jan 13, 2009

  • 740 Answers

SOURCE: no heat inside van

THERE IS A DOOR UNDER THE DASH THAT MOVES FROM COOL OR AC AIR TO HEAT CHECK AND MAKE SURE ITS MOVING WHEN CHANGING SETTINGS

Posted on Jan 21, 2010

  • 1 Answer

SOURCE: mazda mpv 2002 coolant leaking somewhere. Filled

it also happen to me on a mazda mpv 2000 for years i was adding anitifreeze i found out that the water pump was leaking just do it yourself easy change just pay $60 dollars for it. underneath the car theres a plastic shield the antifreeze will drip and stay there thats why you didn't noticed the leak.

Posted on Mar 10, 2010

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1 Answer

Engine overheats and heater blowing cold air


You have air trapped in system , change thermostat , bleed air from system , let it run hot while adding coolant with blower full blast on all front and rear heaters .

Jan 23, 2013 | 2001 Audi A6

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Several weeks ago I had a hose burst in the cooling system -- towards the rear of the engine of my 1997 Safari van. Afterwards I started hearing like the sound of trickling water coming from the heater...


It sounds like you still have a leak somewhere, maybe it's a hose clamp that wasn't tightened or another leak. You should check the coolant level in the radiator, not the overflow bottle. If the system has a leak it won't create a vacunm to draw in the coolant from the overflow, the radiator could be very low. The sound you were hearing was air bubbles in the heater corem maybe the coolant wasn't topped off.. If the core was leaking there would be coolant dripping on the passenger's side floor.

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Engine gets hoat some time, no heat from heater. top hose seems hot to touch lower hose is cool. Drained radiator few weeks ago and problem began


Theres a strong possibility being you just changed the coolant a few weeks ago that theres air in the cooling system not allowing the coolant to cirrculate properly, look at your top radiator hose is theres a small bleed valve at the top of the thermostat housing when the upper hose attactes to? If so loosen the bleed valve and allow the cooling system to purge the air out of the system you can tell when the air is out of the system when a steady stream of coolant starts to flow out of the bleed valve, if theres no bleed valve take the top radiator hose off of the engine side and allow the cooling system to purge the air out through the top of the engine that way, but it definatly sounds like theres air in the system not allowing for the cooling system to cool properly...

Dec 07, 2010 | 2003 Mitsubishi Galant

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Just replaced heater core. Had heat for first week. Now I have very little heat on passenger side and none on driver side. All vents blow air.


You might have an other coolant leak, but sounds like coolant is not getting entirely into heater core. Check both your heater hoses to see if they are equal temperatures and also the coolant level. If both are ok check to see if there is a heater core valve that when heat is selected it provides vacuum to pull open a valve that directs coolant flow to your heater core. the valve is located in-line with the heater hoses.

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2002 Nissan Altima blowing cold air,coolant level was low, but coolant was added and it's still blowing cold. A compression check done two weeks ago and shop found no leaks, but the coolant in resourvior...


You could possibly have air trapped in the heater core. The easiest way to bleed it out is to jack up the front of the car till the radiator fill cap is higher than the upper heater hose using a funnel that fits snuggly in the filler neck of the radiator, fill till you have about three inches of coolant/antifreeze above the filler neckthen run the car at about 1500rpms until no more bubbles are evident. Also turn the heater onto face on low speed and feel if heat starts comming out.

Dec 06, 2009 | Nissan Altima Cars & Trucks

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The heater is blowing out cold air. I changed my thermastat but still have cold air.


Make sure the heater control valve is opening and closing. This is likely under the hood near the rear of the engine. There will be coolant hoses connected to it. This valve allows hot coolant to enter the heater. If the valve fails or gets corroded shut, no hot coolant can reach the heater; and you will have no heat.

Oct 17, 2009 | 2000 Dodge Caravan

1 Answer

Coolant leaking on manifold, steaming.No hose or radiator leak.


i think its going to be the head gasket duto the way its leaking coolant. one of the water jackets maybe i would have it checked to be sure but it sounds like head gasket

Feb 03, 2009 | 1991 Toyota 4Runner

3 Answers

Coolant leaking into engine Compartment


Sounds like a blown coolant hose, or a faulty coolant water pump.

Jan 19, 2009 | 1991 Honda Civic

1 Answer

Cold air coming from rear vent of 2000 mazda mpv


Your ventilation shutter is not closing properly.

Nov 17, 2008 | Oldsmobile Bravada Cars & Trucks

2 Answers

Radiator fluid evaporation or leak?


Just had the same problem! I have never had any problems out of my van and just had all fluids checked a month ago before going on vacation. One day it just started overheating and I had to urn the heater to pull the heat off of the motor to keep it cool enough to get it home. I put over a gallon of coolant in it and filled up the reserve tank. The next morning I took my kids to school about 4 miles away and my van started to miss really bad and the check engine light would come on every time I pressed down on the accelerator. I took it home and opened the hood and the reserve coolant tank was empty in just 8 miles of travel so I called the dealer and had them pick it up on a rollback since it is still under warranty. The dealer said it was a leak in the rear heater pipes that circulate antifreeze/coolant to the rear of the vehicle to supply heat for the rear heater and the miss was from the heat of the engine burning the spark plugs. So far it is a dealer item only and parts and labor are about $352. The vehicle will not leave any puddles when running while in park, only leak while moving, so they tell me. The dealer bypassed it somehow until my parts come in and my van drives fine. The pipes (maybe hoses,unsure) are actually a series of 3 that must be replaced. I may try to change them myself if they are just hoses.

Jul 11, 2008 | 2004 Kia Sedona

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