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Replaced two metal pipes in rear to the rear heater now the check engine light is on and the fan stays on why?

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Posted on Jan 02, 2017

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SOURCE: just replaced two metal pipes in rear to the rear

run motor witout radiator cap on. it just needed burped

Posted on Jun 28, 2009

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2 Answers

How bypass a rear heater core on 2003 mazda mpv


bsm240's related answer is short & to-the-point

find somewhere along those 2 heater core hoses where you can put a "heater hose union" and 2 clamps

i prefer a metal/brass one over a plastic one, just for longevity

http://www.downwindmarine.com/images/P/890829.jpg

or depending on your situation, you can just buy a hose and 2 clamps to connect the metal lines to each other

ps: there was a recall about this

MPVClub com View topic Dealer words Recall for Rear Heater Pipe coming

read the 14 page thread about all the owners having the same problems with this rear heater core problem

Apr 08, 2015 | Mazda Cars & Trucks

2 Answers

Heater not working well


flush out the engine. use a hose pipe and flush engine out, take both heater feed pies off and go back and forward with the hose pipe on them until water is clear. then test by blowing down the pipes both ways after blowing down them back flush them again. refit every thing and fill the system.leave the rad cap off. get engine up to temp when fan kicks in. have the heater on full wile doing this. squeeze pipe as engine warms up to temp to help get the air out. keep topping up the water keep it at hand hose pipe or watering can. when up to heat turn off engine. if engine fan stays on remove the fuse for it as you need the engine to stay hot. when engine is cooled down top up with antifreeze. not mixed stuff full on strength type. then it should be fine for another year or so. always remember even in summer when its hot always use the heater even just for 5 minutes will help stop this same in winter with a/c. every now and then just turn it on.

Oct 15, 2013 | Audi AllRoad Cars & Trucks

2 Answers

2000 ford taurus air from heater gets cooler when fan speed is turned up did a flush put in new thermostat, did not help


You have to disconnect the heater hoses right at the heater core and flush the core by it self. I have done this numerous times with good results.

Dec 06, 2009 | 2000 Ford Taurus

2 Answers

The rear heater lines, metal pipes, have Is there


Have you thought of sandpapering the lines clean, then using JB Weld?

Oct 29, 2009 | 1994 Plymouth Grand Voyager

1 Answer

No heat air is blowing cold


First you have to identify what causes the problem.
To do this you have to:
1) When engine is cold check the level of coolant. If it is low fill it up.
2) Start engine and check if engine reaches regular temperature. If your engine is not heated enough it means your thermostat does not work properly and should be replaced.
3) If engine temperature is normal, then check the temperature of pipes that go to/from heater core. These pipes are located up the fire wall (easier access is from the passenger side). If pipe/pipes are cold (even engine is worm) it means you heater core is plugged and should be flushed. Keep in mind, flushing the whole cooling system is different from flushing heater core.
4) If pipe/pipes are hot/warm, turn off the fan, switch controller to the hot position, wait for 3-4 minutes and turn on the fan. Note if the cold air blows first or warm air blows first but it cools down in 5-10 seconds. If the air blows cold than it is most probably the problem with blend door or blend door actuator.
5) If air blows warm first and then cools down, then while running engine and remaining the transmission in PARKING position, press on the gas pedal until your engine reaches 3,000 RPM. Check if your heater blows warm/hot air. If it does, then your water pump does not work properly and should be replaced. If the air still cold, I would suggest to flush the heater core.

Oct 22, 2009 | 1998 Ford Taurus

1 Answer

MY 1998 FOR TARUS HEATER WILL NOT WORK.WAS DRIVING


It is most probably the problem with blend door or blend door actuator. But just in case I would suggest to follow the entire procedure:

First you have to identify what causes the problem.
To do this you have to:
1) When engine is cold check the level of coolant. If it is low fill it up.
2) Start engine and check if engine reaches regular temperature. If your engine is not heated enough it means your thermostat does not work properly and should be replaced
3) If engine temperature is normal, then check the temperature of pipes that go to/from heater core. These pipes are located up the fire wall (easier access is from the passenger side). If pipe/pipes are cold (even engine is warm) it means you heater core is plugged and should be flushed. Keep in mind, flushing the whole cooling system is different from flushing heater core.
4) If pipe/pipes are hot/warm, turn off the fan, switch controller to the hot position, wait for 3-4 minutes and turn on the fan. Note if the cold air blows first or warm air blows first but it cools down in 5-10 seconds. If the air blows cold than it is most probably the problem with blend door or blend door actuator.
5) If air blows warm first and then cools down, then while running engine and remaining the transmission in PARKING position, press on the gas pedal until your engine reaches 3,000 RPM. Check if your heater blows warm/hot air. If it does, then your water pump does not work properly and should be replaced. If the air still cold, I would suggest flushing the heater core.

Oct 17, 2009 | 1998 Ford Taurus

1 Answer

Heater not working


First you have to identify what causes the problem.
To do this you have to:
1) When engine is cold check the level of coolant. If it is low fill it up.
2) Start engine and check if engine reaches regular temperature. If your engine is not heated enough it means your thermostat does not work properly and should be replaced.
3) If engine temperature is normal, then check the temperature of pipes that go to/from heater core. These pipes are located up the fire wall (easier access is from the passenger side). If pipe/pipes are cold (even engine is warm) it means you heater core is plugged and should be flushed. Keep in mind, flushing the whole cooling system is different from flushing heater core.
4) If pipe/pipes are hot/warm, turn off the fan, switch controller to the hot position, wait for 3-4 minutes and turn on the fan. Note if the cold air blows first or warm air blows first but it cools down in 5-10 seconds. If the air blows cold than it is most probably the problem with blend door or blend door actuator.
5) If air blows warm first and then cools down, then while running engine and remaining the transmission in PARKING position, press on the gas pedal until your engine reaches 3,000 RPM. Check if your heater blows warm/hot air. If it does, then your water pump does not work properly and should be replaced. If the air still cold, I would suggest flushing the heater core.

Oct 17, 2009 | 1998 Ford Taurus

1 Answer

Heater not working, engine fan keeps coming on


check to see if you have an air lock in the water system take of a hose and flush it through
also check to see if heater hoses are getting warm is there enough water in radiator
top rhs of engineis a bypass pipe lots of folk remove it and replace with straight pipe

Jan 20, 2009 | 1999 Volkswagen Golf

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