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My heater used to get stuck on hot, then suddenly stuck on cold when steam started shooting upwards from the back, left of the engine where the pipe goes in to a metal block - sorry foor unspecific names, i'm no mechanicThis car is my lifeline as with many people. I need help if you can help me please try.

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  • Cars & Trucks Master
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Think a heater hose has split on the connection so either renew it or cut the damaged bit off and refit ,dont forget the antifreeze as its also a anti corrision agent as well.

Posted on Dec 28, 2013

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  • Cars & Trucks Master
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Should of mentioned what kind of vehicle it is... you may have blown a heater hose or something...

Posted on Dec 28, 2013

Testimonial: "ford fiesta 1.3 51 plate"

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6ya6ya
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Posted on Jan 02, 2017

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SOURCE: HEATER DOES NOT STAY HOT IT STARTS THEN IT GOES COLD

Check radiator fluid level. The heater core sets higher than the engine. If fluid gets low, air bubbles will go to the highest point. The heater core. Check temperature guage. Is engine warming up to normal range? If not change the thermostat. Also check radiator cooling fans with engine warm.
On my car if I set the heater control on anything other than "vent" both cooling fans come on and the engine will not warm up. (still haven't figured that one out) I just run the heater in "vent"

If heater warms up when engine is held at high idle(2000rpms) then cools down at idle, you most likely have air traped in the system.

Posted on Oct 11, 2008

Thunder55
  • 318 Answers

SOURCE: engine overheats when heater pipes connected

I think you could be right about there being air trapped in the system.
Or the heater core(radiator) is plugged.
Either way you need a pressurized radiator coolant pump to put the coolant in without air being trapped.
Although,i have seen it done by jacking the vehicle up high enough that the radiator was now higher than the heater core level, and then the coolant was put in.
But this is dangerous to try.

Posted on Jan 29, 2009

motor1258
  • 6674 Answers

SOURCE: How to replace thermostat on

Do this when cool. Take radiator cap off, start the engine, turn on heat (not defrost) and now top up coolant to about an inch or 2 from top of radiator, as level drops down, and let vehicle run until the radiator fan comes on, then off, about 3 times, and add coolant as needed while it's running. After that, put radiator cap back on tight & make sure return bottle is filled to proper level. Now try that & see how heat is, temperature gauge etc, and keep an eye on return bottle level for a while. Let me know how it is.

Posted on Mar 27, 2009

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SOURCE: pipe going to water heater hose leaks at engine block

it is a quick hose conecter . the conector needs to be replaced . not a easy job because they tend to break off in the engine . you may want to take it to a shop

Posted on Jun 02, 2009

  • 1 Answer

SOURCE: bmw 520i 1984

Hi, will wheels from 1997 520i fit 2000 523i thanks

Posted on Jan 08, 2010

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1 Answer

Heater not getting hot


You need to check the car t cold start up by checking both the lower and upper radiator hoses. After a few minutes one should be hotter than the other. If not the themostat may be stuck open. also chech to ee if there is heater contro valve from the engine to one of the hoses going to the heater core and see if it actuates by moving the temperature control from cold to warm.

Dec 15, 2013 | Cars & Trucks

1 Answer

Change heater core water pump one pipe get hot


try some comma's?
my wild guess, is you are trying to fix a dead cab heater, right?
and if so, can be caused by 5 things wrong. total.
1 engine coolant not hot (180F or more)
2; fan dead.(cab heater fan)
3:or core , coolant path blocked. (seems you)
4; core exterior core blocked with leaves or pin needles. (sucked in)
5: optional core valve , stuck closed. (cable bad, etc)\



one pipe hot , means ,? core pipe 1 is hot, and other is dead cold?
this flow blockage , bingo !

if pipe 1 is 180F and other is 120f this is normal the heater is heating air in the cab and is dropping due to this heat exchange. (normal)
so why not do the 2 year full flush service now. (skipped i bet)
core hoses:
remove the 2 hoses on engine side, never core side (easy damage)
then back flush both hoses. with a garden hose.
if there is a valve there, test it and make sure it's opening... and free flowing.
and that both engine water ports are open too, from heater hose
to engine. (yes, they pack up too)

Dec 07, 2013 | 1998 Toyota Camry

1 Answer

Toyota heater no warm air for 15mins


Sounds like an air lock!
To Check....
With engine cold set heater to hot position.
ID return pipe from heater under the hood. Remove the return pipe at one end to check if coolant is there ( it should run from heater pipe) if no coolant you have an air lock.
To remove air lock top up coolant header when engine is cold. Leave heater in cold position replace pipe and start engine. Allow it to come to working temp then set heater to hottest position. Allow a few seconds and check if the pipe you first removed is hot. If no then ease the securing clip and carefully allow air to escape while engine is running... place a cloth over this area to prevent hot coolant spraying out. When coolant appears re-tighten pipe.
"PLEASE BE VERY CAREFUL DOING THIS AS COOLANT WILL BE EXTREMELY HOT".
If you're not confident enough to do this ask a qualified mechanic to do it for you.
Again please be careful.

Oct 24, 2013 | 2000 Toyota Land Cruiser

1 Answer

Heater blows hot nnnnnnnthen cold ,,,,,,stays cold


To start, the first thing I would check is the fluid level in your cooling system. Do not remove the radiator cap if the engine is hot! The water will shoot out like a geyser and you could get burned or scalded by steaming hot water. Best to check it when the engine is cool.
If you need to add fluid it should minimally be a mixture of 50% water and 50% antifreeze. This way the fluid won't freeze in the winter or overheat in the summer.

Check the hose that runs from the radiator cap to the overflow container. Make sure it doesn't have any holes in it and it is not plugged up. Make sure the overflow tank has fluid in it to the level indicated on the tank.

These are basic, simple things to check. If these don't remedy the problem other possibilities are a bad thermostat, water pump, radiator cap, or a plugged heater core.

Feb 15, 2013 | Cars & Trucks

1 Answer

My australian ford ka (not a laser or focus)heater is having difficulty blowing hot. have changed thermostat which is fine but still no heat or some. my model does not have the heater tap in engine bay. so...


sounds like the hot cold valve has stuck its behind the wiper panel having 2 pipes in and 2 out and a 12v plug on it check the voltage too this too should be 12v when hot is selected on the heater control panel also carfully feel the pipes if one is really hot and one cold the valve has stuck closed there about £5 from a car breakers not that difficult to change with minimal tools or pay a garage anything from £90 too £150 for the repair.

Sep 01, 2010 | Ford Laser Cars & Trucks

1 Answer

2006 pathfinder heater goes from hot to cold the coolant is not low !


This issue may be due to a restricted radiator. The engine heats up but can not flow through the radiator fast enough and pushes the coolant into the overflow until it runs over. Then the engine draws coolant back in showing a low condition.

My suggestion is to check the radiator with an electronic tool for checking temperature. If the temperature is 180 - 200 on the upper hose and 75 - 95 on the lower hose then the radiator needs to be replaced.

A faulty thermostat (stuck open) would not heat up.

A faulty thermostat (stuck closed) would not cool down, but would push coolant out of the overflow tank.

If the vehicle has white smoke (actually steam) coming from the tail pipe, then you most likely have a blown head gasket.

Dec 11, 2009 | 2005 Nissan Pathfinder

1 Answer

Will not blow hot air.


the jeep cherokee are fitted with a heater valve that sometimes get blocked or stuck in the same place .Start by checking weather the heater pipes going in to the heater matrix are hot if both pipes are cold then your looking at a thermostat problem and if only one of the pipes are hot then its more than likely to be the valve

Oct 28, 2009 | 2000 Jeep Grand Cherokee

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

Engine overheats when heater pipes connected


I think you could be right about there being air trapped in the system.
Or the heater core(radiator) is plugged.
Either way you need a pressurized radiator coolant pump to put the coolant in without air being trapped.
Although,i have seen it done by jacking the vehicle up high enough that the radiator was now higher than the heater core level, and then the coolant was put in.
But this is dangerous to try.

Jan 29, 2009 | 1999 Ford Escort

1 Answer

No heat and leaks antifreeze


you're on the right track. grab a flash light and crawl under your truck to look for trails left from coolant leaks. if this is happening only when you turn your heater on, but the engine runs fine and there's no leak any other time, it's either you're heater core, or just the hoses going to it. look above the exhaust pipes, all the steam rolling out from under the hood is the coolant hittling hot exhaust or the hot engine.

Jan 24, 2009 | 1996 Ford Explorer

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