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I have coolant smell and mist inside cab. Will radiator flush and coolant replace, thermostat replace solve this problem? If not what is the cause and remedy?

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HI, No sorry to say a flush and t stat wont fix this. The condition your decribing indecates the heater core has a leak or possible a hose leaking into the core from outside but this only happens on a few types of GMs. If the heater core is leaking then the only repair is to replace it. The core itself isn't repairable. Your local parts store will carry dozens of "stop Leak" these snake oils can work temporally but they have bring along issues of their own. loss of heat from the heater core, clogging of the cooling system ect. But they are a much cheaper temp repair if they work to keep you on the road.

Posted on Aug 27, 2010

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Hi it sounds to me like the thermostat has packed up and this has caused pressure to build up in the coolant system then this has caused the heater matrix to blow, this is located behind the dashboard and is a nightmare to replace as the dash has to come out to get to it.

the heater matrix is the only part that can cause coolant to get inside the car so this is the most likely cause. usually its the thermostat failing that causes this but you need to bare in mind that the head gasket failing can cause the same symptoms

the first thing i would do is take the thermostat out and then pour some boiling water into a tub then have a look at the thermostat in its closed position then put the thermostat into the boiled water and leave it in their for 3 or 4 min then take it out if it has then opened up then the chances are your head gasket has gone and your engine will need replacing, if it stays in closed position then you will find that its just the thermostat that has gone and you will also need to replace the heater matrix, this is a big job and you will need a haynes workshop manual if your doing the work yourself as their is loads to do.

if you google how to tese thermostat you will find sites that will show you how and explain what i just told you so have a look and you will see what i mean on testing the thermostat it easy to do and it will then tell you if its the thermostat or the head gasket that has failed.

if the thermostat stays shut then it is no good and the head gasket should be ok.

if the thermostat opens then this is bad news and you will need to get the head gasket changed.

let me know how you get on or if you need further assistance ok

plz rate this solution as i have a whole page on unrated posts, thanks

Posted on Aug 27, 2010

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It sounds like you have a leak in the heater core. a temporary fix is a can of radiator stop leak, or you can loop the heater hoses togerther under the hood to bypass the heater core. Actual replacement of the heater core can be an expensive repair.

Posted on Aug 27, 2010

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if the thermostat is in the head at the top radiator hose , remove it an fill the cooling system until the water is at that point --refit the thermostat and continue filling
make sure that the heater is turned on so that any air is moved out of the system

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It would appear your thermostat is stuck in the closed position , find where it is on your engine, drain coolant and remove thermostat housing and stat, replace housing(liquid gasket OK) and coolant. now run engine, turn heater controls to hot leaving filler cap off, top up any water to max and replace cap now warm up to temp until fan comes on. if all ok replace thermostat with a new one and new gasket, you could also flush the sytem out at the same time with a hose pipe by loosening one of coolent pipes and flush radiator.

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Drained radiator added prestone Radiator flush refilled and started overheating, drained radiator replaced thermostat and now I get no heat from heater,Radiator water is hot

disconnect the heat hoses going into fire wall , put hose into one with pressure and flush as it sounds like it could be bloked in the heater core,the other thing that could be the problem be the hot ,cold switch as it restricts the flow to makes the heater hoter or colder , it might need tlc or replacing as it is manaul not elec

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I have a 1999 sierra 1500 4 w drive truck and my heat core blows only gold air. can anybody tell me what is the problem?

Before assuming the heater core is blown check the following.

1. Check coolant level while engine is cold.
2. Leave the radiator cap off and let the engine run. See if you can see the coolant circulate
when the engine is brought up to temperature.
3. Check the temperature gauge inside and note if the engine temp is correct.
4 Does the engine overheat?
5. Feel the heater hoses and check if they get hot.
6. Can you smell antifreeze inside the cab?

Start here and let me know.

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It Started about 6 months ago on my 2005 chrysler Pacifica v6 3.8. my upper radiator hose colapses when i rev the engine up and it gets really hot. i can tell by the smell. i have replaced my thermostat...


Dec 14, 2010 | 2005 Chrysler Pacifica

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If your referring to your coolant temperature is running hot this could be caused by a number of things first i would check and make sure your coolant level is full and that your drivebelt is tensioned properly, after all of that checks out, check for a potential problem with your thermostat being stuck closed you could usually verify this by checking the temperature of the upper and lower radiator hoses if the bottom radiator hose is very hot but the top hadiator hose is luke warm that most likely mean the thermostat is stuck closed and is not allowing the hot coolant to escape the engine and go to the radiator if both hoses are hot the thermostat is working, next feel the upper half of the radiator and the lower half of the radiator if theres a big difference in temperature there this usually means theres a blockage inside the radiator and a flush may be needed or a radiator replacement if a flush doesnt work, if the coolant system appears to be cirrculating coolant properly there most likely is a problem with your head gasket causing the engine not to be able to maintain its temperature correctly....

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3 Answers

Luke warm heat in a 2002 expediton

Start with Flushing out your cooling system. Flush it out with Preston Radiator flush, you have your preference of ether the super flush which takes 3-6 hours or the 10 min flush which is good if you don't have the time to flush out your cooling system.

After you have flushed out your cooling system, replace your thermostat and you should be good for another cold winter driving. What happens is that after a few years of the coolant not being serviced, the coolant crystallizes and clogs up the heater core and radiator causing poor circulation. Poor circulation will cause poor heat and or overheating issues to the engine.

Before you go through all that inspect to make sure you have the right amount of coolant in your cooling system.

Good luck and thank you for using fixya

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Radiator coolant fumes inside cabin

There is a chance you may have an engine bay coolant leak and the fumes are being drawn in through the heater ductwork so verify that first.
Coolant fumes inside usually come from a leaking heater core. The heater core is like a small radiator inside your vehicle that gives off heat.
Problems like this arise from coolant that has not been flushed and creates an electrolysis that eats away at the material causing a leak.
This is not a job for a do it yourself guy(or girl). A pro could easily spend 5 to 7 hours changing this one.
Make sure whoever does this repair flushes the system.

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I have a 1994 Saab 900SE. It is running hot but there is no leakage of fluids and the fan is working. Does the radiator needs flushing or do I need a new thermostat?

The leak can be in form of steam /. mist from the freeze plugs on the engine block.

Coolant system should be flush every 2 years or 24,000 miles.

As a preventive measure,you should replace the $15 thermostat every 6 years and check the radiator/coolant cap condition.


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1 Answer

Smell of radiator fluid in the cab

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