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The radiator heater hoses are blowing repeatedly for the past month. Is this a sign of a clogged or failing radiator?

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I am not a Toyota expert, but I will try to help. Has your engine been running more hot than usual? If so, it could be overheating problem and bursting the hoses. It could be as simple as changing a thermostat or a clogged radiator. Did you overheat the engine by running it without coolant? If so, you may have warped or cracked something and combustion or exhaust pressure from the engine is leaking over into the cooling system causing the hoses to burst. This is just a shot in the dark, I hope this helps. I would say to get more concise advice from another FixYa Expert or go see a mechanic.

Posted on Sep 27, 2010


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My 1999 dodge caravan is still overheating. I have already replaced the thermostat and the water pump, also there is no heat. please help me someone!

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.

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I have a 1992 Chevy caprice how do I flush the radiator

Remove hoses and use garden hose to run water through both tubes then reverse the flow and flush some more. If that won't clear the debris then replacement will be necessary

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Where is the blend door actuator location on a 2000 s10?

hello! i have a 2001 s10 zr2 i had no heat too!

turn out to be a clogged heater core !! to access mixing door should be behind the glove box!! getting back to heater core i back flushed heater core using garden hose ! when you put garden hose on alternate back & forth a lot of crap came out ! works great now! if your using that gm antifreeze is the worst !!!!! flush your engine & radiator refill with regular antifreeze it also clogged my radiator too ! my i had to replace the radiator! my radiator has engine oil cooler too!! Big $$$!!!

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Check gauges and temp. rises

More than likely sounds like your heater core is bad or clogged, easy thing to do is have it backed flushed, also you may need to burp you cooling system it may have a air pocket due to the radiator change

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98 expedition 9heater blows ice cold air. blend door replaced,heater core and radiator flushed. i think the

heater hoses clogged up, check where heater hoses connect to engine for clogs. Rust and corrosion love to build up in these locations.

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Hot heat at idle cool when driving

is there a chance that one of your heater hoses are clogged? or where they connect to the engine are clogged still? sounds like a clogged system. Cracked heater housing? Outside air bypassing the heater coil while driving?

Dec 13, 2013 | 2004 Pontiac Grand Prix

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The van temp is fine but the heater blows cold air

Make sure your heater hoses are there and hooked up. Make sure there is water flowing through the heater core.
Make sure the actuator is actually turning the heater on
and - under the hood too - make sure there is no 'heater hose shut off' that is either off or failing.

Good luck

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Driving on interstate and car started running hot. Heater was working and blowing hot air. Had steam coming from under hood. Top Radiator hose was hot but bottom hose was cool. Could it be a blown heater...

it seems as if there is a clog in the radiator, flush out coolant system and see if this helps.usually when top hose is hot and bottom hose is cold there is a clog somewhere in system. check radiator and make sure coolant is circulating. hope this helps carl,

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My heater is blowing out cold air in my 2005 impala

I can suggest three things that will normally fix this.

They are:
1. Fluid level
2. Clogged Heater Core
3. Bad Thermostat

Section 1. Fluid Level
First, check the fluid level in the radiator (not the expansion/overflow tank) when the car is cold.

You will need to remove the radiator cap (push down and turn), as I say, when the car is cold so you don't get burned. If low, start the car with the cap off, turn on the heater and top off the radiator with antifreeze when cold then again after the car gets up to normal operating temperature. The thermostat will normally be open to the heater core at that time. Top off the radiator with the car running (since you have the cap off there will be no pressure build up so this is safe to do).

Recap the radiator making sure it is all the way on (push down and turn) and check your heater.

If no heat, feel the rubber hoses that go into your heater core. These are typically on the firewall and close together. Feel both hoses.

If one is hot and the other is cold, do the steps in section 2. If neither one is hot, skip to section 3.

Section 2. Clogged heater core

With one hose hot and the other cold... you have a clogged heater core (a small "radiator" inside the heater). One way to fix this is to back-flow the heater core. This can be done without removing the heater core with a garden hose. To do this, remember which heater hose is cold.

Remove both hoses that go to the heater core at the firewall, you will then have two metal pipes that come out of the firewall. Take a garden hose and force water into the "cold" water pipe. Sometimes you will need to get another hose that is slightly smaller than the pipe at an auto parts store or, cut the end off the garden hose to get some good water pressure into the heaters core from the garden hose. This will force water in the reverse direction it normally flows and blow out gunk that probably has collected inside it.

If nothing comes out (really clogged), you will need to replace the heater core or take it to a radiator shop to be cleaned and reconditioned.

You may want to flush the whole cooling system as well because that gunk came from somewhere.

Section 3. Bad thermostat

If neither heater hose is hot... you probably have a bad thermostat and this should be replaced. You can normally find this by tracing the top, large main radiator hose to where it connects to the engine block. The thermostat is normally inside where this large hose connects to the block. (make sure to use a new gasket and silicone to seal it).

Good luck and stay warm this winter! -Dan

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3 Answers

Heater blows out cold air when on the warm setting ,possibly a plugged heater core

yes this is very likely the problem, have you check your cooling system is it rusty? if so the heater core is plugged, take the inlet and outlet hoses off the core at firewall and use a garden hose to clear it, then have the cooling system flushed if rusty.

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