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Both heater core hoses going into core is cold to touch engin is hot

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4.3 V6 ? Either you thermastat is not opening or you vacuum valve from your temp control is not.

Posted on Feb 02, 2010

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Posted on Jan 02, 2017

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2006 grand prix heater works eventually but takes a long time and it is only warm. once i turn the blower down it gets cold again?


First check to see that the heater hoses from the engine that go to the heater core under the hood get hot, they should be hot enough that you can't touch them for more than a few seconds. If they are cool to the touch the engine is not reaching proper operating temperature. if they are hot then the most common issue would be that the air temperature control blend door (controls airflow over the hot heater core and cold AC evaporator core) is not moving or is only moving a little, this means the dash must be removed from the car to access the defective blend door and its actuator motor.

Feb 02, 2017 | Cars & Trucks

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What all can make the heat stop working? Blower works but no Defrost an no heat.just. cold air. Changed thermostat changed lower rad.hose


The controls that let hot water flow through the heater core may not be working or the core is plugged stoping all water from entering. Easy way to test is with the engine up to operating temp, touch both hoses going to the heater. If one is colder than the other, the heater core is not getting enough hot water.

Jan 23, 2016 | Cars & Trucks

2 Answers

No heat or very little heat in a 2001 blazer and iv tried everything ...it will blow some heat then go cold


Bad coolant flow. check for low coolant, also a thermostat could be restricting proper coolant flow. If coolant is full in the radiator than touch your upper radiator hose to see if it is hot. If their is proper coolant level and engine is warmed up to temp and radiator hose is cold replace your thermostat.

Nov 02, 2014 | Cars & Trucks

1 Answer

2000 chevy silverado not blowing hot air


1: not enough liquid in the system (air in the heater core)
2: inoperative heater valve not allowing hot liquid into the core
3: hot/cold blend door in the heater box stuck on cold
4: clogged heater core
A clogged heater core will have one hot hose and one significantly cooler hose at the firewall connection; easily tested by hand. a good core will have both hoses very hot to the touch when the heater is on full blast.
Make sure that the system is full and at operating temperature, and the heater controls set on full heat. Feel the hoses at the firewall; if they are both too hot to touch then the problem is in the heater box or controls.

Mar 03, 2013 | Cars & Trucks

1 Answer

Celica vvti 140 52reg heater blows cold


once engine is hot
all cabin setting set to heat
check hoses going into cabin from engine - are they hot if not check - engine thermostat.
flush cabin heater core with water from garden hose - through both core hoses one direction then the other - to clean out core.
check vacuum doors in heater core box in passenger compartment.

Apr 14, 2011 | Toyota Celica Cars & Trucks

1 Answer

Heater not heating up... 1993 cellica


Hi there,

You need to figure out what's wrong by process of elimination. Locate the two heater hoses that come off the engine and go into the firewall (the wall behind the engine). These two hoses lead to your heater core (like a miniature radiator behind that wall). With the engine hot, feel the hoses (usually one on top and one beneath, on the left when you are facing the rear of the car) When the engine is hot, and both hoses are hot, that means your heater core is plugged(least likely). If that's the case you need someone to flush out the core, under pressure.

The most likely scenario is that one or both of the hoses are cold to touch. This means the thermostat is not working right and needs to be replaced. A bad thermostat will not open and make your engine run "cold" which will also kill your gas mileage. A good mechanic should be able to replace a thermostat without bankrupting you! This would be the best and easiest problem you could wish for.

Good luck...

Jan 16, 2011 | 1993 Toyota Celica

1 Answer

My heater in my blazer does not heat. the engin temp reads normal, and the fan runs but cold air comes out


Hello. this is normallyt caused by a restricted heater core. under the hood on the passenger side of engine you will see two heater hoses going to the firewall. feel these hoses, they should both be hot to the touch. if one is cold and the other is hot, the heater core is plugged up. sometimes you can back flush the heater core and get the heat to work again.

Dec 07, 2010 | 2000 Chevrolet Blazer

2 Answers

I have a 1998 e350 cargo van and the heater won't get hot. replaced the hot/cold button. cant find where the heater control valve goes. or if that is the problem. what should i try?


Check the heater hoses going into the heater core.Both of the hoses should be hot to touch,when the engine is at normal warm running conditions.If only one,or none of the two hoses are not hot,or very warm.then pull the heater hoses off,and use a water hose to flush the heater core out.Make sure the coolant level is full,if it is not,then the heater core will not get coolant flow threw it.

Oct 28, 2009 | Ford E-350 Cars & Trucks

1 Answer

Heater in car doesnot get warm at all 2004 Toyota Prado


Can you feel hoses going into firewall under hood and see if both hoses are hot to touch, just to see if the flow is getting to the heater core. They should be fairly hot to touch when engine at normal operating temperature & heater is on. If one is a fair bit cooler than the other, that is a sign of a clogged heater core. Let me know what you find, if you can get to them to feel. Careful at first in case real hot.

Jun 07, 2009 | 2004 Toyota Land Cruiser

1 Answer

Heater blows cold air.


heater cores clog in taurus. way to know is this--engine fully hot--heat on reach down to the fire wall and grab hold of one of the heater hoses where it hooks to the core--one should be real hard to keep hold of because its that hot. If the other is close to the same the core is not clogged. But if the other is cold to the touch its clogged. You can remove the hoses and shoot garden hose water in one side or the other and break it loose usually

Apr 07, 2009 | 2002 Ford Taurus

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