Question about 2001 Chevrolet Blazer

1 Answer

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

Posted by on


1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points


    An expert that got 10 achievements.


    An expert that got 5 achievements.

    Vice President:

    An expert whose answer got voted for 100 times.

  • Master
  • 677 Answers

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

Posted on Feb 02, 2010


1 Suggested Answer

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

A 6ya expert can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
The service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
Good luck!

Posted on Jan 02, 2017


Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

4 Answers

Heater problems

Changing the thermostat was a good start.
Your issue might be a clogged heater core:
You need to warm up the engine again and turn on your heater. If it feels cold, then lift your hood and look for your heater hoses. There should be two small hoses going from the engine to the firewall on the passenger side. BEING CAREFUL, feel the hoses for being hot. You just need to touch the hoses and see if it feel warm to hot. If only one hose feel warm or hot and the other hose does not, you have a clogged heater core in the dash. If both hoses fell hot, you have a failure under the dash. The most common failure of the heater is the air mixer door on the heater/air conditioning assembly under and inside the dash. The mixer door has a tendency to tear up the fiberglass assembly that holds the door.
If it is not the core or the mix door ... then some people have had issues with the controls (at least on the same year Grand Am) ... see link
2003 grand am heater gets cold then hot then cold
Good luck on your troubleshooting!

Jan 24, 2018 | Pontiac Cars & Trucks

2 Answers

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

1 Answer

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 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

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

2 Answers

1988 Cadillac Sedan Deville has no heat. It blows cool air but becomes lukewarm after running quite a while. I have put in a new radiator, new thermostat, whole system has been power flushed and still...

Touch both heater hoses going to the heater core. They should both be hot. If they are, then the problem is probably a broken or binding blend door or bad blend door actuator. If one hose is hot and the other cold, then the heater core is clogged.

Jan 16, 2018 | 1988 Cadillac Sedan DeVille

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

Not finding what you are looking for?
2001 Chevrolet Blazer Logo

228 people viewed this question

Ask a Question

Usually answered in minutes!

Top Chevrolet Experts


Level 3 Expert

79186 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22326 Answers

Ronny Bennett Sr.
Ronny Bennett Sr.

Level 3 Expert

6927 Answers

Are you a Chevrolet Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides