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Blowing cold air engine overheating

2004 Blazer V-6 runs a little hot and heater takes a long time to warm up adequate fluid; changed thermostat yesterday: cannot feel top rad hose get 'full' and hot Please help Thanls

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  • 67 Answers

You will need to bleed the coolant system. There will be a bleed screw on the left hand side of the manifold. There is not enough coolant to flow through the heater core.

Posted on Mar 23, 2014

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Posted on Jan 02, 2017

  • 120 Answers

SOURCE: overheating

Yes, you re correct! thats a thermostat issue.

Posted on Dec 15, 2008

  • 10 Answers

SOURCE: 1994 gmc safari,no heat

sounds like a blend door problem gm uses plastic clips to hold actuator rods that tend to break easiest thing to do is take it to a shop that offers free heater checks. and let them check it out

Posted on Jan 16, 2009

  • 3 Answers

SOURCE: 04 civic heater blows cold air at idle

you should have hot water on all rad. hoses when the motor is running at a norm. temp. the water is not going through the heater core like it should. you have cutoff valve bad low water are a stopped heater.try a hoter thermostat if none of the above are true.

Posted on Jan 18, 2009

  • 42 Answers

SOURCE: HEATER Does not get hot only slightly warm

Ok. Here goes. 1. Start by making sure your thermostat is the correct one and that means the manufacturer suggested temp must be right. 2. You said the radiator is not stopped up. Good, or you should be overheating which will destroy motor. 3. Both top and bottom radiator hoses should get hot when stat opens and water pump circulates water. 4. Heater hoses can be removed and backflushed to check for circulation. 5. check inside valves for opening closing heater core. Some are mechanical and some are electronic that open and close off the heater core. 6. If your head gasket is blown or heads are warped due to excessive abuse or age of vehicle then you will have to decide to fix (not good idea on aluminum motors) or replace the motor or the car. 7. Had a relative who died of cancer and had me replace his stat two times thinking this would give him more heat in the car but the cancer is what caused his body temp to stay cold. Hope you do not have cancer.

Posted on Aug 12, 2010

  • 7 Answers

SOURCE: 99 chevy silverado heater doesn't blow hot air,

In addition to faulty actuator motors, the blend door itself can also be broken. This happened on my Tahoe. Typically it is a very labor intensive and costly fix to replace a broken blend door, as the dash must be removed and the plenum assembly replaced. There is a DIY kit from heatertreater.net that provides steel hardware as well as instructions on how to perform the repair by removing the glove box rather than the entire dash.
This is also an alternative to replacing the 'difficult to access' top actuator motor underneath the dash. The kit contains a single blend door which converts the dual control to single control, and is operated off of the bottom actuator motor, which can be accessed by removing the glovebox. If you are having issues with your blend door, or the 'top blend door actuator motor behind the dash' it is worth looking into.

Posted on Dec 14, 2011

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Heater not warming up


Most likely the thermostat broke. I expect that you have an older Hyundai and never had the anti-freeze changed. When the engine is cold the thermostat is closed which causes the engine to warm up more quickly. A warm engine runs more efficiently (less gas) and more smoothly. When the engine temp reaches a certain temp the thermostat opens and then allows the hot engine coolant to run through the lines to the heater core. The heater blows air over the heater core which produces the warm air that warms up the cabin. Thermostats used to be cheap and easy to change. I would suggest a web search for how to replace the thermostat. Something like 'hyundai accent 2002 replace thermostat".

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If both heater hoses are hot, you could have a blend door problem under the dash. If the engine is not warming up, check the thermostat.

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I have a 1989 s10 blazer 4.3.The temp guage reads 225 is this normal? I have replaced the waterpump,thermostat & belt.


For car running hot and overheating issues, I suggest to you go through this help links. Click this link below and go through the troubleshooting procedure to take care of the problems: ----Car runs hot? http://howtobyme.blogspot.com/2011/11/car-runs-hot-in-traffic.html
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http://technoanswers.blogspot.com/2011/11/all-types-of-car-overheating-problems.html
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http://howtobyme.blogspot.com/2011/11/engine-overheats-and-heater-blowing.html

---------------------------
Car overheats and Air blows hot at idle?
http://howtobyme.blogspot.com/2011/11/car-overheats-and-air-blows-hot-at-idle.html
--------overheating? http://schematicsdiagram.blogspot.com/2011/12/buick-century-overheating.html
----------Car engine Overheats and transmission starts slipping?http://schematicsdiagram.blogspot.com/2011/12/car-engine-overheats-and-transmission.html
----------This details will help.Thanks.

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1 Answer

I have a 2004 Dodge Stratus, the car could be cold and the temp reads right in the middle and the fan is on. When I drive it, the temp gauge goes to hot and the temp light goes on. Radiator is full,...


For car running hot and overheating issues, I suggest to you go through this help links. Click this link below and go through the troubleshooting procedure to take care of the problems: ----Car runs hot? http://howtobyme.blogspot.com/2011/11/car-runs-hot-in-traffic.html
-----------All types of car overheating problems and troubleshooting?

http://technoanswers.blogspot.com/2011/11/all-types-of-car-overheating-problems.html
Car freeze overnight and started overheating while driving?http://technoanswers.blogspot.com/2012/01/car-freeze-overnight-and-started.html-----------Engine Overheats and heater blowing cold?

http://howtobyme.blogspot.com/2011/11/engine-overheats-and-heater-blowing.html

---------------------------
Car overheats and Air blows hot at idle?
http://howtobyme.blogspot.com/2011/11/car-overheats-and-air-blows-hot-at-idle.html
--------overheating? http://schematicsdiagram.blogspot.com/2011/12/buick-century-overheating.html
----------Car engine Overheats and transmission starts slipping?http://schematicsdiagram.blogspot.com/2011/12/car-engine-overheats-and-transmission.html
----------This details will help.Thanks.

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is there a water inlet valve on one of the heater hoses? the valve is to regulate how much water goes in the heater core.

another possibility that happened to me is, the pink antifreeze (dex cool) slimmed up my heater core. i blew it out and my heat was back

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1 Answer

04 civic heater blows cold air at idle


you should have hot water on all rad. hoses when the motor is running at a norm. temp. the water is not going through the heater core like it should. you have cutoff valve bad low water are a stopped heater.try a hoter thermostat if none of the above are true.

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