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Heater is not getting hot whats the problem - Cars & Trucks

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Thermostat could be bad, heater core could be bad, blower motor could be bad. See if the blower motor turns on (passenger side under the dash). if it does then i would replace the thermostat. depending on how old the vehicle is you may want to have it flushed, something could be backed up. the last resort is the heater core because that is really involved and timely. it involves (in most cars) taking the entire dashboard out. for a feel, years ago it took me around 8 hrs just to get the the heater core in my chevy beretta. good luck

Posted on Dec 03, 2012

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Posted on Jan 02, 2017

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I changed thermostat on 2005 buick rendevous ultra 3.6l. still have no heat. whats next?


Was lack of heat in the cabin the only reason you changed the thermostat? Were the radiator hoses hot (or very warm) to the touch before you changed the thermostat? Were the heater hoses hot before you changed the thermostat? Did you get a check engine light and code stating that the engine was not getting (or slow getting) to operating temperature?
Getting heat from your heater depends on a blend door actuator letting air flow through the heater core in the HVAC unit. If your radiator hoses are hot, your heater hoses are hot, and you have no trouble code indicating the engine is not getting to operating temperature, but you are not getting heat inside the car, you need to check your blend door actuator or the control unit for the heater.

Jan 08, 2017 | 2005 Buick Rendezvous AWD

2 Answers

Mt car blows cold air but not hot i replace the thermostat and added antifreeze but it still no hot air its for a Mitsubishi lancer 2003


there are two hoses than run through the firewall to the heater core. With the car fully warmed up those two hoses should be about the same temp. If one is hot and one is significantly cooler that the heater core is likely plugged. The hoses can be removed and the heater core can be backflushed with a garden hose. do this several times alternating between the inlet and outlet of the heater core. reconnect the hoses and see what happens. Worse case scenerio you'll need to replace the heater core.

Nov 29, 2015 | Mitsubishi Cars & Trucks

1 Answer

Heater not getting hot enough


What is year--make--model? Does the engine temp reach normal operating temp? Do your heater hoses get hot? Is the heater core itself hot? If all that checks out, I'd have to check temp doors under the dash.

Do you live in an extremely cold region?

Nov 25, 2015 | Cars & Trucks

1 Answer

Have heat but not hot new thermostat new hoses flushed complete system and now gets warm but not hot


could have air lock or heater core plugging up. heater cores should be back flushed.when car is hot touch one heater hose at a time both should be fairly hot if both hot then the problem is temp control.

Jan 27, 2015 | Cars & Trucks

1 Answer

Heater doesn't get hot


have the coolant system pressure bled to remove all the air out of the system and remove the air lock preventing hot water from getting to the heater core

Dec 01, 2013 | 1990 Chevrolet Lumina

1 Answer

Heater hoses do not get hot.Have replaced thermostate and still do not get heat inside the cab,What can I do?


Try this trick take the hoses off the heater core and flush it out with a water hose to get the airout the heater core.don't do it with the car running.goodluck

Dec 04, 2011 | Cars & Trucks

1 Answer

What if the heater hose going in is hot and the heater hose coming out is cold.the heater will blow cold air


Possibly the heater core is 90% blocked. open enough to draw hot water in, (hose feels hot) but not enough volume to provide heat from very cold air, 10% hot water gets cold quick, coming from core..
Flush heater core in reverse direction - cold side in hot side out..

Just a theory..

Dec 14, 2010 | 2000 Chevrolet Silverado

1 Answer

My car wont get hot. got new thermostat and water pump


FIRST THE ONLY REASON FOR A THERMOSTAT IS TO GET HEAT INSIDE THE CAR SO WHAT YOU NEED TO CHECK IS THE HEATER HOSES GOING INTO THE HEATER CORE AND SEE IF EITHER ONE IS HOT IF ONE IS HOT AND THE OTHER ONE COLD OR WARN THEN THE HEATER CORE IS PLUGED IF BOTH ARE HOT THEN YOU HAVE A PROBLEM WITH A VENT DOOR IN THE HEATER BOX

Oct 19, 2010 | 2004 Chevrolet Impala

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

Changed the blower motor in 1985 wagoneer still dont get any heat, the heater core is still good, what else could it be??


What does the temp gauge read? 180-190 is ok if not change the thermostat,if ok is heater core lines both hot? if yes then heater core is good if not and one is cooler then core is plugged flush it out,if all that is good the air handler door are vaccum operated if there is no vaccum then all air in stuck on defrost and if not this then the hot air is getting cooled by cold air either from a broken heater box or the heater control for hot and cold is bad.

Mar 09, 2009 | 1985 Jeep Grand Wagoneer

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