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No heat. Changed thermostat still no heat. Plenty of fluid, heater hoses are warm. Please help

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Check blend door in heater compartment

Posted on Mar 31, 2011

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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

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Heater not working


Get a higher temperature thermostat. Fluid in the block warms up first and hotter then mixes with cold radiator fluid this lets it warm faster. Your current thermostat is opening too soon preventing it from warming the whole coolant system,also put a piece of cardboard across the grill to keep the radiator warmer.

Jan 02, 2015 | 1991 GMC Sonoma

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98 grand cherokee little heat.heater hoses hot top rad warm bottom is cold collant barely luke warm


While it doesn't seem likely, if you've changed, or had the thermostat changed.... I'd say you got a faulty thermostat. I am curious as to what your temperature gauge says the temperature of the engine and coolant is.. If your gauge is showing hot, I can think of two more possibilities... the water pump isn't pumping right... and, if the water pump isn't working right, the problem can be a cracked head or block, which can cause an airlock in the coolant system. Check the coolant or radiator cap.

Nov 14, 2013 | 1998 Jeep Grand Cherokee

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My 1984 grand marquis does not get heat


did everything said to do put new heater core in and a new thermostat instill no heat

Oct 08, 2012 | 1984 Mercury Grand Marquis

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My engine takes forever to warm up so that I can turn my heater on. Then, even when the engine has warmed up my heater never blows hot air, just barely warm. I have a new radiator system and plenty of...


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

Jan 17, 2011 | 1999 Jeep Cherokee

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No heat , replaced radiator , water pump, rad. cap , hoses and flushed system twice.blows cool air.whats left?


Thermostat.? if you haven't? Do it first then try it. While the car is running for a while touch the heater hoses that lead to the firewall. if one is cold and one is hot? You have a blocked Heater core. Follow the hoses back to the engine. Unconnect them both. By using a garden hose flush out the heater core do one side and then reverse by doing the other hose Lots of junk will come out so be care ful. Mistake people make is "Flushing the system" That doesn't mean your flushing the heater core.
Seeing that you have done everything else it could be the thermostat which you didn't list or the heater core being clogged. When you finished installing the thermostat and flushing the heater core out. Replenish the coolant system . If you have a bleeder on the thermostat housing? use it . loosen it and top off the fluid until you see fluid comeout of the bleeder. The system being air bound would cause no heat..

Jan 10, 2011 | 2000 Buick LeSabre

1 Answer

I have a 98 cavalier and i just changed the thermostat , took it for a test drive and she over heats in 1 km . fluid is up hoses are warm no heat from the heater core.


you have an air pocket you will have to berp the system, or you can get it warm and then take the radiator cap off and shut vehicle off let it cool completely down and put more water in until full. an air pocket causes the water to not circulate and it will run hot and have no heater.

Jan 25, 2010 | 1998 Chevrolet Cavalier

1 Answer

94 dodge intrepid blows kinda warm but not very warm what do I do? We changed the thermostat


Since your blower is working and it is a heat issue,thats where we'll start,First thing is have you checked the coolant level in the radiator when engine is cold,make sure it is filled to top,next verify you have coolant in reserve ,Start your van and get it up to normal operation temperature,If your heat gauge on the dash works correctly it should be 190 degrees,Now lift the hood and locate the two heater hoses going into the heater assembly at the fire wall,Both hoses should be hot to hold on to,if both are hot and no heat inside your problem will be the blend air door in heater assembly.
if neither hose is that hot you need to replace the thermostat in the engine to get it up to 195 degrees.
if one hose is hot and one is luke warm then the heater core is blocked and to blame. hope this helps you.

Jan 08, 2010 | 1998 Dodge Intrepid

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My 2005 malibu is taking a long time for me to get heat and it also seems that if I put it on max less heat comes out, could it be the thermostat or the coolant there is plenty of coolant in the reservoire...


follow the upper rad hose back to the motor there you will find the thermostat at the end onf the hose

if you go t the deaLer they will usually show you the location and sell you the gasket and thermostat

Jan 02, 2010 | 2005 Chevrolet Malibu

1 Answer

Heater blows cold air


With the car warmed up,feel the heater hoses,are they both warm/hot near the firewall in the engine compartment?If they are both warm/hot,then the heater core should have circulation through it and it may be a "blend door" issue in the heater a/c assembly.If they are not warm/hot then the heater core could be dirty and plugged up and needs to be flushed.
If the above does not help,a drain and vacuum of the cooling system and vacuum refill will remove any trapped air.
Sometimes,clamping off the top rad hose and holding the engine rpm at 2000 rpm will force trapped air out of the heater core.(Watch temp gauge when trying this)
Lastly,a NEW thermostat doesn't mean its working correctly.

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