Question about 1995 Buick Regal

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No Heat, fan works engine is at temp.

3800 engine, car runs ok, heater fan works, engine gets to opporating temperature, but no heat in cabin.

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  • Buick Master
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Check to see if both heater hoses are hot when the engine has heated up and the heater is running.

You have 2 possibilities. One is that water valve is not opening and the heater core is cold, the second possibility is that the heater core is hot and the ductwork under the dash is not switching the flaps to give heat.

If both heater hoses are hot it means the heater core is hot and the interior ductwork is not channeling heat. You would then need to replace a movement valve or motor to switch the flaps in the ductwork.

Sometimes with the high priced options, there are self-diagnostics in the control panel of the heater. You would need someone to initiate the sequence and let the self-diagnostics pinpoint the bad part. Otherwise you need to dive under the dash and troubleshoot.

Posted on Feb 12, 2012

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Posted on Jan 02, 2017

  • 3 Answers

SOURCE: 1986 buick lasabre heater fan workes, but no heat at all

could be a vacuum switch on the heater hose. The heater hoses are the small hoses ( 1inch, usually black or red) that run from the motor to the inside of the car. They should be warm when the car is up to temperature.

The vac switch controls the water flow to the heater core. If the vac valve is bad or the vac line that feeds it is bad it will not allow water to enter the heater core.

Could be a plugged heater core too.

Check the water level in the radiator as well. If the engine is low on water often the first to go is the heater.

Posted on Dec 20, 2008

Mustgo
  • 2359 Answers

SOURCE: 95 park ave. low heat on temp guage and no heat

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Posted on Dec 06, 2009

  • 19 Answers

SOURCE: No Heat - Electronic comfort system - Temp indicator flashes

something on the inside is resticting the air flow possibly paper!

Posted on Jan 15, 2009

alicantecoli
  • 22095 Answers

SOURCE: fan will not come on when heat is turned on.

needs a new blower motor /reostat unit or the if fitted the computerised control panel ,or if climatic control their could be a box behind dash ,but i honestly have never worked on one so i would not know the layout or system used

Posted on Jan 08, 2010

  • 3640 Answers

SOURCE: heater will not keep heating

first of all. check coolant level. if this is ok you may want to change thermostat if you still have problem. also make sure coolant is circulating in system and the water pump is ok. or you have a bad coolant leak!!

Posted on Jan 09, 2011

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Thermostat stuck open?
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1-your thermostate is stuck open half way. thermostate is a simple device that made of enlarging metals when heat is applied. it suposed to be in close position to allow engine heat up, when specified temp reached it opens and let it flow and radiator tries to keep coolant cool.when it is broken it stucks or it acts slow or it wont acts at all. in your situation it is stuck open half way. it allows enough water to be heated but flow is limited to heat cabin heater.

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The overheating and lack of cabin heat both point to a failed engine thermostat which would be stuck closed. At the warm up stage, the coolant stays in the engine block to bring the engine to efficient operating temperature, then it opens and circulates the coolant through the radiator and heat core. If the thermostat is stuck closed, the engine will overheat, and coolant will never reach the heater core, and you will not get cabin heat.

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The heater core being clogged would affect whether the interior gets hot air when set to hot temperature.

The heater core is like a very small radiator that wouldn't affect the temperature of the engine very much.

May I ask how hot it gets? Engines can get to 220 deg. F or 230 deg. F and still be considered to be running in a normal temperature range.

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Your car's heater is a life saver in cold weather. Before attempting to repair your car?s heater, you should understand how your car?s heater system works. First, on this page is an explanation of how your car?s heater system functions, further down the page are some pointers on heater system trouble-shooting. To warm the passenger cabin of your car, your car?s heating system makes use of excess heat from the engine?s internal combustion process. A car?s engine, in fact, when in operation produces so much excess heat that if the excess heat is not removed, it would destroy the engine. It is your car?s cooling system that removes that dangerous excess heat. Some of an engine?s excess heat is released through the exhaust. Most of an engine?s excess heat is absorbed by a circulating liquid coolant, which is a mix of water and antifreeze. The heated liquid coolant is carried from the engine through hoses to the radiator, which transfers the heat from the coolant to the outside air. That heat transfer lowers the temperature of the liquid coolant, which is then circulated back to the engine to absorb excess heat again. Whereas the radiator is located at your car?s front grill, the unit that transfers heat to the passenger cabin is located inside the dashboard. This unit is something of a mini-radiator and is referred to as the heater core. Heated liquid coolant circulates through tubes in the heater core and a heater fan blowing across those tubes, as well as through little fins encasing the tubes, directs warm air through heating vents into your car?s passenger cabin. Because your car?s heating system works off of its cooling system, heating system malfunctions are often caused by problems in the cooling system.

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