Question about 1995 Buick Regal
3800 engine, car runs ok, heater fan works, engine gets to opporating temperature, but no heat in cabin.
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
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
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Posted on Dec 06, 2009
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
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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