Question about 1993 Mercury Grand Marquis

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Can't get any heat

The heater core was changed and thermostat also but no heat

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The only thing left to check is the rad see if it is blocked somewhere get it flushed out

Posted on Dec 10, 2008

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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

1 Answer

98 ford ranger no heat have changed thermostat water pump heater control valve


Maybe the heater core is plugged or you haven't bled it properly?
If the heater hose returning from the core to the water pump is NOT hot, while the hose going to the heater core from the thermostat area IS hot, then the heater core is plugged probably.
You need to remove the heater hose while cool,from the thermostat area and remove the hose from the water pump area (that's the outlet of the flow thru heater core) AND THEN take a garden hose with p-is-tol grip type sprayer,and blow water back thru the outlet hose out the inlet hose. This will blow any bad plugging material out the way it got in.
Don't apply too much pressure if it is plugged bad. The heater core isn't made to stand 50lbs. water pressure. don-ohio (:^)

Dec 31, 2016 | 1998 Ford Ranger

2 Answers

I changed the thermostat but it still does not heat up what else could be wrong


Heater needs Heater Core, Heater control valve, air diverter inside the car and hot water in the heater core. If you just change the thermostat you must have had a reason. If the car was running hot it could be a radiator clog. If the core is clogged no heat. If the heater core was drained when you changed the Tstat there may be air in it - if so no heat. If the control valve (on the heater hose) does not shift- no heat. If the diverter door in under the dash does not direct the fan air through the heater core- no heat.

Jan 03, 2016 | Cars & Trucks

1 Answer

How to change thermostat in a 2003 ford windstar


Is the problem the thermostat, or is the heater control blend door not diverting the blower air across the heater core....or is the heater core clogged? The thermostat is actually the least likely cause of cool air in the passenger compartment.

Oct 17, 2014 | 2003 Ford Windstar

1 Answer

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

1 Answer

Fan is blowing but no heat is coming out


check the heater core and change the thermostat

if the car is over heating then the heater core is bad if not then it is definitely the thermostat

if it still continues then check the heat control panel

Dec 05, 2010 | 2005 Mitsubishi Galant

2 Answers

My heat works on the passenger side and not the drive i've changed the thermostat and still the problem hasn't changed


If you have good heat on one side, it can't possibly be the the thermostat. Good heat on one side means that there is plenty of hot water (water and antifreeze mix) circulating through your heater core. The thermostat controls the temperature of the water. If you have hot water, the thermostat is not at fault. Your Impala is equipped with what is called "zoned climate control". All the inside air (both sides) is still heated by the same heater core. The difference between a "zoned" system and a conventional system is that there is more than one "blend-air" door insided your HVAC housing. The blend-air door swings back and forth to direct the incoming air either through the heater core (for hot air) or around the heater core (for cold air) The drivers blend-air door may be broken or the motor that moves the blend-air door is malfunctioning.

Oct 10, 2009 | 2005 Chevrolet Impala

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