Question about 1991 Chevrolet C1500

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Heater want get hot

Heater wont get hot. changed thermostat ,heaterhoses the engine get up to normal temp it just dont get hot inside the cab

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  • campcrell Dec 03, 2008

    What controls the water going to the heater core, and where is it? Is it controled by wire or vacume? Thanks

  • Anonymous Dec 07, 2008

    where is the hot and cold switch located in the engine

  • Anonymous Dec 07, 2008

    It blows cold air and have changed thermastat.The hoses going to heater core are hot.

  • jamesballou Dec 23, 2008

    My heater does not heat up but the A/C works great and the hoses to the heater core at normal temp

  • Anonymous Jan 22, 2009

    need to change thermosstat in a 2002 venture. Where is it located

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Heat exchanger not working look under dash find where cable goes from heater controls the hot and cold switch move back and forth to find it its not opening all the way when you move it to hot push it farther by hand this will open the airway for your heater core

Posted on Nov 26, 2008

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Both heaterhoses stay cold even if the engine hs been runing and heater was set on max nd high


Check for a stuck thermostat. Housing is usually on the engine block where the heater hose to the radiator connects. Replace the thermostat and hot water should start flowing.

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verify heat is in normal range using dash gauge. if its normal then good. if it is below normal, you may have a sticking open thermostat not allowing heat to build up enough for "hot" heat. but usually luke warm heat will be this issue.

If everything is fine with gauge heat, check the hoses going to your heater core with your hands. they BOTH should be hot. If one is hot and another is warm then you have heater core issues. If both are HOT then you may want to check your temp controls. either temp control may not be working or the door that changes temp may be stuck in the cold position... there are many things, but checking the heater core hoses are most likely going to reveal bad heater core.

You will need wiring diagrams and volt meter to diagnose anything other than touching hoses and looking at gauge.

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heater core cloged, get car hot check heaterhose going into heatercore should be two inch thick hoses going into the heatercore, underhood against firewall pasenger side, after hot while running heater on, chech to see if both hoses r hot, if one is cold,that means there is a restriction in the heatercore, sometimes on older cars there is a external valve run by a vaccume hose, or cable, thats fixed in with the heater hoses , sometimes this valve jams and can be manually switched.

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once the truck is fully warmed up, feel the 2 heater hoses going through the firewall in the engine compartment. they should be hot to the touch. if they are, then the problem is most likely the heater controls, such as the temp. switch on the dash or the blend door itself inside the dash. if they are cool, check that the coolant is completely full. just because the temp gauge reads normal doesn't mean there's enough coolant in the system to fill the heater core. remove the radiator cap once cooled and top off if needed. if it is, or was, low, its possible to get air the the cooling system and block flow of coolant to heater core.

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1 Answer

Tempeture guage not working and heater is blowing out very little hot air on my ford galaxy


you need to get the thermostat changed. The thermostat controls how much coolant runs around the engine and sends signals to your temp gauge to indicate how hot the engine is.
if the thermostat is faulty it wont sent signals to the temp gauge and wont open up to allow coolant to run around the system. Your heating is run by coolant, behind the dash there is the heater matrix hot coolant runs into the matrix which gets blown inside the cab.
Fitting a new thermostat will fix all the heating and gauge problems. if your technical minded you can buy a thermostat from an autofactor (or ford, but they are expensive from ford). a garage will charge about £30-£100 ish for a new one.

hope this helps :-)

Feb 10, 2010 | 2001 Ford Excursion

1 Answer

My 1998 dodge ram 1500 heater wont blow hot air I replaced water pump ,thermostat and radiator blower works fine just no heat.


check to see if both heater hoses are same temp when engine is at normal running temp if not heater core not flowing coolant may need to flush also make sure it does reach normal temp around 200

Jan 31, 2010 | 1998 Dodge Ram 1500 4WD

1 Answer

2002 dodge 1500 Changed radiator, thermostat, and hoses. No heat


Why was radiator replaced?Did it have heat before ? If it was plugged, the heater core may also be plugged. Try flushing it with a water hose in both directions. I dont know why the botton radiator hose would be cold, the radiator should be a uniform temp and the air coming through the radiator should be HOT, when the engine is at operating temp. What condition was the old coolant? if it was rusty, the water pump may have lower flow than normal.

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Frontier 2000 2.4L King Cab 100K miles. Temp guage indicates overheating. Will intermittently spike then drop to normal. Engine does not "smell" hot or run rough at any time. Grab upper hose, you can...


I've had problems with Datsun (later Nissan) engines hanging the closed thermostat until it boiled, then the thermostat released and operated normally. If you increase the small vent hole in the thermostat valve plate a small amount, the problem disappears. It seems that steam from engine operation gathers behind the thermostat sensing bulb and delays opening. The increase in vent hole size lets the steam through and allows the hot water to open the valve. Hope this helps!

Oct 12, 2009 | 2000 Nissan Frontier

1 Answer

Inside heater temp


some where on the heater lines or by the heater core there should be a gate valve. However is your heater fan fluctuating ( blower motor ) with your R.P.M.s ? if so then check the tension on your altenator belt.

Oct 21, 2008 | 2002 Chevrolet Blazer

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