Question about 1995 Oldsmobile 88

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No heat from heater

Heater is set to hot but no heat

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  • Anonymous Nov 22, 2008

    replaced the control swicht,back flushed the system,put a new thermastate in and still no heat

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U either have vacuum leak on the lines running from ur climate control that directs air over the heater core or the climate control its but my guess its ur lines come off or crack its one those probs seeing it is easier to figure out

Posted on Apr 11, 2009

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No heat pressure out of vents on hot setting,but blows really hard on cold setting...does blow heat just not hard enogh,good heater core and full of coolant


may be something plugging the heater tube itself, maybe a rodent has set up camp, fan resister works both cold and heat fan speeds, unless they have a resister for cold and hot which I have not heard of.

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Heat control switch is bad if you turn it all the way cold and it still blows hot air.

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I have a 2000 jeep wrangler when I turn on the heat or defrost I can hear it running but I get no heat. What could cause this heater coil, thermastat or something else maybe?


Is coolant level full? To check if the heater core is circulating coolant, feel both heater hoses where they enter the firewall-both should be hot when car is at normal operating temperature. If only one is hot, look for a heater valve in the heater line-make sure it is open so the heater core circulates. Not all vehicles have such a valve, in fact, I think most don't have the valve, but you could check. The valve may be cable operated or vacuum operated to open and close. If no valve, and one hose is cold, there may be an air block in the heater core. Crack a line loose to get coolant circulating.
If both hoses are hot, it is probably the doors in the heater case not operating properly. Watch the door actuators when you move heat from cold to hot, and when moving from defrost to another setting. The temperature blend door is probably on the passenger side of heater case. These doors may be cable operated, vacuum operated, or electrical motor operated. If you watch for their operation, you might see or hear the problem with them not opening or closing properly.
Good luck.
If both heater hoses are hot

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2003 f350 diesel no heat


thermostat is sticking open

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What could cause my truck to have no heat?


the heater radiator could be blocked or the valve controlling the heater could be faulty ,,,, carefully check the heater hoses ,, they are the small ones running from the engine bay through the bulkhead into the car,,,they both should be hot ,,, if one is cold the water is not circulating either due to a blockage or the heater valve not working ,,, if the car has climate control you need to be sure that it is serviced properly as this system mixes the hot and cold air,, also at 210 you should have some heat , the best way to check if its the thermostat is to run the carstationary until it gets hot even if the thermostat is faulty the system will build up heat due to no cold air passing through the grill and coolng the engine radiator

Feb 11, 2012 | 2001 Chevrolet Silverado 1500

1 Answer

My engine temperature gauge reads hot but heating system is not working. Outside temperature is below zero


It is possible that somehow your heater core is either blocked or airlocked. Best thing to do is to feel the two hoses that go to and from the heater core when the engine is up to normal operating temperature. If one hose is hot and the other is barely warm than you have a blocked up heater core. If you feel both hoses and they are barely warm than it is possible that you have an airlock in the system. The airlock is mostly likely to occur if you have recently had your heating system worked on such as a new radiator, thermastat, etc. If both hoses are hot then it could possibly be the heater blend doors inside the heater box could be stuck in the cold position. They are controlled from the switches on the dash. When you adjust the heat setting on the dial from hot to cold or cold to hot it moves the blend doors to either let more cold air in or more heat in. Hope this was helpful. Happy motoring.

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1 Answer

Can a fuse effect the heat coming out or will it effect the heater from working,i have flow thru the heater core but wont get warm .blower works great .anything else i can check ,also brand new thermostat


Make sure there is no air trapped in the heater core. With the radiator cap removed run the vehicle at idle until it reaches full operating temp while keeping an eye on the coolant level in the radiator and topping off as necessary. When the thermostat opens rev the engine a couple times. Short snaps work the best. Do this from the drivers seat while the heat is set to full hot, the mode is set to vent, and the blower speed is set to low or the next setting higher than low. If you feel short bursts of hot air there is restricted flow or air in the heater core. Continuing trying the short burst for about 5 minutes (a couple short bursts and than wait and then a couple more). If it doesn't stay hot its restricted.

I think the blend doors and mode doors are vacuum operated on that one. Make sure you can hear a noticeable difference in the sound of the air as you switch from full cold to full hot. If you don't than the blend door, blend door actuator, or the heat selector switch could be bad.

If you do hear a noticeable difference than I would suspect a plugged heater core. Especially if the first part above did not work and the coolant is muddy or nasty looking. You can try back flushing the heater core by removing the heater hoses from the heater core. Then using a garden hose spray water into one side of the heater core tube until clear water comes out. Then do the some thing on the other heater core tube. This may take several tries but you should start to notice an increase in heat. top off with straight coolant (not mixed 50/50 with water) to compensate for the water in the heater core.

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2 Answers

2001 F250 super duty 5.4 has very little heat. changed thermostat, checked blend door and other diverter doors. all are working. blew the dust from the heater core. still the air is luke warm. anyone have...


You should have a heater control valve in one of the heater hoses. Check that when you set the controls all the way up hot that the valve is opening the whole way to allow hot coolant to run thru the heater core. If the valve is working and allows flow, you may have to take it out to check it. Then the problem will be the heater core is most likely clogged and needs cleaned out or replaced.

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1 Answer

Rear heater not getting hot after by-passing front heater core which is leaking.


Hi:
Your vehicle only has one set of connections to the heating system, and you disconnected them when you bypassed the heater core. There is not a seperate heater core for the rear heat, just ducts off of the front heat.

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1 Answer

Ford Windstar SE, 3.8L V6, 1999, front seat heat/defrost is cold


the blendor actuators strip out the gear inside the actuator cases on these all the time. replace the actuator.

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