Question about 1994 Chevrolet C1500

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I attempted a heater core replace on a 1994 c1500 and the a/c-heat(cold to hot) read out fills the space from C---to-----H and flashes multiple arrow indicators from C----H, then goes off completely. What could it be?

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3 Answers

Could the thermostat cause the heater to only blow cold air even though the motor runs normal temp on a 2003 dodge caravan


1st of all, you need to check your anti-freeze level. If its not full, the coolant cannot/will not flow throughout your heater core which the coolant flow through to heat your vehicle. If it is indeed up to the proper level? Than, yes I would look into the thremostat. It may not be opening up.

Jan 13, 2012 | 2003 Dodge Caravan

1 Answer

I have a 96 C1500 5.7 Chevy, I changed the heater core but i don't get any hot air through the vents, only cold air. I checked both hoes going to the heater core and they are hot. i also hear like b


this sounds like one of your electrical door actuator modules is not working not letting air flow threw your heater core itself in the heater box assembly feel at the bottom of your heater box for a heat from the heater core if it is hot then the problem is misdirected airflow. If the door actuator works it might be the hand control that you

Nov 18, 2011 | 1996 Chevrolet C1500

1 Answer

I replaced the heater core. After fillling the coolant I bled all the air out that I could thru the bleeder screw at the thermostat housing. However I had no heat. Pulled the cover back off and the core...


some cars like cavalier and sunbirds grand am
were the rad is lower then the motor or heater core
needs to be vacumed fill to get all the air out
otherwise very little heat in heater system even if engine temp
runs up

Mar 31, 2011 | Pontiac 6000 Cars & Trucks

1 Answer

1994 silverado heat is not working. Replaced thermastat, heater core and checked fuses. Still no heat. The blower motor (high, med, low, is working fine.


I think that one still uses cables to control the blend doors and vent doors. Are you sure those are working and/or connected.

Also when you replaced the thermostat and heater core did you bleed the cooling system? With the engine cold remove the radiator cap and let engine idle up to operating temp while keeping the radiator topped off with coolant.

Are the hoses going to the heater core hot?

Dec 06, 2010 | 1994 Chevrolet Silverado 2500

2 Answers

1994 C-1500 V8 - no heat


something wrong with clima control ,check the thin plastic pipes have a vacumn in them ??if all else fails wedge the flap open as tis so dammed cold evan here in spain.

Jan 28, 2009 | 1994 Chevrolet C1500

1 Answer

Does not blow hot air (heat)


The heater in your car depends upon a flow of hot coolant going through the heater core in order to get hot air into the car. If the heater core is partially plugged, it will restrict the flow. If you have a head gasket that is putting exhaust into the cooling system, it will eventually get into the heater core. When this happens there is no coolant in the heater core to make the air warm. If the water pump vanes have corroded away the result will be very poor coolant circulation causing the heater to not blow hot air. If your car is equipped with a heater control valve that is not functioning properly, the coolant flow will be restricted. One or a combination of these factors is likely the culprit in your case.

To attempt to clean the core, you must flush the system multiple times. If this does not work, the core cannot be cleaned and must be replaced.

Jan 16, 2009 | 1995 Jeep Grand Cherokee

2 Answers

2000 Vw passat,had no heat.


The heater in your car depends upon a flow of hot coolant going through the heater core in order to get hot air into the car. If the heater core is partially plugged, it will restrict the flow. If you have a head gasket that is putting exhaust into the cooling system, it will eventually get into the heater core. When this happens there is no coolant in the heater core to make the air warm. If the water pump vanes have corroded away the result will be very poor coolant circulation causing the heater to not blow hot air. If your car is equipped with a heater control valve that is not functioning properly, the coolant flow will be restricted. One or a combination of these factors is likely the culprit in your case.

To attempt to clean the core, you must flush the system multiple times. If it is still problematic, changing it is your only remaining option besides the water pump itself.

Jan 15, 2009 | 2000 Volkswagen Passat 4Motion

2 Answers

No heat. Temp gauge barely moves, but hoses to/from core are hot


If the temp. gauge on the instrument panel is OK, test and eventually replace the temperature sender, and check the wiring to temperature sender.

Replacing the whole heater core is not a simple operation, test sender and wiring first.

Jan 02, 2009 | 1994 Mercury Tracer

1 Answer

1994 Taurus heat control problem


First check to see if the water to the heater core is hot. if not then you need ti check the hot cold vale . it is an electric valve that opens to let the hot water bvy.

Dec 05, 2008 | 1994 Ford Taurus

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