Question about 1999 Chevrolet Express

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No hot air im sure its the heater core.. how ever where is the back herater core???????

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Were your heater control panel is at the back of the truck(if you have controls in the rear of the truck)is where the heater core is behind the the cover and the hoses connect under the van to the heater core.i`m assuming this is an 8 passenger van with carpet and rear seats.

Posted on Mar 28, 2011


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Heater blowing cold air. I have checked coolant, flushed heater core and replaced actuator. still blowing cold air. Where do I go from here

The water in the radiator must be hot. The hot water must flow through the heater hose to and through the heater core and back to the cooling system. Blockage in the hoses or an inoperative valve will prevent the heating. You might try loosening the return hose to verify that the water is flowing into the heater core and back out. Try this before everything gets too hot or disconnect the input and output hoses and blow compressed air through the system to be sure there are no obstructions. All switches and levers must be set to heat, and all valves open to permit hot water flow. Good luck. Hope this helps a little.

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Check hoses to heater core to make sure BOTH are getting hot. If yes, bad blend air door or actuator likely. If no, back flush heater core or replace.

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The heater on my A6 1.8 petrol doesnt get warm just constantly blowing cold air,I've bled the cooling system recently had a new water pump and thermostat fitted and still no heat. the heater control unit...

There is a heater core valve on vehicles that have a dual zone, ( climate control ) systems. The valve is in the area of the heater core.

Something to try. allow the engine to run for 6 to 8 minutes with the heater wide open, then, turn the engine off and reach back and feel the 2 hoses at the firewall that lead to the heater core. If only 1 is hot you do have some blockage, if both are hot then it is circulating properly and your problem lies somewhere else.

Dual zone systems also have a split door between the heater core and a/c evaporator that often stops functioning properly and it can block the hot air comming from the core.

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I just put a brand new heater core in my 1998 ford expedition and the air is warm not hot so then i changed the thermostat and it was still warm so i took the dash back out and seen that the blind door was...

Do you have eatc/electronic automatic temp control? The temp blend door, I wouldn't remove that, with no door, it seems to me your getting 50/50 hot and cold. Are there any eatc trouble codes?
Does the engine reach operating temp, hopefully over 200 degrees F. Are the heater hoses hot to the touch?
Do you live in an extremely cold region?

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I have a 2001 Hyundai elantra, and the engine temp sensor gets to the middle line, but no hot air blows. the fan blows cool air unless im at a higher speed around 70 mph, and even then there air is only...

2 things it maybe. Your blend door may be stuck open. 2nd Your heater core may need replacing. Check to see if both heater hoses are hot. 3rd heater control valve maybe bad. Good Luck!!!

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Im not getting any hot air from my heater in my 1989 chevy 1500, i changed the thermostat and back flushed the heater core already but still dont get hot air from the heater when turn on. What should i do...

there a valve behind the dash which connected to the heater switch allow the hot antifreeze from the engine to flow to the heater core and back to the engine, check and make sure the linkage still connected to the valve. the valve work like a regular water faucet nobs in your home which open and close; over period of time the valve get seized up. inside of the valve is made out of rubber, heat and time cause it to seized up because the valve is not use on regular basis causing to seized up. the valve is cheap and easy to replace once you get to it. being 1989 i would go ahead and pull the old one out and replace it with the new surprised the valve hold up this long if its original.

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My heater doesnt blow very hot what could be the problem? like its barely warm air, it heats up a little bit when im giving it gas.

Usually the thermostat is the problem.
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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.

Since you state the 2 things you ruled out, that leaves only the water pump. Is the car running hot? The thermostat may be sticking as well... but im leaning toward the pump.

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