Question about 1988 Chevrolet Corvette

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NO hot air when heater is turned on.

I have a 1988 Corvette coup. When i turn on the heater there is only cold air. I hoses leading to the firewall in the engine compartment are both hot.

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If pipes r hot would be looking at heater matrix under dash

Posted on Nov 13, 2008

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1: not enough liquid in the system (air in the heater core)
2: inoperative heater valve not allowing hot liquid into the core
3: hot/cold blend door in the heater box stuck on cold
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A clogged heater core will have one hot hose and one significantly cooler hose at the firewall connection; easily tested by hand. a good core will have both hoses very hot to the touch when the heater is on full blast.
Make sure that the system is full and at operating temperature, and the heater controls set on full heat. Feel the hoses at the firewall; if they are both too hot to touch then the problem is in the heater box or controls.

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CHECK FOR LOW COOLANT,NOT ENOUGH COOLANT IN THE SYSTEM.IF COOLANT LEVEL OKAY.THERMOSTAT NEED CHANGING STUCK OPEN.IF THERMOSTAT BEEN REPLACED.CHECK BOTH BOTH RADIATOR HOSES AND HEATER CORES HOSES THEY ALL SHOULD BE VERY HOT.IF ALL HOSES HOT AND BOTH HEATER CORES HOSES GOING INTO FIREWALL IS HOT.HEATER DOOR NOT OPEN ALL THE WAY OR STUCK.IF ONE OF THE HEATER HOSES GOING INTO FIREWALL HOT AND OTHER HEATER HOSE COMING OUT OF FIREWALL NOT HOT.MORE LIKELY HEATER CORE PLUGGED NEED TO FLUSH OUT COOLING SYSTEM.FLUSH OUT COOLING SYSTEM IF NOT BEEN DONE IN A LONG WHILE.

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Heater will not blow out hot air in my 1988 ford F250. Thermostat and hoses are all good. Is there a sensor that may be causing the problem and where is it located?


Hello! There isn't a sensor that would disallow heated water to circulate through the heater core...If the temperature gauge rises to normal...And the upper radiator hose is hot along with the lower hose ...I can conclude water is circulating through the block...Question then becomes; Is it circulating through the heater core? And the answer to that is, I don't think so...With the heater control turned on high feel the outlet heater core hose (facing engine it's the one on the left) if it feels cold or not as hot as the inlet then one of two items are at fault...#1...The Plenum assembly, which the heater core sets in has an open vacuum line...#2...The heat control valve cable or the valve itself is not opening...See picture of valve below...It is on the firewall...Let me know if heat is passing through the heater core...If hot water isn't passing through the core and the valve is opening than the core itself is blocked...send a comment...Guru...Saailer

saailer_214.jpgMOTORCRAFT Part # YG229...$20

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Is the inlet and outlet heater hoses hot and if so you have a seperate acuator for your hot/cold door.Check for vacuum there if you have vacuum to the acuator then it must be a faulty acuator or jambed door.

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Replaced water pump, heater core, flushed lines, replaced radiator...car runs about 195 temp blows good air in the car but air is cold. Lines will burn your hand if you touch them but no heat in the...


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This is usually located to the rear of the engine close to the firewall. Coolant hoses should run to it and away from it to carry hot coolant inside the car.

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Sounds like a stuck heater core valve. Find heater core valve. Under hood, find the two heater core hoses going into firewall. One of the hoses has a valve. Operate temperature control (full heat, then full cold) check that valve changes position. If not either replace valve or control system failure. Also, when temperature control in cold position, one hose should feel hot and the other cold. Temp fix: disable valve to close no heat or on heat.

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Hi There, If the fan blows only cold air, then you might have a restriction on the heater core. The heater core is like a small radiator inside your dash. The coolant flow through it can be restricted by corrosion. The lack of flow of coolant through the heater core will result in a lack of warm air inside the car. Flushing out the heater core may help. If not, you will have to replace it. I would say though, 80% of the time the cause is just restriction. Get the heater core flushed and I am sure you will get your heat back. MIke

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