kbdecatur

Hello all. Yesterday I was trying to get my heat to work and all I get is cold fresh air out of the vents. Blower motor is working. Can anyone help me with this? Thanks in advance!!

joe_padavano

Not without more info.

Year?
Model?
With or without A/C?
Stock or modified AT ALL?
Have the vacuum hoses ever been messed with?

kbdecatur

72 cutlass
Non A/C
Stock
As far as vacuum hoses I'm not sure

joe_padavano

The first thing to check is the temperature of the heater hoses with the engine warmed up. Are both hoses the same temp, or is one noticeably warmer than the other? If the latter, the heater core is blocked. Note the the hose from the back of the intake to the heater core is inlet to the core and the longer one from the core to the water pump is outlet from the core.

If the heater core is not blocked, check the function of the temperature blend door in the heater box under the dash. The blend door is operated by a cable from the slider **** on the dash control. Often the cable can break or the clamp that holds the cable to the bracket can come loose. This can prevent the door from changing position, thus no hot air.

Also, are you getting air flow from the heater duct at the bottom of the heater box? If not, you may have leaves or a mouse nest built up around the heater core, blocking air flow.

These are the only possible options. There isn't anything else to the system for a non-A/C car. Your car does not have a heater control valve, for example (or at least is didn't when stock - this is the original motor and intake, right?).

kbdecatur

Thanks for your input i will check these things out.

scottv442

do you water/anti-freeze in the radiator?
no fluid...no heat

kbdecatur

Yes I have antifreeze in it.

wifespain

thermostat stuck open would give you no heat also

kbdecatur

Problem solved. Low on antifreeze added it and it heated up in seconds. Didn't see a leak but I gotta keep my eyes on it. Thanks for the input guys..