Question about 1966 Ford Mustang

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Heater core has been replaced and still blows minnimal warm air.

I replaced the heater core on my 66 mustang and I'm still getting minnimal warm air. Temp guage stays cool and it has been replaced as well. ???

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This brings back memories. One winter I kept an army surplus wool blanket in the car that I would lay over my lap because of the lack of heat..

One quick and dirty temporary work around is to shove a ball of newspaper up through the heater door to plug the RH fresh air duct that goes straight up from the heater assembly. This does not make it warm and cozy, but does make it livable until warm weather arrives.

First of all, check your thermostat and make sure that it's working correctly and the right temperature range. Back in the days, it was not unusual to change the thermostat in the spring and in the fall.The lower temp one in the spring, to allow the engine to run cooler during the summer and visa-versa in the fall. You've replaced the heater core so that's out of the way. Next, check an/or replace the heater hoses. If the heater hoses are old, they may be breaking down inside and restricting the water flow. Be sure to check for any crimping or tight turns that the hoses make. You want the water to flow as easily as possible. When you have the time to pull the heater assembly, tear it down and replace all of the foam pads, seals and so-forth. You can get a kit that contains all of these parts from many of the mustang parts sources. When you do this project, it's a good time to lubricate all of the control cables, pivots and so-forth.
Hope this info helps,and have a good one!
Ron

Posted on Feb 20, 2009

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IF YOU HAVE A HEATER CONTROL VALVE IT MAY BE PLUGGED OR STUCK HALF WAY CLOSED. THIS VALVE IF YOU HAVE ONE WILL BE ON ONE OF THE TWO HOSES GOING TO YOUR HEATER CORE. USUALLY CABLE OR VACUUM CONTROLLED. REPLACE THE HEATER CONTROL VALVE AND IT WILL RESTORE THE WATER FLOW TO THE HEATER CORE.

Posted on Jan 24, 2009

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