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alve, check vacum line first (on heater valve)

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Q: What would cause the defrost on a 1995 gm suburban 1500 blow cold air when the heater core is new?
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What would cause smoke to blow through the defrost of a 1990 Ford F 150 while the heater is switched on?

In many cases leaves can cause smoke to blow through the defrost of a 1990 Ford F 150


What would cause the passenger floor to be constantly wet on a 2003 suburban?

If it's the front passenger side ,I would say your heater core is leaking .


Why would your heat only work on defrost?

ihave a 1986 chevette that when i turn defrost on it blows out heat and when i put heater on it blows out only cold air? ihave a 1986 chevette that when i turn defrost on it blows out heat and when i put heater on it blows out only cold air?


Why would you smell antifreeze through your defrost?

Blown Heater Core - The heater fan blows past the heater core and if it has a hole in it your antifreeze ios being blown onto your windshield.


Why do you keep blowing fuses when you turn on the heater fan but when you take out the compressor fuse it doesnt blow the fuses?

The compressor is coming on because you have the heater set to defrost. Take it off defrost and the compressor will not come on. I would suspect the compressor is locked up.


What would make antifreeze come out of the defrost area on a 1991 mercury grand marquis?

Heater core leaking.


What would cause Water to blow into the car from the defrost vents?

If we are talking rain water not engine coolant I would suspect the drains under the cowl are plugged up with debris (leaves and such). If it is engine coolant then I would suspect the heater core is leaking.


Would the fuse in the heater relay cause the heater to leak into the car?

No...


Why does heater defrost vent not open on a 1989 Sunbird and cold air blow from dash vents but no air blows from heater defrost vents and where are the enter and exit hoses for the heater coil?

I don't know why the vent would not open for the defrost, but it may be related to the fact that your heater core is blown. If your getting nothing but cold air out of the vents when the heat is on, your core is finished and if the core is finished then it is likely related to your vent not opening/switching. Something''s wrong with your heating either way.


Why would a back heater blow cold air and front heater blow hot air in a 2003 Chevrolet Suburban?

The front expansion valve is clogged.


On a dodge ram 1500 why does the defrost only work if its on high?

The most common cause for the defrost not properly working is a malfunctioning blending door. The blending door might be stuck halfway open. This would cause the defrost not to work unless the fan is on high.


On my 95 Toyota corolla The heater defrost switch wont click over to defrost anylonger so the front defrost wont work is there a way to manually switch it over or how would i fix that?

You could always take it to the shop You could always take it to the shop