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If you are talking about a truck with a standard transmission, it could be coming in from the bottom of the shifter, the rubber protector between the trans and the cab might be loose. You may also have a vent opened.

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Q: What causes heat to blow into cab from engine?
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What causes the heater to blow antifreeze in to the cab of a 1998 ford f-150?

if antifreez is blowing into cab, u need to replace the heater core the core has a hole in it. thses are not repairable and they are cheap to buy


Why does heat not work in 1995 Toyota Corolla?

The heater isn't an extra unit, it is simply pulling heat from the engine and blowing it into the cab. If the engine is not hot the heat will seem like it is not working. If the heat is not working after the engine has warmed up, you may have a fan that doesn't work, or a clogged vent.


If a thermostat in a vehicle engine is stuck open the engine will?

the engine will never fully warm up, and will not produce heat to the cab area for very long during cold weather


What does cab-over-engine mean?

A cab over engine truck is a truck where the driver's cab is on top of the engine. When the engine needs to be repaired, guess what happens? The whole cab tips forward to give the mechanic a look.


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could be a vacuum leak


Why no heat in cab of f350 diesel?

no heat can be caused by,blocked heater core insufficient coolant in engine blocked heater hoses from engine to heater core bad heater thermostat bad thermostat in engine bad heater control switch


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What might be wrong with a 1993 Jeep Cherokee when the temp gauge goes in the red and a have no heat?

Sounds like the thermostat is stuck. It is supposed to open when the engine heats up to keep the engine cool. The same antifreeze fluid is used to heat the inside of the car. If the thermostat is stuck in the closed position, the fluid cannot flow through the engine (thus cooling it) and through the heat exchanger to heat the passenger cab. Sounds like the thermostat is stuck. It is supposed to open when the engine heats up to keep the engine cool. The same antifreeze fluid is used to heat the inside of the car. If the thermostat is stuck in the closed position, the fluid cannot flow through the engine (thus cooling it) and through the heat exchanger to heat the passenger cab. Sound like a coolant leak.


Why does a car take so long to warm up?

Car heating systems usually rely on the excess heat generated by the engine to heat the passenger compartment. There's a thing that looks just like a small radiator that sits in a fan shroud underneath the dash. When the engine has gotten warm, the coolant liquid that circulates through the engine and this little radiator also gets warm. And by having a fan blow air through the radiator, you get warm air that can be directed out through the vents in the dash into the passenger compartment of the car. There's a lot of metal in the engine that needs to heat up before the coolant is warm enough to heat the radiator enough for it to heat the air that you can send out into the cab.


What causes your front ac vents not to blow a lot of air on a 1995 ford E 150 van?

Faulty blend door control, clogged cab filter, weak HVAC blower, obstruction in the HVAC ducts.


What is a firewall on a 2003 Mercury Sable?

The firewall on any car is the wall between the engine and the cab. It protects the driver and passengers from heat off of the engine and in case something goes wrong with your engine. Most parts won't be able to break through the firewall.