Question about 1994 - 1996 Peterbilt 200-33 Engine Coolant Thermostat Seal 252

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1994 Peterbilt I need a complete Heater Hose Diagram

We just got this 1994 Peterbilt and someone worked on it before we got it. The heater hoses do not look like they are on it correctly.

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  • Anonymous Mar 16, 2014

    Need wiring diagram for 2003 48" sleeper

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Has to be some diagrams on internet somewhere. Did you try Peterbilts web site?

Posted on Nov 20, 2013

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1 Answer

2015 Peterbilt 387. Why doesn't the heater work?


It's so new you should not have a problem but you are not getting coolant to flow through your heater core. I suspect an electrical problem around the water shutoff valve or a vacuum hose or cable not opening the heater valve. You might be able to manually open the heater valve.

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It could be the fuel pump but could also be the evap system if you have one. The unused gas drains into the system and the captured gas is supposed to be there for the next startup but isn't.

Aug 10, 2014 | 1994 - 1996 Peterbilt 200-33 Engine...

1 Answer

Heater hose diagrams


The interior cab heating system is identical to 4-wheeler cars. Two hoses connect to the cab heater core box, which is part of the engine radiator coolant system. If you're not getting heat when you turn on the heater fan, then one of the hoses is blocked or the heater core box is blocked up. One hose is inlet, which brings hot coolant from the engine to the cab heater core box. The 2nd hose is outlet which returns the coolant fluid from the heater core box back to the engine coolant system. Its likely these hoses and the heater core box are 20 years old and had never been replaced since the semi truck rolled off the assembly line in 1994. To diagnose for blockage, disconnect both hoses from the engine side, then connect an air blower to one hose to push pressurized air into this hose. Air should be coming out the other hose. If there's no air, or less air pressure, then there's blockage which is restricting hot coolant from passing through, resulting in little or no hot air when you turn on the "hot" air fan. Replace the heater core box first. If you're not getting hot air, then replace both hoses next.
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Nov 18, 2013 | 1994 - 1996 Peterbilt 200-33 Engine...

1 Answer

1994 Toyota pickup / 4WD / 4 cyl. Replaced heater core. Checked heater control valve- working correctly. Filled system from upper hoses at firewall to fill heater core. Connected hoses. replaced...


you could try running engine and open top heater core hose highest point should bleed it fully, failing that look at manual should tell how much water is in system

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1 Answer

Blowing cold air heat will not work?


start with the car off and find the heater hoses. have someone turn the car on and feel for a difference in heat coming from either of the hoses. There should be no change in heat in the hoses till about 200 or about to the temperature where your vehicle normally operates. At this temperature the thermostat should just now release the fluid to the hoses and heat them up. If not then you need a new thermostat. If that works correctly wait a minute or two and feel both heater hoses. the lower hose should be slightly colder than the upper hose. but not a large significance. If so then you will need to change your heater block.

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No heat in my 1994 roadmaster wagon i replaced


If you have the Auto temp control; and you have checked the coolant level then you may need to replace the module that is under the dashboard on the right side footwell,. this is a common problem on these cars. When you remove the plastic under dash panel, look up and there is a module in the duct for the heat that determines the temp so the Climate control works correctly. I pulled mine out of a junkyard car and saved about 80 bucks.

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1 Answer

1994 dodge caravan. No heat. two hoses ar e disconnected. One is from firewall. Is there a part missing.


If it is an inlet hose, there should be a valve that allows water into the heater core. Usually, when someone disconnects these particular hoses, it is because of a leaky heater core. You may have more issues after you reconnect, however in order to get heat, they will have to be connected and if your heater core then leaks, (in the passenger side floorboard), you will have to replace the heater core as well. Good Luck! I hope you find this to be very helpful!

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1 Answer

Heater blow cold air in my 1994 Honda Accord (4


Yes clogged heater core may be the answer in your case .


Dec 11, 2009 | 1994 Honda Accord

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