Ricky Beals Posted August 11, 2023 Share Posted August 11, 2023 (edited) In the photo there are two sensors. Can someone tell me what they are. Also there is a sensor laying behind them. Any idea? the towel wrapped around the filter housing is gone now. I was chasing down a oil leak and it was the mack filter that the donaldson filter replaced Edited August 11, 2023 by Ricky Beals Quote Link to comment https://www.bigmacktrucks.com/topic/73148-need-some-help-identifying-these/ Share on other sites More sharing options...
fjh Posted August 11, 2023 Share Posted August 11, 2023 air inlet temp on the manifold oil pressure on the pedistal! water temp on the water rail behind there the one hanging is an unused plug! 1 Quote Link to comment https://www.bigmacktrucks.com/topic/73148-need-some-help-identifying-these/#findComment-536751 Share on other sites More sharing options...
Ricky Beals Posted August 11, 2023 Author Share Posted August 11, 2023 I didnt even see the one on the pedestal. Im guessing the air inlet temp has the black tubing coming off it? Thanks I have a lot to learn. What does the gate valve close and why? Quote Link to comment https://www.bigmacktrucks.com/topic/73148-need-some-help-identifying-these/#findComment-536754 Share on other sites More sharing options...
MACKS Posted August 11, 2023 Share Posted August 11, 2023 The valve shuts off the water to the heater core so u don’t sweat to death during the summer,if u have ac it’s mandatory to shut it off.. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/73148-need-some-help-identifying-these/#findComment-536755 Share on other sites More sharing options...
Ricky Beals Posted August 11, 2023 Author Share Posted August 11, 2023 Ok i need to shut it off because i got ac. what is this door for? Cant open it Quote Link to comment https://www.bigmacktrucks.com/topic/73148-need-some-help-identifying-these/#findComment-536768 Share on other sites More sharing options...
tjc transport Posted August 11, 2023 Share Posted August 11, 2023 that is the fresh air door. on AC trucks it opens automatically when ac is on. if the AC is on recirculate, it stays closed. 1 Quote when you are up to your armpits in alligators, it is hard to remember you only came in to drain the swamp.. Link to comment https://www.bigmacktrucks.com/topic/73148-need-some-help-identifying-these/#findComment-536771 Share on other sites More sharing options...
Ricky Beals Posted August 11, 2023 Author Share Posted August 11, 2023 Well i only have max and norm on ac and it stays closed. Looks like its not working and i really dont see the need to try and fix it. would you happen to know if these RD’s have a cabin filter? I can’t locate one if they do. Quote Link to comment https://www.bigmacktrucks.com/topic/73148-need-some-help-identifying-these/#findComment-536776 Share on other sites More sharing options...
Joey Mack Posted August 11, 2023 Share Posted August 11, 2023 Set the switch to defrost. It is operated by an air cylinder, or build air pressure above 90 and slowly slide the vent control knob, and you should hear a loud slamming sound, that will be that door opening and closing.. check to see if the air cylinder and the bell crank are in good shape.. just open the hood and look.. Jojo 1 Quote Link to comment https://www.bigmacktrucks.com/topic/73148-need-some-help-identifying-these/#findComment-536777 Share on other sites More sharing options...
tjc transport Posted August 11, 2023 Share Posted August 11, 2023 47 minutes ago, Ricky Beals said: Well i only have max and norm on ac and it stays closed. Looks like its not working and i really dont see the need to try and fix it. would you happen to know if these RD’s have a cabin filter? I can’t locate one if they do. no cabin filter Quote when you are up to your armpits in alligators, it is hard to remember you only came in to drain the swamp.. Link to comment https://www.bigmacktrucks.com/topic/73148-need-some-help-identifying-these/#findComment-536780 Share on other sites More sharing options...
terry Posted August 11, 2023 Share Posted August 11, 2023 4 hours ago, Ricky Beals said: Ok i need to shut it off because i got ac. what is this door for? Cant open it With that door shut A/C should work a little better, with this shut it recirculates interior air for the A/C. terry Quote Link to comment https://www.bigmacktrucks.com/topic/73148-need-some-help-identifying-these/#findComment-536798 Share on other sites More sharing options...
Joey Mack Posted August 11, 2023 Share Posted August 11, 2023 Close the valve on the water manifold, and if you have one on the left side of the water pump, close it.. Quote Link to comment https://www.bigmacktrucks.com/topic/73148-need-some-help-identifying-these/#findComment-536799 Share on other sites More sharing options...
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