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An underbody assembly for a vehicular climate control system is disclosed including fluid flow conduits formed of steel coated with polymeric material such as nylon 12. The conduits are continuous between opposite ends free of joints or flexible connection. In one form, the conduit includes branches

An underbody assembly for a vehicular climate control system is disclosed including fluid flow conduits formed of steel coated with polymeric material such as nylon 12. The conduits are continuous between opposite ends free of joints or flexible connection. In one form, the conduit includes branches or connectors formed of polymeric material sealed to the outer polymeric layer of the tube.

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1. A conduit for a climate control system for an automotive vehicle comprising: a rigid steel tube defining an interior fluid passage, said tube including an outer layer of polymeric material; andwherein said tube includes at least one hole therethrough communicating with said interior fluid passage

1. A conduit for a climate control system for an automotive vehicle comprising: a rigid steel tube defining an interior fluid passage, said tube including an outer layer of polymeric material; andwherein said tube includes at least one hole therethrough communicating with said interior fluid passage, a fluid branch formed of polymeric material disposed at an angle to a longitudinal axis of said tube, said fluid branch is connected to said tube in fluid communication with said interior fluid passage defined by said tube through said hole and said connection is sealed by said polymeric material of one of said outer layer and said fluid branch; andwherein said fluid branch includes a tubular portion surrounding said hole in said tube, and said fluid branch is joined to said tube in fluid tight sealing relation; andwherein said fluid branch includes a reduced diameter extension disposed in said hole in said tube with said hole surrounding the reduced diameter extension and with said extension and the outer layer of said tube defining a fused butt joint. 2. A conduit for a climate control system as claimed in claim 1 wherein said tube is continuous between opposite ends, free of any joints or flexible connections. 3. A conduit for a climate control system as claimed in claim 2 wherein said polymeric material is polyamide. 4. A conduit for a climate control system as claimed in claim 3 wherein said polyamide is nylon 12. 5. A conduit for a climate control system as claimed in claim 4 wherein said tube is at least ten feet in length. 6. A conduit as claimed in claim 5 wherein said conduit includes a connector at at least one end and said conduit is a continuous tube free of any joints or flexible connections. 7. A conduit as claimed in claim 5 wherein said conduit includes a hose connection at at least one end. 8. A fluid conduit as claimed in claim 6 wherein said tube includes a radial annular upset spaced from a free end thereof, said connector defines a through bore having a counter bore at one end sized to receive said upset, an enlarged portion at an opposite end having a diameter larger than the diameter of said tube and a central portion sized to receive said tube, said tube disposed in said central portion with said upset seated in said counter bore, said free end disposed in said enlarged diameter portion of said tube and expanded to conform to said enlarged portion of said through bore to secure said connector to said tube. 9. A conduit as claimed in claim 1 wherein said fluid branch includes a polymeric mounting plate extending longitudinally of said tube, said mounting plate includes an inner arcuate surface complementary to the outer surface of said polymeric layer of said tube and said fluid branch is secured to said tube by melted polymeric material of at least one of said outer layer of said tube and said mounting plate of said fluid branch. 10. A conduit as claimed in claim 9 wherein said arcuate surface of said polymeric mounting plate includes beads of polymeric material extending longitudinally and transversely of said mounting plate and said mounting plate is sealed to said outer layer of said tube by melted polymeric material of at least one of said outer layer of said tube and said beads. 11. A conduit for a climate control system for an automotive vehicle comprising: a rigid steel tube defining an interior fluid passage, said tube including an outer layer of polymeric material;wherein said tube includes at least one hole therethrough communicating with said interior fluid passage, a fluid branch formed of polymeric material disposed at an angle to a longitudinal axis of said tube, said fluid branch is connected to said tube in fluid communication with said interior fluid passage defined by said tube through said hole and said connection is sealed by said polymeric material of one of said outer layer and said fluid branch;wherein said fluid branch includes a tubular portion surrounding said hole in said tube, and said fluid branch is joined to said tube in fluid tight sealing relation;wherein said fluid branch includes a polymeric mounting plate extending longitudinally of said tube, said mounting plate includes an inner arcuate surface complementary to the outer surface of said polymeric layer of said tube and said fluid branch is secured to said tube by melted polymeric material of at least one of said outer layer of said tube and said mounting plate of said fluid branch;wherein said mounting plate includes opposite ends defining arcuate flanges having an arcuate shape generally complimentary to the outer diameter of said outer layer of said tube, and a separate cap shaped similarly to said mounting plate having end flanges similar to said end flanges of said mounting plate, said mounting plate and said separate cap with arcuate inner surfaces between said flanges having a diameter larger than the diameter of said outer layer of said tube and mating longitudinal edges in facing relation to each other, said end flanges secured to said outer polymeric layer of said tube and said mating longitudinal edge welded together to form a fluid tight joint. 12. An underbody assembly of fluid conduits for a vehicle climate control system including: a plurality of tubes each defining a fluid passage, at least one of said tubes being a steel tube and said steel tube including an outer polymeric layer; andwherein said steel tube includes at least one hole therethrough communicating with said interior fluid passage, a fluid branch formed of polymeric material disposed at an angle to a longitudinal axis of said steel tube, said fluid branch is connected to said steel tube in fluid communication with said interior fluid passage defined by said steel tube through said hole and said connection is sealed by said polymeric material of one of said outer layer and said fluid branch; andwherein said fluid branch includes a tubular portion surrounding said hole in said tube, and said fluid branch is joined to said tube in fluid tight sealing relation; andwherein said fluid branch includes a reduced diameter extension disposed in said hole in said tube with said hole surrounding the reduced diameter extension and with said extension and the outer layer of said tube defining a fused butt joint. 13. An underbody assembly of fluid conduits as claimed in claim 12 wherein said tubes are continuous between opposite ends free of any joints or flexible connections. 14. An underbody assembly of fluid conduits as claimed in claim 13 wherein said tubes are joined together by mounting brackets. 15. An underbody assembly of fluid conduit as claimed in claim 14 wherein at least a portion of said tubes include a connector at at least one end thereof. 16. An underbody assembly of fluid conduit as claimed in claim 14 wherein: at least a portion of said tubes includes a hose connection at at least one end thereof. 17. An underbody assembly of fluid conduit as claimed in claim 14 wherein said tubes are at least ten feet in length between opposite ends. 18. An underbody assembly of fluid conduit as claimed in claim 17 wherein one of tubes has an outer diameter that is smaller than the outer diameter of at least one other of said tubes. 19. An underbody assembly of fluid conduit as claimed in claim 13 wherein said polymeric material is polyamide. 20. An underbody assembly for fluid conduit as claimed in claim 19 wherein said polymeric material is nylon 12.