What are the effects of high temperatures on rubber and plastic PCV valve hoses in engine systems, and what inspection practices should be followed on Cadillac CTS?

Hoses for engine, accessory and emission systems are made of rubber and plastics that tend to wear out and harden when exposed to high heat under the hood and hence require regular check up for cracks, loose clamps, material hardening and leakage. Most hoses have clamps on them, which should be tightened to prevent leakage; if there are no clamps it should be ensured that the hose has not swollen at the fitting or has become rigid. To cut down the emission of hydrocarbons, the gases produced by crankcase blow-by are drawn through the PCV hoses and discharged at the intake manifold to mix with the fresh incoming air for combust. PCV hoses to be checked for cracks and then if blocked, should be cleaned with the help of solvent. These hoses, which usually come in colours, need certain thickness of the wall and certain temperature resistance; when replacing, make certain that the new hoses are made from the same material as the old ones. Hoses sometimes need to be disconnected for checking and identifying them helps in fixing them back in the correct manner. Some of the things that should be included in the inspection process of the T-fittings include whether the plastic has cracks or distortion which is likely to lead to leak. A small piece of vacuum hose can be used as a stethoscope to diagnose faulty vacuum hoses by putting this check probe up to your mouth and hearing, or rather listening to hissing. Fuel lines are usually connected under pressure and as such, if you need to remove the fuel lines be ready to mop the floor because fuel will drip. Look for signs of deterioration of flexible fuel lines particularly in regions of bends and fittings and when replacing it, only use hoses suitable for the particular fuel injection system. Some fuel lines have clips that allow the usage of easy to disconnect equipment on the fuel line. The metal lines used for the fuel lines under the body should be checked for bends, crimps or crack lines. If the fuel line is a metal type, it has to be replaced with the steel tubing, while copper and aluminum do not possess the necessary for resisting the vibrations of the engine. Moreover, check metal brake lines at the master cylinder and brake proportioning unit for crack, and loose fittings because if any spot of leakage is observed in brake fluid, then it means the brake system requires inspection.

Genuine Cadillac PCV Valve Hose

Positive Crankcase Ventilation Valve Hose

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106 PCV Valve Hoses found

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Cadillac Tube Assembly, Pcv
Part Number: 12597774
$15.05 MSRP: $30.70
You Save: $15.65 (51%)
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Product Specifications
- Other Name: TUBE, Engine Crankcase Ventilation; PCV Valve
Fits the following Cadillac Models:
- Escalade | 2009-2014 | 1/2 TON, EXT 1/2 TON, YUKON XL/DENALI XL/ESCALADE ESV, YUKON/DENALI/ESCALADE | 8 Cyl 6.0L, 8 Cyl 6.0L Flex, 8 Cyl 6.2L Flex
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Cadillac Tube Assembly, Pcv
Part Number: 12673868
$156.53 MSRP: $293.34
You Save: $136.81 (47%)
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Product Specifications
- Other Name: TUBE, Engine Crankcase Ventilation; PCV Tube
- Replaces: 12662657, 12654851
Fits the following Cadillac Models:
- ATS | 2013-2016 | 2 DOOR COUPE, 2 DOOR LUXURY COUPE, 2 DOOR PERFORMANCE COUPE, 3 DOOR PREMIUM COUPE, 4 DOOR LUXURY SEDAN, 4 DOOR PERFORMANCE SEDAN, 4 DOOR PREMIUM SEDAN, 4 DOOR SEDAN | 4 Cyl 2.0L
- CT6 | 2016 | 4 DOOR SEDAN, BASE 4 DOOR SEDAN | 4 Cyl 2.0L
- CTS | 2014-2016 | 4 DOOR PERFORMANCE SEDAN, 4 DOOR PLUS SEDAN, 4 DOOR PREMIUM SEDAN, 4 DOOR SEDAN | 4 Cyl 2.0L
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Cadillac Tube Assembly, Int Air Duct Pcv
Part Number: 12687313
$11.87 MSRP: $24.20
You Save: $12.33 (51%)
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Product Specifications
- Other Name: PCV Tube
- Replaces: 12670880, 12670874
Fits the following Cadillac Models:
- CTS | 2016-2019 | 4 DOOR V-SERIES SEDAN | 8 Cyl 6.2L
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Cadillac Tube Assembly, Pcv
Part Number: 12603992
$46.64 MSRP: $83.45
You Save: $36.81 (45%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: TUBE, Engine Crankcase Ventilation
Fits the following Cadillac Models:
- CTS | 2004-2007 | 4 DOOR, 4 DOOR RHD, 4 DOOR(RHD), V 4 DOOR | 6 Cyl 2.8L, 6 Cyl 3.6L
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Cadillac Tube Assembly, Pcv (Foul Air)
Part Number: 12638437
$23.91 MSRP: $48.76
You Save: $24.85 (51%)
ADD TO CART
Product Specifications
- Other Name: TUBE, Engine Crankcase Ventilation
- Replaces: 12609021
Fits the following Cadillac Models:
- ATS | 2013-2015 | 2 DOOR LUXURY COUPE, 2 DOOR PERFORMANCE COUPE, 3 DOOR PREMIUM COUPE, 4 DOOR LUXURY SEDAN, 4 DOOR PERFORMANCE SEDAN, 4 DOOR PREMIUM SEDAN, 4 DOOR SEDAN | 6 Cyl 3.6L
- CTS | 2010-2015 | 2 DOOR COUPE, 4 DOOR, 4 DOOR (RHD), 4 DOOR PERFORMANCE SEDAN, 4 DOOR PREMIUM SEDAN, 4 DOOR SEDAN, 4 DOOR SEDAN(RHD), 4 DOOR STATION WAGON, 4 DOOR STATION WAGON(RHD), 4 DOOR WAGON, 4 DOOR WAGON(RHD) | 6 Cyl 3.0L, 6 Cyl 3.6L
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Cadillac Tube Assembly, Pcv
Part Number: 12650610
$35.92 MSRP: $73.28
You Save: $37.36 (51%)
ADD TO CART
Product Specifications
- Other Name: TUBE, Engine Crankcase Ventilation
Fits the following Cadillac Models:
- Escalade | 2015-2020 | 1/2 TON, 1500 4 DOOR, 1500 4 DOOR SUV, 1500 4 DOOR UTILITY, 1500 CREW CAB, 1500 CREW CAB STANDARD BOX, 4 DOOR 1/2 TON, CLASSIC 1500 CREW CAB LONG BOX, CLASSIC 1500 EXTENDED CAB STANDARD BOX | 8 Cyl 6.2L
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Cadillac Tube Assembly, Pcv
Part Number: 12670791
$22.34 MSRP: $42.16
You Save: $19.82 (48%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: TUBE, Engine Crankcase Ventilation; Breather Tube, PCV Tube
- Replaces: 12619985
Fits the following Cadillac Models:
- Escalade | 2015-2020 | 1/2 TON, 1500 4 DOOR, 1500 4 DOOR SUV, 1500 4 DOOR UTILITY, 1500 CREW CAB, 1500 CREW CAB STANDARD BOX, 4 DOOR 1/2 TON, CLASSIC 1500 CREW CAB LONG BOX, CLASSIC 1500 EXTENDED CAB STANDARD BOX, CLASSIC 1500 REGULAR CAB LONG BOX, CLASSIC 1500 REGULAR CAB STANDARD BOX | 8 Cyl 6.2L
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Cadillac Tube Assembly, Pcv
Part Number: 12609373
$18.74 MSRP: $34.08
You Save: $15.34 (46%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: TUBE, Engine Crankcase Ventilation; PCV Tube
Fits the following Cadillac Models:
- Escalade | 2009-2014 | 1/2 TON, EXT 1/2 TON, YUKON XL/DENALI XL/ESCALADE ESV, YUKON/DENALI/ESCALADE | 8 Cyl 6.0L, 8 Cyl 6.0L Flex, 8 Cyl 6.2L Flex
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Cadillac Tube Assembly, Pcv
Part Number: 12670793
$22.34 MSRP: $42.16
You Save: $19.82 (48%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: TUBE, Engine Crankcase Ventilation; Breather Tube, PCV Tube
- Replaces: 12638607
Fits the following Cadillac Models:
- Escalade | 2015-2020 | 1/2 TON, 1500 4 DOOR, 1500 4 DOOR SUV, 1500 4 DOOR UTILITY, 1500 CREW CAB, 1500 CREW CAB STANDARD BOX, 4 DOOR 1/2 TON, CLASSIC 1500 CREW CAB LONG BOX, CLASSIC 1500 EXTENDED CAB STANDARD BOX, CLASSIC 1500 REGULAR CAB LONG BOX, CLASSIC 1500 REGULAR CAB STANDARD BOX | 8 Cyl 6.2L
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Cadillac Tube Assembly, Pcv
Part Number: 12655013
$30.29 MSRP: $57.16
You Save: $26.87 (48%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: TUBE, Engine Crankcase Ventilation; PCV Tube
Fits the following Cadillac Models:
- ATS | 2016-2019 | 2 DOOR LUXURY COUPE, 2 DOOR PERFORMANCE COUPE, 3 DOOR PREMIUM COUPE, 4 DOOR LUXURY SEDAN, 4 DOOR PERFORMANCE SEDAN, 4 DOOR PREMIUM SEDAN | 6 Cyl 3.6L
- CT6 | 2016-2020 | 4 DOOR SEDAN, BASE 4 DOOR SEDAN, PLATINUM 4 DOOR SEDAN, PREMIUM 4 DOOR SEDAN | 6 Cyl 3.6L
- CTS | 2016-2019 | 4 DOOR PERFORMANCE SEDAN, 4 DOOR PLUS SEDAN, 4 DOOR PREMIUM SEDAN | 6 Cyl 3.6L
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Cadillac Tube Assembly, Pcv
Part Number: 12574660
$34.30 MSRP: $69.98
You Save: $35.68 (51%)
ADD TO CART
Product Specifications
- Other Name: TUBE, Engine Crankcase Ventilation; PCV Valve
- Replaces: 12563269
Fits the following Cadillac Models:
- Escalade | 2002-2003 | EXT 1/2 TON, EXT 3/4 TON, YUKON/DENALI/ESCALADE | 8 Cyl 5.3L, 8 Cyl 6.0L
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Cadillac Tube,Pcv
Part Number: 12620142
$20.14 MSRP: $38.00
You Save: $17.86 (47%)
Ships in 1-3 Business Days
ADD TO CART
Product Specifications
- Other Name: TUBE, Engine Crankcase Ventilation; PCV Tube
Fits the following Cadillac Models:
- CTS | 2009-2014 | 2 DOOR COUPE, 4 DOOR, 4 DOOR (RHD), 4 DOOR RHD, 4 DOOR SEDAN, 4 DOOR SEDAN(RHD), 4 DOOR STATION WAGON, 4 DOOR STATION WAGON(RHD), 4 DOOR WAGON, 4 DOOR WAGON(RHD) | 6 Cyl 3.0L, 6 Cyl 3.6L
- STS | 2009 | 4 DOOR, 4 DOOR(RHD) | 6 Cyl 3.6L
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Cadillac Tube Assembly, Pcv
Part Number: 25202896
$52.21 MSRP: $106.52
You Save: $54.31 (51%)
ADD TO CART
Product Specifications
- Other Name: PCV Tube
- Replaces: 25201118, 12673869
Fits the following Cadillac Models:
- ATS | 2017-2019 | 2 DOOR COUPE, 2 DOOR LUXURY COUPE, 2 DOOR PERFORMANCE COUPE, 3 DOOR PREMIUM COUPE, 4 DOOR LUXURY SEDAN, 4 DOOR PERFORMANCE SEDAN, 4 DOOR PREMIUM SEDAN, 4 DOOR SEDAN | 4 Cyl 2.0L
- CT6 | 2017-2019 | 4 DOOR SEDAN, BASE 4 DOOR SEDAN, PREMIUM 4 DOOR SEDAN | 4 Cyl 2.0L
- CTS | 2017-2019 | 4 DOOR PERFORMANCE SEDAN, 4 DOOR PLUS SEDAN, 4 DOOR PREMIUM SEDAN | 4 Cyl 2.0L
View More
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Cadillac Tube Assembly, Pcv Foul Air
Part Number: 12703915
$37.36 MSRP: $76.20
You Save: $38.84 (51%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: PCV Tube
- Replaces: 12701760, 12664809
Fits the following Cadillac Models:
- ATS | 2016-2019 | 2 DOOR LUXURY COUPE, 2 DOOR PERFORMANCE COUPE, 3 DOOR PREMIUM COUPE, 4 DOOR LUXURY SEDAN, 4 DOOR PERFORMANCE SEDAN, 4 DOOR PREMIUM SEDAN | 6 Cyl 3.6L
- CT6 | 2016-2020 | 4 DOOR SEDAN, BASE 4 DOOR SEDAN, PLATINUM 4 DOOR SEDAN, PREMIUM 4 DOOR SEDAN | 6 Cyl 3.6L
- CTS | 2016-2019 | 4 DOOR PERFORMANCE SEDAN, 4 DOOR PLUS SEDAN, 4 DOOR PREMIUM SEDAN | 6 Cyl 3.6L
View More
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Cadillac TUBE ASM-PCV
Part Number: 25201122
$34.92 MSRP: $71.24
You Save: $36.32 (51%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Replaces: 12654076, 12681589
Fits the following Cadillac Models:
- ATS | 2013-2019 | 2 DOOR COUPE, 2 DOOR LUXURY COUPE, 2 DOOR PERFORMANCE COUPE, 3 DOOR PREMIUM COUPE, 4 DOOR LUXURY SEDAN, 4 DOOR PERFORMANCE SEDAN, 4 DOOR PREMIUM SEDAN, 4 DOOR SEDAN | 4 Cyl 2.0L
- CT6 | 2016-2019 | 4 DOOR SEDAN, BASE 4 DOOR SEDAN, PREMIUM 4 DOOR SEDAN | 4 Cyl 2.0L
- CTS | 2014-2019 | 4 DOOR PERFORMANCE SEDAN, 4 DOOR PLUS SEDAN, 4 DOOR PREMIUM SEDAN, 4 DOOR SEDAN | 4 Cyl 2.0L
View More
View related parts
Cadillac Tube Assembly, Pcv
Part Number: 12681424
$18.86 MSRP: $35.58
You Save: $16.72 (47%)
ADD TO CART
Product Specifications
- Other Name: PCV Tube
- Replaces: 12670876, 12664356, 12670879, 12670882
Fits the following Cadillac Models:
- CT5 | 2022-2024 | V-SERIES NOTCHBACK-BLACKWING | 8 Cyl 6.2L
- CTS | 2016-2019 | 4 DOOR V-SERIES SEDAN | 8 Cyl 6.2L
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Cadillac Tube Assembly, Pcv
Part Number: 12690758
$13.29 MSRP: $25.08
You Save: $11.79 (48%)
Ships in 1-3 Business Days
ADD TO CART
Product Specifications
- Other Name: PCV Tube
- Replaces: 12670881, 12670878, 12668976, 12687310, 12670875
Fits the following Cadillac Models:
- CT5 | 2022-2024 | V-SERIES NOTCHBACK-BLACKWING | 8 Cyl 6.2L
- CTS | 2016-2019 | 4 DOOR V-SERIES SEDAN | 8 Cyl 6.2L
View related parts
Cadillac Tube Assembly, Pcv (To Fresh Air Duct)
Part Number: 12670879
$18.86 MSRP: $35.58
You Save: $16.72 (47%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: TUBE, Engine Crankcase Ventilation
- Replaced by: 12681424
Fits the following Cadillac Models:
- CT5 | 2022-2024 | V-SERIES NOTCHBACK-BLACKWING | 8 Cyl 6.2L
View related parts
Cadillac Tube Assembly, Pcv
Part Number: 12611592
$22.39 MSRP: $40.16
You Save: $17.77 (45%)
Product Specifications
- Other Name: TUBE, Engine Crankcase Ventilation
- Replaced by: 19435537
Fits the following Cadillac Models:
- Escalade | 2007-2008 | 1/2 TON, EXT 1/2 TON, YUKON XL/DENALI XL/ESCALADE ESV, YUKON/DENALI/ESCALADE | 8 Cyl 6.2L
View related parts
Cadillac Hose, Crankcase Vent
Part Number: 10118681
Product Specifications
- Other Name: HOSE, Engine Crankcase Ventilation
Fits the following Cadillac Models:
- Cimarron | 1987-1988 | CIMARRON | 6 Cyl 2.8L

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Cadillac PCV Valve Hose

For superior quality and affordable Cadillac PCV Valve Hoses, consider our website. We proudly present a wide selection of genuine Cadillac PCV Valve Hoses at unbeatable prices. These OEM parts, supported by the manufacturer's warranty, are also eligible for our hassle-free return policy and swift delivery service.

Cadillac PCV Valve Hose Parts Questions & Experts Answers

Tube, Pcv
12594779
Q: What are the effects of high temperatures on rubber and plastic PCV valve hoses in engine systems, and what inspection practices should be followed on Cadillac CTS?
A: Hoses for engine, accessory and emission systems are made of rubber and plastics that tend to wear out and harden when exposed to high heat under the hood and hence require regular check up for cracks, loose clamps, material hardening and leakage. Most hoses have clamps on them, which should be tightened to prevent leakage; if there are no clamps it should be ensured that the hose has not swollen at the fitting or has become rigid. To cut down the emission of hydrocarbons, the gases produced by crankcase blow-by are drawn through the PCV hoses and discharged at the intake manifold to mix with the fresh incoming air for combust. PCV hoses to be checked for cracks and then if blocked, should be cleaned with the help of solvent. These hoses, which usually come in colours, need certain thickness of the wall and certain temperature resistance; when replacing, make certain that the new hoses are made from the same material as the old ones. Hoses sometimes need to be disconnected for checking and identifying them helps in fixing them back in the correct manner. Some of the things that should be included in the inspection process of the T-fittings include whether the plastic has cracks or distortion which is likely to lead to leak. A small piece of vacuum hose can be used as a stethoscope to diagnose faulty vacuum hoses by putting this check probe up to your mouth and hearing, or rather listening to hissing. Fuel lines are usually connected under pressure and as such, if you need to remove the fuel lines be ready to mop the floor because fuel will drip. Look for signs of deterioration of flexible fuel lines particularly in regions of bends and fittings and when replacing it, only use hoses suitable for the particular fuel injection system. Some fuel lines have clips that allow the usage of easy to disconnect equipment on the fuel line. The metal lines used for the fuel lines under the body should be checked for bends, crimps or crack lines. If the fuel line is a metal type, it has to be replaced with the steel tubing, while copper and aluminum do not possess the necessary for resisting the vibrations of the engine. Moreover, check metal brake lines at the master cylinder and brake proportioning unit for crack, and loose fittings because if any spot of leakage is observed in brake fluid, then it means the brake system requires inspection.