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The water temperature switch is a protection device that monitors coolant temperature and triggers critical responses when thresholds are exceeded. This electro-mechanical switch activates between 90-120°C (varies by application) to safeguard engine components from overheating damage.
Bimetallic or Wax Pellet Actuation: Provides reliable on/off switching
Normally Open/Closed Configurations: Typically closes to complete warning light circuits
Mounting: Threaded into thermostat housings or cylinder heads
Activates dashboard warning lights
Engages auxiliary cooling fans
Triggers ECU protection modes (in modern vehicles)
Accuracy: ±3°C
Electrical Rating: 12V/5A typical
Material: Brass body with EPDM seals
Stuck open: Risk of unnoticed overheating
Stuck closed: Constant false warnings
Corrosion: Common in neglected cooling systems
Modern variants integrate with ECU networks while maintaining fail-safe mechanical operation - remaining essential for both conventional and electric vehicle thermal management systems.
| DPAT No. | Description | Genuine No. / OE No. | Application | |
| Picture | Model | Year | ||
| DPAT-026101 |  | 3517501-7 1257216 | 50 1.1，1.3 80 1.3，1.5，1.6，1.8，1.9 80 1.8E,S.2.0 E 80 Automatic1.5，1.6 | 1978-80 1972-88 1988-91 1973-88 |
80 1.6 Diesel,Turbo D 90 2.2 CD,2.2 Quattro 90 2.2E,2.3 E 100 1.6,Axant,1.8,1.9 | 1988-91 1984-91 1987-91 1975-84 | |||
100 1.8,2.0,2.2,2.3 100 2.0 Diesel,Turbo D 100 2.4 Diesel 200 2.23 Turbo | 1984-91 1982-91 1989-94 1988-91 | |||
| DPAT-026102 |  | 12 62 1 288 158 | 90 2.2 20V,2.3 20V 100 2.5 TDI(AAT) A 6 2.5 TDI 115/140 cv. A 8 3.7i V8,4.2i V8 | 1988-91 1990-94 1994-97 1994-98 |
| 13 62 1 288 158 | Coupe 20V Quattro 2.2 RS2 2.2i Turbo 20V | 1989-94 1989-94 1994-> | ||
S 6 2.2i Turbo 20V V8 3.6i,4.2i | 1995-> 1988-93 | |||
| DPAT026103 |  | 034 906 161 | 80 2.0i E(PS) 80 2.3i E,Quattro.(NG) A 6 2.3i (AAR) | 1991-94 1987-94 1994-97 |
90 2.0(PS) 90 2.3 E(NG) | 1987-92 1987-92 | |||
100 2.0i E(RT) 100 2.3i E(NF) 100 2.3i (AAR) | 1988-91 1988-91 1991-94 | |||
| DPAT026104 |  | A2 1.4 TDI A2 1.4i A4 2.5 TDI,Quattro,Avant A4 2.8i,Quattro.Avant | 2000-> 2000-> 1997-01 1997-01 | |
A6 2.5 TDI,Quattro,Avant A6 4.2i,Quattro,Avant A8 2.5 TDI Quattro A8 3.7i,4.2i,Quattro | 1997-> 1999-> 1997-> 1999-> | |||
A3 A3 T.A3 Quantt ro A4.A4T A4 Quanttro,Avant | 1997-> 1997-> 1995-05 1995-05 | |||
| DPAT026105 |  | 80 1.6,1.8S 80 1.6i 70 cv.(ABM) 80 1.9 TDI(1Z) 80 1.9 Turbo D(AAZ) | 1988-91 1992-94 1991-94 1991-94 | |
80 2.0 E Digifant(ABK) 80 2.O i Monomotronic 100 2.0 E KE-Motronic Coupe 2.0 E 4cil.(AAD) | 1991-94 1991-94 1991-94 1990-91 | |||
A4 16i(ADP) A4 1.9 TDI 90 cv.(1Z) A4 1.9 TDI 110 cv.(AFN) A6 2.0i(AAE,ABK) | 1995-98 1995-98 1995-98 1994-97 | |||
| DPAT026106 |  | A3 1.6,1.8,1.8T,S3 A3 1.8T quattro,1.9 TDI A4 1.6,1.8,1.8T,1.9 TDI A4 1.8 quattro,1.9 quanttro | 1996-> 1996-> 1995-> 1995-> | |
A4 2.4,2.5TDI,2.6,2.7,2.8 A6 1.8,1.8T,1.9TDI,2.4 A6 2.4quattro,2.5TDI,2.6 A6 2.7T,2.8,2.8quattro | 1995-> 1998-> 1998-> 1994-> | |||
A8 2.8,2.8quattro Cabriolet 2.6,2.8 | 1994-02 1992-00 | |||
| DPAT-066101 |  | 13 621 284 397 | 316i.318i.318is 16 V320i,323i.6cil 320i 24V,Cabrio.Coupe 325i 24V,Coupe | 1987-> 1984-88 1990-> 1990-> |
| 13 621 404 954 | 325 E.325i.Cabrio 518i,Touring 520i 24V,Touring 525i.ix,Touring | 1985-90 1989-91 1990-> 1991-> | ||
| 13 621 709 966 | 530i Motronic 535iMotronic 728i,is.730.732.733i 735i,IL.745i | 1987-> 1986-91 1978-85 1986-91 | ||
| DPAT-086101 |  | 005 565 0324 | 190 D 2.0(OM601) 199 D2.5(OM602) 250 Diesel(OM602) 250 Turbo D(OM602) | 1990-93 1985-88 1987-93 1987-93 |
002 542 25 17 005 542 10 17 005 542 26 17 | C 200 D(OM601) C 200 D,Turbo.(OM604) E 200 D(OM601) E 220 D | 1995-> 1995-> 1993-> 1994-> | ||
KORANDO 2.3 KORANDO 3.2 MUSSO 2.2 TD MUSSO 3.2 | 1998-> 1999-> 1999-> 1999-> | |||
| DPAT-086102 |  | 008 542 45 17 | 200 CE,E,TE.(M111) 300,E,CE,SE,SEL,TE 400 E,SE,SEL.(M119) 600 SE,SEC,SEL,SL,V12 | |
C 180(M11.920) C 280 (M104.941) E 200(M104.940) E 420.E 500.(M119) | 1993-> 1993-> 1993-> 1994-> | |||
S 280. S320.(M104) S 600 V12(M120) SL 280.SL 320.(M104) SL 500(M119) | 1995-> 1995-> | |||
| DPAT-086103 |  | 002 542 73 17 | LK/LN2 814 LK/LN2 817 | 1984-98 1984-98 |
| 007 542 09 17 | MK 122 2MK 2524/27/31 | 1989-94 1991-96 | ||
| 004 542 56 17 | NG 1019.1219.1222 O 303-404-405 Sk 1831-3538 | 1982-91 1980-92 1991-96 | ||
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