WELCH PLUG 36.6MM

Product Description

The Arrowhead Welch Plug 36.6mm is an essential engine component designed for sealing core holes in the engine block or cylinder head. It helps to maintain proper coolant flow and pressure, preventing leaks that could lead to engine overheating or damage. This plug is specifically sized for certain Audi and Volkswagen engines, ensuring a secure and reliable fit where a 36.6mm welch plug is required.

Compatible with select Audi and Volkswagen models, this welch plug is used in various engine applications. Due to variations in engine design across different models and years, it is important to confirm your vehicle's model, year, engine size, and engine code before ordering to ensure correct fitment.

Symptoms of a failing or missing welch plug include coolant leaks around the engine block, overheating, visible corrosion or rust near the plug location, unexplained drops in coolant level, and in severe cases, engine misfires or rough running. If you notice any of these issues, the welch plug may need inspection or replacement.

Replacement of the welch plug is necessary if there are signs of leakage, corrosion, or if the plug has become dislodged during engine work. Always replace with the correct size to maintain engine integrity and prevent coolant loss.

Order your Arrowhead Welch Plug 36.6mm from MiMi Auto Parts for reliable engine sealing. We offer nationwide delivery across South Africa, and our team is ready to assist with fitment queries to ensure you get the right part for your vehicle.

Common signs this part may need replacement

• Coolant leaking from the engine block or cylinder head
• Visible corrosion or rust around the plug area
• Unexplained drop in coolant level
• Engine overheating
• Steam or coolant smell from the engine bay
• Engine misfire due to coolant entering combustion chamber
• Rough running or poor engine performance
• Wet spots or stains under the engine

Typical replacement guidance

Replace the welch plug if you notice coolant leaks, corrosion, or if the plug has been removed during engine repairs. Always use the correct size and ensure a proper seal to prevent coolant loss and engine damage.

Why timely replacement matters

Timely replacement of a faulty welch plug prevents coolant leaks and potential engine overheating. Neglecting this small part can lead to major engine damage and costly repairs.

Vehicle Compatibility

This part is confirmed to fit the following vehicles:

• AUDI 100 C1 Saloon (801, 803, 805, 807, 811, 813, F104) 1970 – 1976 1.8 (ZU) – 63 kW / 85 HP
• AUDI 100 C1 Saloon (801, 803, 805, 807, 811, 813, F104) 1970 – 1976 1.8 (ZZ) – 74 kW / 100 HP
• AUDI 100 C1 Saloon (801, 803, 805, 807, 811, 813, F104) 1970 – 1976 1.9 (ZJ) – 82 kW / 112 HP
• AUDI 200 C2 Saloon (437, 438) 1979 – 1982 2.1 5E (WC) – 100 kW / 136 HP
• AUDI 200 C2 Saloon (437, 438) 1979 – 1982 2.1 5T (WK) – 100 kW / 136 HP
• AUDI 200 C3 Saloon (447, 448) 1985 – 1991 2.2 Turbo (MC) – 121 kW / 165 HP
• AUDI 500 C2 Saloon (431, 433, 434) 1976 – 1984 1.6 (YV) – 63 kW / 85 HP
• AUDI 500 C2 Saloon (431, 433, 434) 1976 – 1984 1.9 (WH) – 74 kW / 100 HP
• AUDI 500 C2 Saloon (431, 433, 434) 1976 – 1984 2.0 (WA) – 85 kW / 115 HP
• AUDI 500 C2 Saloon (431, 433, 434) 1976 – 1984 2.0 D (CN) – 51 kW / 70 HP
• AUDI 500 C2 Saloon (431, 433, 434) 1976 – 1984 2.1 (WB|WE) – 85 kW / 115 HP
• AUDI 500 C2 Saloon (431, 433, 434) 1976 – 1984 2.1 (WC) – 100 kW / 136 HP
• AUDI 500 C3 Saloon (443, 444) 1982 – 1991 1.8 (DS|JW|NP|SH) – 66 kW / 90 HP
• AUDI 500 C3 Saloon (443, 444) 1982 – 1991 1.9 (WH) – 74 kW / 100 HP
• AUDI 500 C3 Saloon (443, 444) 1982 – 1991 2.1 (WC) – 100 kW / 136 HP
• AUDI 500 C3 Saloon (443, 444) 1982 – 1991 2.2 (KU) – 101 kW / 137 HP
• AUDI 500 C3 Saloon (443, 444) 1982 – 1991 2.2 (KZ) – 85 kW / 115 HP
• AUDI 500 C3 Saloon (443, 444) 1982 – 1991 2.2 Turbo (MC) – 121 kW / 165 HP
• AUDI 500 C3 Saloon (443, 444) 1982 – 1991 2.3 E (NF) – 100 kW / 136 HP
• AUDI 500 C4 Saloon (4A2) 1990 – 1996 2.3 E (AAR) – 98 kW / 133 HP
• AUDI 500 C4 Saloon (4A2) 1990 – 1996 2.8 E (AAH) – 128 kW / 174 HP
• AUDI 80 B1 Saloon (80, 82) 1972 – 1978 1.5 (ZB) – 55 kW / 75 HP
• AUDI 80 B1 Saloon (80, 82) 1972 – 1978 1.5 (ZC) – 63 kW / 85 HP
• AUDI 80 B1 Saloon (80, 82) 1972 – 1978 1.6 (YN) – 55 kW / 75 HP
• AUDI A6 / S6 C4 (4A2) 1994 – 1998 2.6 (ABC) – 110 kW / 150 HP
• AUDI A6 / S6 C4 (4A2) 1994 – 1998 2.8 (AAH|AFC) – 128 kW / 174 HP
• AUDI A6 / S6 C5 (4B2, 4B4) 1997 – 2004 1.8 T (AEB|ANB|APU|ARK|AWT) – 110 kW / 150 HP
• AUDI A6 / S6 C5 (4B2, 4B4) 1997 – 2004 1.9 TDI (AVF|AWX) – 96 kW / 130 HP
• AUDI A6 / S6 C5 (4B2, 4B4) 1997 – 2004 2.4 (AGA|ALF|AML|APS|ARJ) – 121 kW / 165 HP
• AUDI A6 / S6 C5 (4B2, 4B4) 1997 – 2004 2.4 (BDV) – 125 kW / 170 HP
• AUDI A6 / S6 C5 (4B2, 4B4) 1997 – 2004 2.5 TDI (BCZ|BDG|BFC) – 120 kW / 163 HP
• AUDI A6 / S6 C5 (4B2, 4B4) 1997 – 2004 2.7 T quattro (ARE|BES) – 184 kW / 250 HP
• AUDI A6 / S6 C5 (4B2, 4B4) 1997 – 2004 2.8 quattro (ACK|ALG|AMX|APR|AQD) – 142 kW / 193 HP
• AUDI A6 / S6 C5 (4B2, 4B4) 1997 – 2004 3.0 (ASN) – 162 kW / 220 HP
• AUDI A6 / S6 C5 (4B2, 4B4) 1997 – 2004 3.0 quattro (ASN) – 162 kW / 220 HP
• AUDI A6 / S6 C5 (4B2, 4B4) 1997 – 2004 4.2 quattro (ARS|ART|ASG|AWN) – 220 kW / 299 HP
• AUDI A6 / S6 C5 Avant (4B5, 4B6) 1998 – 2006 2.4 (AGA|ALF|AML|APS|ARJ) – 121 kW / 165 HP
• AUDI A6 / S6 C5 Avant (4B5, 4B6) 1998 – 2006 2.4 (BDV) – 125 kW / 170 HP
• AUDI A6 / S6 C5 Avant (4B5, 4B6) 1998 – 2006 2.5 TDI (BCZ|BDG|BFC) – 120 kW / 163 HP
• AUDI A6 / S6 C5 Avant (4B5, 4B6) 1998 – 2006 2.5 TDI Allroad quattro (AKE|BAU|BDH) – 132 kW / 180 HP
• AUDI A6 / S6 C5 Avant (4B5, 4B6) 1998 – 2006 2.7 T Allroad quattro (ARE|BES) – 184 kW / 250 HP
• AUDI A6 / S6 C5 Avant (4B5, 4B6) 1998 – 2006 2.8 quattro (ACK|ALG|AMX|APR|AQD|ATQ) – 142 kW / 193 HP
• AUDI A6 C4 Avant (4A5) 1994 – 1998 2.6 (ABC) – 110 kW / 150 HP
• AUDI A6 C4 Avant (4A5) 1994 – 1998 2.6 (ACZ) – 102 kW / 139 HP
• AUDI A8 / S8 D2 (4D2, 4D8) 1995 – 2002 2.8 quattro (AAH) – 128 kW / 174 HP
• VOLKSWAGEN CADDY I (14) 1980 – 2008 1.5 (JB) – 51 kW / 70 HP
• VOLKSWAGEN CADDY I (14) 1980 – 2008 1.6 (EW) – 55 kW / 75 HP
• VOLKSWAGEN CADDY I (14) 1980 – 2008 1.6 D (CR|JK|ME) – 40 kW / 55 HP
• VOLKSWAGEN CADDY I (14) 1980 – 2008 1.8 (JH) – 70 kW / 95 HP
• VOLKSWAGEN GOLF I (17) 1974 – 1984 1.1 (FA|GG) – 37 kW / 50 HP

Fitment support

Not sure if this part fits your vehicle? Contact MiMi Auto Parts with your vehicle make, model, year, and engine code before ordering and we will help confirm fitment.

Installation note

Some electrical components require correct wiring, calibration, or diagnostic scanning after installation. Professional installation is recommended where applicable.

Frequently Asked Questions

How do I know if it is the alternator or the battery?

Both can cause starting and charging problems. A charging-system test distinguishes a failing alternator from a weak battery. Have the system tested before replacing parts to confirm the actual fault.

Does this part fit my vehicle?

Please check the vehicle compatibility section on this page and confirm your vehicle make, model, year, engine size, and engine code before ordering. If you are unsure, contact MiMi Auto Parts before checkout.

Is the price VAT-inclusive?

Yes, product prices on MiMi Auto Parts are shown inclusive of VAT where applicable.

Do you deliver across South Africa?

Yes, MiMi Auto Parts delivers nationwide in South Africa. Delivery cost and estimated timing are calculated during checkout based on your location.

Is professional installation recommended?

Professional installation is recommended for safety-critical and technical parts such as airbag, clock spring, brakes, suspension, steering, clutch, cooling, engine, and electrical components. For guidance specific to this part, see the installation note on this page.