Which VW part numbers are on the cooler coolant reservoir coolant regulator housing diagram for the Mk3 Golf?

This diagram lists 37 OEM part numbers for the Mk3 Golf. The first three are 1HM 121 278 A, 1H0 121 251 and 1H0 145 808.

Which Mk3 Golf years and engines does this diagram cover?

This plate is from the Mk3 Golf 1993 - 1996 generation (MEX). The parts on it carry the engine code AAA.

Where is the complete Mk3 Golf factory parts catalogue?

The Mk3 Golf Master Parts Catalogue is available in print and as a PDF from Type 19 Specialists at /shop/library/catalogue-mk3-full/. It carries every plate in this catalogue, not just this one.

Cooler coolant reservoir coolant regulator housing — Mk3 Golf Cooling (1993 - 1996)

Factory title: Volkswagen Golf (1993 - 1996) - Coolant pump

Generation: Mk3 1993 - 1996 (MEX) Group: Drive cooling Rebuild step 8 Parts: 39 Primary OEM: 1HM 121 278 A, 1H0 121 251, 1H0 145 808

Cooler coolant reservoir coolant regulator housing for the Volkswagen Golf Mk3 (1993 - 1996): factory exploded diagram 121075 from the Volkswagen ETKA parts catalogue, group 11 Drive cooling, listing 37 OEM part numbers across 39 catalogued positions including 1HM 121 278 A, 1H0 121 251 and 1H0 145 808. Parts on this plate carry the engine code AAA. Published by Type 19 Specialists; the complete Mk3 Golf catalogue is in print as the Mk3 Golf Master Parts Catalogue.

Parts on this diagram

This Mk3 Golf plate lists 37 OEM part numbers across 39 numbered positions.

Exploded view from the factory parts catalogue. Click a row in the parts table to highlight its position on this diagram. Click any position on the diagram to scroll to its row.

№	Description	Part number
	Cooler for coolant Reservoir Coolant regulator housing AAA AAA	—
	Cooler for coolant Reservoir Coolant regulator housing AAA AAA	—
-	spacer bush	1HM 121 278 A
-	Additional cooler for coolantfor vehicles with air condit.	1H0 121 251
-	Bracketfor vehicles with additionalcoolant radiator	1H0 145 808
-	Grommetfor vehicles with additionalcoolant radiator	867 129 669
-	spacer bushfor vehicles with additionalcoolant radiator	1H0 121 278
(23)	Support for coolant radiator	1HM 121 267 F
(24)	hexagon head bolt (combi) M 6 X 35 M 6 X 35	N 906 321 02
(24)	hexagon head bolt (combi) M 6 X 35-U M 6 X 35-U	N 906 321 01
(29)	End cap	1H0 121 321 C
(34)	Coolant additive, plus-plus "MEX"	G 012 A8G M2
1	Coolant regulator housing	021 121 117 A
12	Pipe union	021 121 121 A
13	O-ring 60 X 3,50 60 X 3,50	N 901 368 02
14	Socket head bolt withhexagon socket head M 6 X 18 M 6 X 18	N 014 703 5
15	Socket head bolt with hexagonsocket head (combination) M 6 X 40 M 6 X 40	N 100 922 01
15	oval head countersunk boltwith multi-point socket head M 6 X 40 M 6 X 40	N 105 821 03
17	Coolant regulator 80 C 80 C	075 121 113 D
19	Pipe union	021 121 133 D
2	Seal	021 121 119 A
20	O-ring 34,5 X 3,55 34,5 X 3,55	N 101 392 01
22	Cooler for coolant 630 X 380 MM 630 X 380 MM	1HM 121 253 H
23	Damping sleeve	1HM 121 267 E
24	Hexagon bolt M 8 X 48 M 8 X 48	N 906 286 01
28	Coolant expansion tank	021 121 407
3	Socket head bolt with hexagonsocket head (combination) M 6 X 85 M 6 X 85	N 904 762 01
30	O-ring 28,5 X 3,8 28,5 X 3,8	1H0 121 687
30	O-ring 28,5 X 3,8 28,5 X 3,8	1H0 121 687 A
31	double stud with hexagon drive 3 X 24/M 6 X 15,5 3 X 24/M 6 X 15,5	N 906 140 01
32	Cover cap	1H0 121 422
34	Coolant additive "MEX"	G00 110 012
35	Coolant additive 1 GALLON "USA","CDN" 1 GALLON	ZVW 237 105
4	Socket head bolt withhexagon socket head M 6 X 25 M 6 X 25	N 014 782 1
5	Washer 6,4 X 12,5 X 1,6 6,4 X 12,5 X 1,6	N 011 524 23
7	Bungs	357 121 140
8	O-ring 19,6 X 3,65 19,6 X 3,65	N 903 168 01
9	retaining spring	025 121 142
9	retaining spring	032 121 142

From the Type 19 workshop

Volkswagen Golf Mk3 work in the Type 19 workshop — the same cars these cooling diagrams are drawn from.

Mk2 Golf 16v Kjet Engine - - best they produced? What do you think? The 1980’s hot hatch — the Mk2 Golf 16v engine was the highest volume production Mk2 Golf Volkswagen released.

Fitment and applicability

What this plate covers, as the factory catalogue records it — nothing here is inferred from the part names.

Vehicle: Volkswagen Golf Mk3
Model years: 1993 - 1996
Generation region: MEX
Generation code: 128
Engine codes on this plate: AAA
Factory group: 11 Drive cooling
Factory subgroup: 121075

Related factory diagrams

Other published cooling plates for the Mk3 Golf in this catalogue.

Coolant cooling system 1993 - 1996 · subgroup 121050
Air guide aaa aam aba acc adc add azz 1993 - 1996 · subgroup 121080
Cooler coolant reservoirflange 1993 - 1996 · subgroup 121070
Coolant pump aaa 1993 - 1996 · subgroup 121015
Coolant cooling system 1995 · subgroup 121020
Coolant cooling system 1995 · subgroup 121022
Coolant pump 4 cylinder 1997 · subgroup 121010
Coolant pump 6 cylinder 1997 · subgroup 121015

The complete Mk3 Golf parts catalogue in print

Questions about this diagram

Which VW part numbers are on the cooler coolant reservoir coolant regulator housing diagram for the Mk3 Golf?: This diagram lists 37 OEM part numbers for the Mk3 Golf. The first three are 1HM 121 278 A, 1H0 121 251 and 1H0 145 808.
Which Mk3 Golf years and engines does this diagram cover?: This plate is from the Mk3 Golf 1993 - 1996 generation (MEX). The parts on it carry the engine code AAA.
Where is the complete Mk3 Golf factory parts catalogue?: The Mk3 Golf Master Parts Catalogue is available in print and as a PDF from Type 19 Specialists at /shop/library/catalogue-mk3-full/. It carries every plate in this catalogue, not just this one.