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1978 Mercedes Benz 300CD Base Coupe 123.150 L5 3.0L

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Your Vehicle 1978 Mercedes Benz 300CD Base Coupe 123.150 L5 3.0L
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1978 Mercedes Benz 300CD Base Coupe 123.150 L5 3.0L Engine Cooling Parts

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Thermostat - 80C

Includes new o-rings affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms

Brand:
Behr - Corporate Logo
ES#:
2862703
Mfg#:
6172001815
In Stock at Vendor
$30.99

This product was last offered at the strikethrough price on
05-07-2026

$29.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Relay - Priced Each

ES#2703176 - 0015420219 - Relay - Priced Each - Five (5) Pin Multi-Purpose Relay - Meyle - Mercedes Benz

Five (5) Pin Multi-Purpose Relay affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms 2X Entries For Our 25th Anniversary Sweepstakes!
We Price Match - Give Us A Call or Chat!
Auxiliary Cooling Fan Relay

Brand:
Meyle - Corporate Logo
ES#:
2703176
Mfg#:
0015420219
In Stock
$34.99

This product was last offered at the strikethrough price on
01-06-2026

$27.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Thermostat - 80°C

ES#8439 - 6172001815 - Thermostat - 80C - Includes new o-rings - Mahle-Behr - Mercedes Benz

Includes new o-rings affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms

Brand:
Mahle-Behr - Corporate Logo
ES#:
8439
Mfg#:
6172001815
Ships in 1-2 days
$22.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Radiator Hose

Upper affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms
Up To Chassis: 003811 - Except Chassis: 003810

Brand:
Dayco - Corporate Logo
ES#:
4920044
Mfg#:
1235010182
In Stock at Vendor
$20.99

This product was last offered at the strikethrough price on
05-07-2026

$19.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Radiator Cap

ES#2747957 - 1235010215 - Radiator Cap - Used to maintain proper pressure and boiling point of your cooling system - Reutter - Mercedes Benz

Used to maintain proper pressure and boiling point of your cooling system affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms

Brand:
Reutter - Corporate Logo
ES#:
2747957
Mfg#:
1235010215
In Stock at Vendor
$18.11

This product was last offered at the strikethrough price on
06-12-2026

$18.07 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Expansion Tank Cap

ES#4327456 - 1245000406 - Expansion Tank Cap - Includes new seal - Meyle - Mercedes Benz

Includes new seal affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms 2X Entries For Our 25th Anniversary Sweepstakes!
We Price Match - Give Us A Call or Chat!

Brand:
Meyle - Corporate Logo
ES#:
4327456
Mfg#:
1245000406
Ships in 3 Business Days
$7.99

This product was last offered at the strikethrough price on
03-01-2026

$5.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Expansion Tank Cap

ES#2533938 - 1245000406 - Expansion Tank Cap - Includes new seal - URO - Mercedes Benz

Includes new seal affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms 2X Entries For Our 25th Anniversary Sweepstakes!
We Price Match - Give Us A Call or Chat!

Brand:
URO - Corporate Logo
ES#:
2533938
Mfg#:
1245000406
Ships in 2 Business Days
$7.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Radiator Hose

ES#2533668 - 1235010082 - Radiator Hose - Upper Hose - URO - Mercedes Benz

Upper Hose affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms 2X Entries For Our 25th Anniversary Sweepstakes!
We Price Match - Give Us A Call or Chat!
From Chassis: 003812 - Also Installed On Chassis: 003810

Brand:
URO - Corporate Logo
ES#:
2533668
Mfg#:
1235010082
In Stock at Vendor
$15.99

This product was last offered at the strikethrough price on
05-07-2026

$14.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Relay - Priced Each

ES#2533602 - 0015420219 - Relay - Priced Each - Five (5) Pin Multi-Purpose Relay - URO - Mercedes Benz

Five (5) Pin Multi-Purpose Relay affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms 2X Entries For Our 25th Anniversary Sweepstakes!
We Price Match - Give Us A Call or Chat!
Auxiliary Cooling Fan Relay

Brand:
URO - Corporate Logo
ES#:
2533602
Mfg#:
0015420219
Ships in 2 Business Days
$12.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Coolant Temperature Sensor

ES#4684768 - 0055422617 - Coolant Temperature Sensor - One (1) Pole Terminal - Vemo - Mercedes Benz

One (1) Pole Terminal affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms

Brand:
Vemo - Corporate Logo
ES#:
4684768
Mfg#:
0055422617
In Stock at Vendor
$10.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Coolant Temperature Sensor

ES#2636056 - 0055421017 - Coolant Temperature Sensor - One (1) Pole Terminal - FAE - Mercedes Benz

One (1) Pole Terminal affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms

Brand:
FAE - Corporate Logo
ES#:
2636056
Mfg#:
0055421017
Ships in 1-2 days
$11.99

This product was last offered at the strikethrough price on
05-07-2026

$10.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Radiator Hose

ES#2533670 - 1235011882 - Radiator Hose - Lower Hose - URO - Mercedes Benz

Lower Hose affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms 2X Entries For Our 25th Anniversary Sweepstakes!
We Price Match - Give Us A Call or Chat!
From Chassis: 003812 - Also Installed On Chassis: 003810

Brand:
URO - Corporate Logo
ES#:
2533670
Mfg#:
1235011882
Ships in 2 Business Days
$9.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Anti-Freeze Tester

ES#4337913 - CTAA195 - Anti-Freeze Tester - Tests all ethylene glycol solutions with radiator hot or cold - CTA Tools - Audi BMW Volkswagen Mercedes Benz MINI Porsche

Tests all ethylene glycol solutions with radiator hot or cold affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms

Brand:
CTA Tools - Corporate Logo
ES#:
4337913
Mfg#:
CTAA195
Ships on Jul 8, 2026
$9.98 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Freeze Plug - Priced Each

ES#2608713 - 000443034002 - Freeze Plug - Priced Each - 34mm - Febi - Mercedes Benz

34mm affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms 2X Entries For Our 25th Anniversary Sweepstakes!
We Price Match - Give Us A Call or Chat!
On Side Of Engine Block

Brand:
Febi - Corporate Logo
ES#:
2608713
Mfg#:
000443034002
In Stock
ON SALE! SAVE 88%
$7.99

This product was last offered at the strikethrough price on
05-02-2026

$0.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Radiator Overflow Hose

ES#4849845 - 0219977682 - Radiator Overflow Hose - One (1) Meter - URO - Mercedes Benz

One (1) Meter affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms 2X Entries For Our 25th Anniversary Sweepstakes!
We Price Match - Give Us A Call or Chat!

Brand:
URO - Corporate Logo
ES#:
4849845
Mfg#:
0219977682
In Stock at Vendor
$8.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Radiator Overflow Hose

ES#2602238 - 0219977682 - Radiator Overflow Hose - One (1) Meter - Original Equipment Supplier - Mercedes Benz

One (1) Meter affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms

Brand:
Original Equipment Supplier - Corporate Logo
ES#:
2602238
Mfg#:
0219977682
Ships in 1-2 days
$8.15 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

More About Engine Cooling Parts

Optimize your engine cooling system performance and heater output with quality drive belts, coolant hoses, cooling system parts, and approved coolant fluids from ECS Tuning. Head off expensive repairs and untimely breakdowns with regularly scheduled cooling system inspection and maintenance.

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Manufacturer names and/or part numbers are used only for identification purposes.

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