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C4 HVAC, Fuel, Emissions, and Exhaust Forum

For discussion of issues related to C4 Corvette Air Conditioning/Heater/Radiator, Fuel, Emission Control, and Exhaust Systems

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AC Vacuum issue

by Ontway • 8/7/25 5:53pm

Latest: 8/8/25 11:08am by Ontway

1004

Views

2

Replies

my 1990 runs above 230 degrees

by BillyDee • 8/20/12 9:35pm

Latest: 7/29/25 8:53am by Dennis L Brooks

31913

Views

35

Replies

Air only comming out of the windshild defrostor

by rugdoz • 7/30/12 10:08am

Latest: 5/4/25 6:51pm by KA5CDJ

15311

Views

6

Replies

A/C Compressor Clutch Won't Engage

by chevykid • 2/25/25 2:30pm

Latest: 2/26/25 4:34pm by chevykid

1609

Views

2

Replies

How many have had cracked radiators-Should we just replace to be safe?

by TripleBlackBeauty • 8/20/24 12:30pm

Latest: 8/21/24 10:27am by Phat98

803

Views

3

Replies

Cold start problem

by Bob Rowan • 8/1/24 4:17pm

Latest: 8/2/24 6:20pm by

1501

Views

5

Replies

Unknown bracket location

by C4Maverick • 3/16/24 6:23pm

Latest: 3/17/24 9:31am by Bob DeCardenas

1016

Views

2

Replies

Crossfire flooding.

by KiwiVette • 10/11/23 8:11pm

Latest: 10/18/23 3:40pm by katanaman

1589

Views

1

Replies

FIC injectors

by Guy-C4 • 7/31/23 2:30pm

Latest: 7/31/23 4:01pm by Guy-C4

1331

Views

2

Replies

Project wrapped up

by katanaman • 3/25/23 4:50pm

Latest: 3/25/23 9:36pm by

1222

Views

1

Replies

Continuing through the EGR issues

by katanaman • 3/20/23 5:09pm

Latest: 3/20/23 9:07pm by

1080

Views

1

Replies

That was noisy...

by katanaman • 3/18/23 1:55pm

Latest: 3/19/23 12:13pm by

1401

Views

1

Replies

EGR 2

by katanaman • 3/8/23 10:52pm

Latest: 3/9/23 9:58pm by katanaman

963

Views

1

Replies

Cleaning that EGR

by katanaman • 3/8/23 2:30pm

Latest: 3/8/23 7:58pm by

1522

Views

1

Replies

No heat in my '95

by RitaJean • 1/10/23 7:21pm

Latest: 1/11/23 8:57am by Superc63

2088

Views

3

Replies

Swapping Crossfire for Carburetor

by firstvette84 • 11/2/22 8:49am

Latest: 12/2/22 10:54am by Our-83

5022

Views

9

Replies

Blower motor runs on High constantly

by elvis628 • 9/6/22 1:46pm

Latest: 10/24/22 9:13am by

1808

Views

6

Replies

Excessively high idle

by firstvette84 • 8/22/22 6:06am

Latest: 8/24/22 8:57am by TLAVAC

2645

Views

5

Replies

96 blend door actuator

by 96 fred owen • 3/25/22 6:50am

Latest: 3/29/22 6:58am by 96 fred owen

2921

Views

9

Replies

Heater blows cold

by AFammo • 1/14/22 2:47am

Latest: 3/8/22 1:06pm by lkedmiston

3329

Views

6

Replies

1990 L98 Cooling issue.

by BobPurz • 9/29/21 4:37am

Latest: 10/9/21 8:08pm by VetteTonic

4454

Views

7

Replies

1991-1996 Radiator/Condenser Guard, AC and FansTroubleshooting

by Superc63 • 5/4/21 3:53am

Latest: 5/13/21 7:30am by Black Shark

1863

Views

4

Replies

VIDEO: 1990-1993 Blend Door Actuator and Heater Core Removal

by Superc63 • 4/2/21 12:17pm

Latest: 5/4/21 4:14am by Superc63

7951

Views

3

Replies

1990 C4 Z51 6sp - 3 Row Radiator

by grantar2 • 4/7/21 2:21pm

Latest: 4/21/21 9:50am by DanC4-90

2012

Views

3

Replies

Gas gauge

by manchestershark • 8/6/20 7:40am

Latest: 9/2/20 5:36pm by 396c4

2395

Views

3

Replies

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