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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

197Topics
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1990 Fuel Injectors

by DanC4-90 · 4/29/26 10:52am
500
15
Latest: 5/7/26 8:42pm by Norsky

AC Vacuum issue

by Ontway · 8/7/25 5:53pm
1327
2
Latest: 8/8/25 11:08am by Ontway

my 1990 runs above 230 degrees

by BillyDee · 8/20/12 9:35pm
32163
35
Latest: 7/29/25 8:53am by Dennis L Brooks

Air only comming out of the windshild defrostor

by rugdoz · 7/30/12 10:08am
15498
6
Latest: 5/4/25 6:51pm by KA5CDJ

A/C Compressor Clutch Won't Engage

by chevykid · 2/25/25 2:30pm
1800
2
Latest: 2/26/25 4:34pm by chevykid

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

by TripleBlackBeauty · 8/20/24 12:30pm
946
3
Latest: 8/21/24 10:27am by Phat98

Cold start problem

by Bob Rowan · 8/1/24 4:17pm
1640
5
Latest: 8/2/24 6:20pm by

Unknown bracket location

by C4Maverick · 3/16/24 6:23pm
1065
2
Latest: 3/17/24 9:31am by Bob DeCardenas

Crossfire flooding.

by KiwiVette · 10/11/23 8:11pm
1642
1
Latest: 10/18/23 3:40pm by katanaman

FIC injectors

by Guy-C4 · 7/31/23 2:30pm
1364
2
Latest: 7/31/23 4:01pm by Guy-C4

Project wrapped up

by katanaman · 3/25/23 4:50pm
1274
1
Latest: 3/25/23 9:36pm by

Continuing through the EGR issues

by katanaman · 3/20/23 5:09pm
1127
1
Latest: 3/20/23 9:07pm by

That was noisy...

by katanaman · 3/18/23 1:55pm
1435
1
Latest: 3/19/23 12:13pm by

EGR 2

by katanaman · 3/8/23 10:52pm
1004
1
Latest: 3/9/23 9:58pm by katanaman

Cleaning that EGR

by katanaman · 3/8/23 2:30pm
1575
1
Latest: 3/8/23 7:58pm by

No heat in my '95

by RitaJean · 1/10/23 7:21pm
2150
3
Latest: 1/11/23 8:57am by Superc63

Swapping Crossfire for Carburetor

by firstvette84 · 11/2/22 8:49am
5242
9
Latest: 12/2/22 10:54am by Our-83

Blower motor runs on High constantly

by elvis628 · 9/6/22 1:46pm
1865
6
Latest: 10/24/22 9:13am by

Excessively high idle

by firstvette84 · 8/22/22 6:06am
2721
5
Latest: 8/24/22 8:57am by TLAVAC

96 blend door actuator

by 96 fred owen · 3/25/22 6:50am
3091
9
Latest: 3/29/22 6:58am by 96 fred owen

Heater blows cold

by AFammo · 1/14/22 2:47am
3449
6
Latest: 3/8/22 1:06pm by lkedmiston

1990 L98 Cooling issue.

by BobPurz · 9/29/21 4:37am
4554
7
Latest: 10/9/21 8:08pm by VetteTonic

1991-1996 Radiator/Condenser Guard, AC and FansTroubleshooting

by Superc63 · 5/4/21 3:53am
1921
4
Latest: 5/13/21 7:30am by Black Shark

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

by Superc63 · 4/2/21 12:17pm
8153
3
Latest: 5/4/21 4:14am by Superc63

1990 C4 Z51 6sp - 3 Row Radiator

by grantar2 · 4/7/21 2:21pm
2061
3
Latest: 4/21/21 9:50am by DanC4-90
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