run's hot with a/c on

[GSC69]

hello . i have a 1988 corvette . when i turn the a/c on the car starts to overheat . when im on the highway it seems fine ! this only happens at lower speeds . i cleaned out the space between the rad and condensor thinking it was an airflow problem . i also checked the line presures . and everything is where it should be aney sugestions !! thanks !.... cheers

[ChuckG]

Do you have the Z51 or aux cooling option?

Sounds like your fan(s) are not coming on. Maybe verify they are--and verify you have plenty of fresh coolant.

On the very hottest days with the AC going full blast, I never see 220.

[GSC69]

hey there ! yes the fans come on reguarly and the coolant is full . the car doesent overheat with the a/c off ! any other sujestions .. cheers

[ChuckG]

Hmm. That's a tough one. So many variables.

You could have a bad temp sending unit, bad connection thereto.

Have you considered a couple bottles of Water Wetter?

[LLC5]

Originally Posted by GSC69

hello . i have a 1988 corvette . when i turn the a/c on the car starts to overheat . when im on the highway it seems fine ! this only happens at lower speeds . i cleaned out the space between the rad and condensor thinking it was an airflow problem . i also checked the line presures . and everything is where it should be aney sugestions !! thanks !.... cheers

What are your coolant temps when you are overheating? Have you boiled out any coolant?