Ohjai Posted August 5, 2023 Share Posted August 5, 2023 Took my wonderful ride out for some fish and chips, but the dash vents quit blowing any air. Cold air is coming out of floor verts and the defroster vents on the windshield. What do I have to do to get it blowing like it did a yesterday. Jim Link to comment Share on other sites More sharing options...
Ronnie Posted August 5, 2023 Share Posted August 5, 2023 When the A/C programmer loses vacuum the default setting for the airflow is air coming out of the defrost vents. Might a bad vacuum line? They tend to rot near the cruise control servo. Did the cruise stop working to? Here are some places to check: 1 Link to comment Share on other sites More sharing options...
Ohjai Posted August 6, 2023 Topic Author Share Posted August 6, 2023 Thanks Ronnie. I have a line that is just hanging loose, but I don't know where it connects. Link to comment Share on other sites More sharing options...
Ronnie Posted August 6, 2023 Share Posted August 6, 2023 I don't recognize what you are showing in the photos. Maybe something unique to a '90-'91 model? However, I do see a bad vacuum hose connected to the fuel pressure regulator. (Blue arrow in photo below) That tells me more vacuum lines may be rotten and need replacing. 1 2 Link to comment Share on other sites More sharing options...
Ohjai Posted August 6, 2023 Topic Author Share Posted August 6, 2023 Good eye Ronnie. I will fix that. I will put it on my list to change all the vacuum lines. I found my culprit. The round connection I was holding in my hand, is one end of a broken vacuum T fitting. Looks like about a 3/16 line feeding 2 1/8" lines. I have some super glue curing now, hopefully my patch fix will work until I can get a real part. I will put some pictures after I have the task completed. Link to comment Share on other sites More sharing options...
Ronnie Posted August 6, 2023 Share Posted August 6, 2023 Ok, now I think I know what it is. I didn't recognize it the way you were holding it. It's a Tee but it's also a check valve so don't replace it with just a plain Tee fitting. Glad you found the problem. 1 Link to comment Share on other sites More sharing options...
Ohjai Posted August 6, 2023 Topic Author Share Posted August 6, 2023 Thanks Ronnie. I have it fixed. I will try and find the part in the parts book and get a new one. But in the meantime I fixed this one and the AC is working properly. 1 Link to comment Share on other sites More sharing options...
Ronnie Posted August 6, 2023 Share Posted August 6, 2023 Your looks a little different from what I thought but it's probably also a check valve. Glad you got it working. 1 Link to comment Share on other sites More sharing options...
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