I have a 1991 riviera. I went to work in the morning the heat worked. When I went home only cold air would blow out of the vents. Any one have any suggestions? I looked for a heater control valve but could not find one? hopefully not an expensive fis and someting i can do myself?

I have the same problem, it just happened this morning. It is 0 degrees here in NY too. Have you found out what the problem is? Thanks.

I have the same problem, it just happened this morning. It is 0 degrees here in NY too. Have you found out what the problem is? Thanks. Did you ever find out what the problem was? My 91 just started that a week ago.

try checking your coolant level. I had the same problem and my coolant level ended up being low.

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