Tampa 928s

Hook up a mity vac and see if the arm pulls in, the Vac line is going into the firewall on the drivers side reachable with air cleaner off. If it pulls in and air is cold this is not your problem. You also have a Temp sensor in the alternator hose, mine was bad causing the same issue. With pass side footwell off open the connector with 2 yellow wires use a meter should read around 300-400 Ohms to test sensor. You could add a T after your check valve to supply Vac all the time this will close it. If you add it to the brake booster vac hose when you floor it you will get a blast of hot air. Under the Driver foot well all the hoses meet you can nut each one, get a supply of connectors and test with the vac tool you mat find one or more bad ,leaking vacuum.
Good luck I finished mine a little while ago and the air is fine!

sfierle

Once again, thanks everyone. It looks like have a lot to look at. I will update when I find the issue.

AO

HVAC can be a real PITA!

rcoble

If you feel brave, while your in there, you could do my modification to the heater valve. Gets rid of that blast of hot air when you return to you car after a short stop. (makes the defalt position of the heater valve 'off').

https://rennlist.com/forums/928-forum/275012-new-hvac-mod.html

bd0nalds0n

That is one bitchin' mod. Next time the supercharger has to come off, I'm going to have it done.

9two8

Hi sorry to hi-jack this post, but could you tell me if these instructions apply to the 1980 928s aswell as the s4,.... or is there seperate instructions for this MY

Thank,s
Ken
80 928s manual
94 Pajero 2.8 Exceed

rcoble

those instructions (descriptions) Look the same as my 80