In my 1993 Z28 Chevrolet Camaro the a/c does not blow cold air. Also the deforst blows strong but does not clear the windows and in the winter it does not blow hot air. The air always blows strong.
My Camaro's are all victoms of the air flow control vaulve. My 77 had a cable that phyisically opened and shut off air flowfrom the heat and cold side and operated as I moved it from cold to heat. Then they came out with Vacuum assisted air control units that when the rubber vaccum tube dehydraded, it would be stuck in what ever it was in last, say A/C, or if u had the heater on that day. You have either cables or air hoses that open and close certain doors under your dash according to where you place the enviromental control to. 9 times out of 10, that control mechinisim froze up, a plennum door could have broken off leaving that area always open and the heater is always off. Check the book, im not 100% but it may be all electronic in the 93's if so, first check your fuses. Also check the passenger floor board for dampness. If the passenger floor board is wet, then your heater core ruptured also. It's a mini radiator under the pass. side dash. But the real deal is the air vents that open and close according to your input are not moving at all, and if they are electronic well Don't rip the dash out, that is a pain to reinstall LOL, Best bet is to take it to the chevy house because if you get the book, u'll see theres quite a few moving parts and with old plastic and them dehydrating, you can easly brake a door control and make matters worse. Good luck.
SOURCE: Heater blows cold, temp gauge rises
heater core is probably what was changed,..a little radiator under the dash that the hot water runs through and a fan behind it to blow at it thus giving you heat,...pretty much thats it in a nutshell,...sounds like something still leaking under there, (anti-freeze smell),... fill it back up with anti-freeze (non-toxic type so you don't polute) and drive to where you gotta go,....go to your mechanic to find that leak,.good luck, and do a hole shot for me! thanks, cracklin joe
SOURCE: Temperature gauge fluctuates and the heater blows cold air
Definitely check your fluid level in your radiator. Top it off all the way. I've seen that happen multiple times on cars that were low on anti-freeze. If that doesn't work try replacing your thermostat. It's cheap and the easiest place to start if topping off the fluid doesn't get you fixed up.
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