1990 Chevrolet 1500 Pickup Q&A
1990 Chevrolet 1500 Pickup Question: Defrost/heating question
I actuallu have a 1988 1500. I cannot get air flow from the heater or AC into the middle dash or wundshiled defroster. I have removed and tested the AC Actuator and the Temp Actuator and they are both working. The vent that I can see through the opening for the factory tape player is closed and I can't get it open. I have literally torn this dash apart and cannot figure out the problem. - chev88
I would subscribe to www.alldatadiy.com for your Chevy truck. here you can get all of the factory info with the HVAC diagrams, so you can trouble shoot which vacuum motor is not working or which door is jammed. It will cost $26.00 for a 1 year subscription for your vehicle's info. Best of Luck! Actually, you often have to completely remove the dash from a vehicle to repair heating and ventilation problems because it is the only way to really access all the components. It makes HVAC a tough repair in most cases. - dandd
ck vac hose going into fire wall from under hood - delane 72 garage and body shop
I ended up tearing the whole dash out(big job) and found that the door to the vent and the housing were stuck together. after freeing them up and cleaning said parts it all works fine now. - Visitor
One or more heater & AC (HVAC) air delivery and/or temperature mode door actuator may fail. This can result in incorrect air delivery or temperature. If this occurs, fault code(s) stored...
my vent wont switch to defrost or any other position all functions work ac heat just wont switch from vent where are actuators located at on this truck
have new thermostat,allhoses are hot in and out of heater core plus heater case under dash. just blows real cool air
First my heater only worked on high, so i changed the resistor. And it was working on all the speeds. Then I noticed that when i try to put it on defrost only or to change the settings it doesn't ...