Heater not working
#1
Heater not working
My heater blows luke warm air most of the time now and im wondering if it might have something to do with me changing the thermostat. Truck runs same heat but colder heater now. Burped the system with truck jacked up. Could air be in the heater core somehow? and if so how do i get it out
88 pickup 22re
88 pickup 22re
Last edited by oregonducktaylor; 01-14-2017 at 05:13 PM.
#2
Registered User
iTrader: (-1)
My heater blows luke warm air most of the time now and im wondering if it might have something to do with me changing the thermostat. Truck runs same heat but colder heater now. Burped the system with truck jacked up. Could air be in the heater core somehow? and if so how do i get it out
88 pickup 22re
88 pickup 22re
The surefire way to purge the air is with the right tool. lisel makes a large funnel that attaches in place of the radiator cap.
Start with a cold engine, remove the radiator cap, raise the front end so that the radiator cap opening is higher than the heater hoses on the firewall, set the heater valve(s) to hot, start the engine and let it idle till the thermostat opens and you see flow across the radiator. Then keep the radiator full as needed while it purges air..
Lots easier with the special funnel, or at least less stressful.
#3
Super Moderator
Staff
iTrader: (1)
Join Date: Aug 2008
Location: Anderson Missouri
Posts: 11,788
Likes: 0
Received 21 Likes
on
19 Posts
I would also check and see if the hoses are hot after the truck is running for awhile and you know it is warmed up. If hot water is flowing thru the core, then the heat is not getting transferred from the core to the cab. Could be build up inside the heater core or the core can be full of dust not allowing the heat to transfer.
Does your truck have AC or not? I have seen a truck that did not have the AC and the dirt goes straight from the blower to the heater core and fill the fins full of dust, there by not allowing heat to transfer.
Does your truck have AC or not? I have seen a truck that did not have the AC and the dirt goes straight from the blower to the heater core and fill the fins full of dust, there by not allowing heat to transfer.
#4
I would also check and see if the hoses are hot after the truck is running for awhile and you know it is warmed up. If hot water is flowing thru the core, then the heat is not getting transferred from the core to the cab. Could be build up inside the heater core or the core can be full of dust not allowing the heat to transfer.
Does your truck have AC or not? I have seen a truck that did not have the AC and the dirt goes straight from the blower to the heater core and fill the fins full of dust, there by not allowing heat to transfer.
Does your truck have AC or not? I have seen a truck that did not have the AC and the dirt goes straight from the blower to the heater core and fill the fins full of dust, there by not allowing heat to transfer.
#5
Registered User
Join Date: Nov 2016
Location: Taos New Mexico
Posts: 44
Likes: 0
Received 0 Likes
on
0 Posts
*I had the similar issue with my 85 and 83 turned out that before I bought them the trucks were sitting out in fields [Rural living] and pak-rats had nested up inside air ducts, the various types of debris clogged everything. I took dash and venting apart cleaned it out , solved problem.
If burp,n the system doesn't change it ....might want to look into this .
If burp,n the system doesn't change it ....might want to look into this .