Question about 1999 Chevrolet Silverado 1500
No Heat. Blows really good and has plenty of air but doesn't get hot air. I was thinking that the heater core is plugged. or controls on the dash are not working. I also have a check engine light that comes on at speeds over 70 mph. Code reader says that engine misfire. (intake gasket?) Could these be related
They could be related but most likely not. There are two water lines which go back to the firewall from the radiator. On one of those lines is going to be a controller that is cable or vacum controlled. If it has a vacum line you need to check the vacum pressure at the connection using a vacum pump. You want to make sure that valve is opening and closing accordingly. If it isn't then your heater will not work because no water is getting to the core. In this case you will need to isolate the vacum leak back to the source of the problem. If there is a cable connections make sure the cable moves freely and in sync with the cab control. If not replace the cable. Assuming the radiator is full this valve is the next place to look for a fault.
Posted on Sep 23, 2009
Well i wood open the hood and see if heater hose at bulk head are hot both of them if they are then i would see if my blendoors are moving under dash at heater box when you move the controller if they are not moving could be controller or vacuum leak if you have vac-um leak from in take it could cause a miss or if you have low coolant and it leaking in at intake could couse miss any way hope this helps
Posted on Sep 23, 2009
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Posted on Jan 02, 2017
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Mar 05, 2017 | 1992 Mazda 929
To troubleshoot this types of problem,click the link below
--------Go through the procedure to confirm the issue.
Engine Overheats and heater blowing cold?
Heat blows cold on drivers side and hot on passenger side?
This will help.Thanks.
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