Question about Cars & Trucks
Keep looking - there isn't a shut-off valve for the heater core. Water flows through the all the time. The only time you get heat is when you set the controls for it and then cabin air is routed through the core. All other times it bypasses it. If you have a leaking heater core, in most cases you can remove the heater hoses at the firewall and using a hose adapter available at any hardware store with a couple clamps, you can make a bypass loop of the core until you can get it replaced. Of course you have no cabin heat until you repair or replace the core. It is not recommended to stub off the ends of the heater hoses because on some vehicles, that loop provides other cooling functions such as cylinder heads, etc. That is why looping it is the safer choice.
Posted on Dec 06, 2016
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Posted on Jan 02, 2017
The heater core is on the passenger side under the dash within the heater airflow contoller box. If you had Xray vision and could look straight through the glovebox, then you would see it. The heater control vale for the water flow is on the passenger side top of the engine near the firewall. It will have a domed top with a vacuum line to it and it is placed into the heater core supply hose.
Posted on Sep 07, 2009
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No heat is often a symptom of low coolant, usually followed by overheat. There are other controls that regulate heater, but right now, re-fill the cooling system with engine running and heater on high, then check for leaks (coolant you lost went somewhere...you need to determine where) Low coolant will damage your engine. Take care of that first, then if heater still does not work, then do diagnosis on that. (if you loose the engine heat won't matter, will it!)
Posted on Sep 22, 2009
Testimonial: "Very helpful! And I appreciate the input very much!"
I installed a heater core in a 2004 Chevrolet and need to know how to hook up the vent cables (1 goes to the left and 1 goes to the right) for the back of the control knobs. Do they screw in or a are snapped in cant tell.
Posted on Jan 18, 2010
This is a very common problem with the 94, really common with the LT1. I have done everything I can think of with my Caprice, and lets just say I don't drive it in the winter anymore.
Posted on Jul 17, 2010
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