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I recently bought a 79 bronco with a 460. I've only driven it a handful of times but seems to run good and temp guage is always close to middle. Today I was messing with the temp control for the heater and had it on the "cool" side. The motor started to overheat and the tempt guage became almost pegged. I moved the heater control to "warm" and the guage went right back to normal range. I did this multiple times to make sure and each time I moved it to cool it would start to overheat. I am not too familiar with how the heating system works and don't really know what the cool/warm level does. Any ideas?
I recently bought a 79 bronco with a 460. I've only driven it a handful of times but seems to run good and temp guage is always close to middle. Today I was messing with the temp control for the heater and had it on the "cool" side. The motor started to overheat and the tempt guage became almost pegged. I moved the heater control to "warm" and the guage went right back to normal range. I did this multiple times to make sure and each time I moved it to cool it would start to overheat. I am not too familiar with how the heating system works and don't really know what the cool/warm level does. Any ideas?
First question is there a heater shut off valve in the heater core lines. Regardless this does sound like a thermostat issue.
It had AC but there's no compressor. The heater controls I have are the same as in the photo. What temp thermostat is recommended? I may do this and a flush since it probably needs it either way. I thought it was odd how big an effect turning the heat to warm made even without the heater fan turned on.
thanks
It had AC but there's no compressor. The heater controls I have are the same as in the photo. What temp thermostat is recommended? I may do this and a flush since it probably needs it either way. I thought it was odd how big an effect turning the heat to warm made even without the heater fan turned on.
thanks
It should not make a difference. It could be a couple of things. But at least we know it is not AC related. So again does the truck have a heater shut off valve in the heater lines. Knowing this will help determine between a blocked by pass or a bad thermostat.
Unfortunately I'm a dummy when I comes to heating systems. Is this the valve you speak of? Has a hose leading to the firewall. Is this a vacum operated valve that opens and closes the flow of coolant to the heater core?
Your truck does have a heater shut off valve. When the HVAC is set to cool the valve closes to prevent engine coolant from going through the heater core.
So with the loss of engine coolant cooling from the heater core the engine starts to over heat.
Now you never said if this was at idle or while driving.
If you are getting this issue while idling you likely are not getting enough air flow through the rad or the thermostat is not opening.
If this is an issue when you are driving then the rad may partially be blocked and or the thermostat is not fully opening.
When this is happeing is the upper rad hose getting hot ?
It seems to only be while driving. I warmed it up in the garage today and it didnt do it. Upper hose was hot but again that was at idle in the garage with normal temp showing on the guage.
Coolant is maybe a little low, about 2 inches below the cap level. At this point I think ill replace the thermostat, flush the system and add a coolant overflow bottle to make sure it topped off. Probably should be done anyway.
unless there's any other ideas?
When you discover that your engine is overheating and you cannot or don't want to stop, the first thing to do is turn on the heater in an attempt to reduce engine temp by adding add'l heat dissipating coils. This can get you to a safe stopping point or maybe even home.
Your experience seems to suggest that your cooling system is currently not up to the task of maintaining a safe engine temp. A systematic review of that system is in order. Coolant level, thermostat, water pump belt slippage, water pump failure etc. All the pieces need to be there and in good working order.
If you don't feel comfortable doing all of this, take it to someone who is. Excessive heat will eventually kill any engine.
And what's this do? It's not attached properly like many other things in this truck. Always fun finishing someone else's project
I stopped by a wrecking yard and was able to see that this is connected to the warm/cool lever and must work in conjunction with the valve to control heat? Mine doesn't appear to be hooked up on the other end.
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