Heater core bypass
- Thread starter asrnj77
- Start date
2500avalanche
Well-known member
Re: Heater core bypass
Mine has this done to it. THe guy put a shut off switch for the heater so it can work sometime or when I choose. I know they do this on Semi trucks
Mine has this done to it. THe guy put a shut off switch for the heater so it can work sometime or when I choose. I know they do this on Semi trucks
Don W.
Stab it and steer it
Re: Heater core bypass
If yur bypassing the heater 'cuz of a leak then yes. Otherwise there is no need. In fact, IMHO, it's better with the heater to allow some circulation when cold to avoid hot spots. And in case you're wondering big trucks have bypass type t-stats so heater or no heater it dosen't matter.
If yur bypassing the heater 'cuz of a leak then yes. Otherwise there is no need. In fact, IMHO, it's better with the heater to allow some circulation when cold to avoid hot spots. And in case you're wondering big trucks have bypass type t-stats so heater or no heater it dosen't matter.
asrnj77
..hard to swallow
Re: Heater core bypass
Yes, it is because of a leak. It will be the temporary fix. I didn't read that I could cause any damage doing this. It seems that some people leave their trucks like this all the time. If there is a better way to do it, I'm all ears. How would I plug them off (assuming this is better)?
Yes, it is because of a leak. It will be the temporary fix. I didn't read that I could cause any damage doing this. It seems that some people leave their trucks like this all the time. If there is a better way to do it, I'm all ears. How would I plug them off (assuming this is better)?
simpleman01
Member
Re: Heater core bypass
I've been running a loop (bypassing the heater core) in my '82 S-15 w/ swapped in '90 4.3 for almost 8 years now. I keep putting off replacing the heater core until the dash is off for another reason - just hasn't happened yet. Aggravating not having defog function but no ill effects w/ motor that I can tell. :2cents:
I've been running a loop (bypassing the heater core) in my '82 S-15 w/ swapped in '90 4.3 for almost 8 years now. I keep putting off replacing the heater core until the dash is off for another reason - just hasn't happened yet. Aggravating not having defog function but no ill effects w/ motor that I can tell. :2cents:
Darin
New member
Re: Heater core bypass
Do not plug them off! I jsut went through this. It'll cause some serious hot spots and not allow the coolant to circulate when the thermostat is closed. I didn't pull my thermostat to look at it, but I'm guessing there isn't a small hole in them to allow some coolant bypass, it just uses the heater core instead.
My truck went from overheating to running properly with the connection of the heater core. Looping them would be just as effective.
Do not plug them off! I jsut went through this. It'll cause some serious hot spots and not allow the coolant to circulate when the thermostat is closed. I didn't pull my thermostat to look at it, but I'm guessing there isn't a small hole in them to allow some coolant bypass, it just uses the heater core instead.
My truck went from overheating to running properly with the connection of the heater core. Looping them would be just as effective.
turbodog
Donating Member
Re: Heater core bypass
I put ball valves in line with mine. I leave them barely cracked open in summer. Reduced flow in the heater (given the 17 yr old rotted gasket on the flapper door that divides the hot air from the A/C) helps the A/C blow cold. Open in the winter so my heat works.
I put ball valves in line with mine. I leave them barely cracked open in summer. Reduced flow in the heater (given the 17 yr old rotted gasket on the flapper door that divides the hot air from the A/C) helps the A/C blow cold. Open in the winter so my heat works.