Instructions on how to fabricate a car heater from used heater core w/self contained blower???

WE HAVE AN OLE RATROD MODEL -A  TRUCK AND WANT TO KNOW IF ANYONE HAS EVER SUCESSFULLY MADE THEIR OWN HEATER UNIT USING THE ENGINE COOLANT INTO A OLD HEATER CORE AND WITH ITS OWN BLOWER MOTOR THAT JUST HEATS AND RECURCULATES INSIDE AIR???  THX THUMBBUSTER

rickharris5 years ago
I was answering the question - indicating you need to examine a standard car heater system.

You will need to visit a scrap yard and extract the heater core from a suitable car or pickup.

Exactly how you connect it will depend a lot on your engine - cooling system layout but you need to insert a T connector in the heating line on the outlet side of the water pump - This feeds the heater core via a valve - This can be a simple ball or gate valve suitable for use with domestic hot water systems.

The other side of the heater core goes to a T connector on the radiator inlet side to return the water to the cooling system.

It is important NOT to put the heater in series with the cooling water or when you turn it off you shut off the cooling system.

Where you place the air blower is up to you. I would suggest it is better to draw in outside air as the engine provided plenty of heat.

Several pictures of car heater systems here https://www.google.co.uk/search?tbm=isch&hl=en&source=hp&biw=1920&bih=960&q=car+heater+system&gbv=2&oq=car+heater+system&aq=f&aqi=g1g-mS2&aql=&gs_sm=3&gs_upl=1676l4763l0l5056l17l17l0l1l1l0l123l1520l14.2l16l0&gs_l=img.3..0j0i5i24l2.1676l4763l0l5057l17l17l0l1l1l0l123l1520l14j2l16l0

like this one.
rickharris5 years ago
That's how most car heaters work?
thumbbuster (author)  rickharris5 years ago
but that doesnt answer the question...wasnt asking how they work... I was asking if you or any else has seen plans or instructions on fabricating one for a ratrod or street rod with out having to by a ready made for 200-300.00....thank you

i'm in the middle of this project in my JeepSpeed project. I'm using the heater core from the original vehicle, a 97 jeep XJ (cherokee).

the heater core is 7" square heater core, with 1/2" copper in and out. i'm using a 7" diameter electric fan from eBay, which came with "radiator zip ties", as i call them, to easily fasten the fan to the core. following are a couple considerations i'm working out.

1. i would like to mount the core horizontally, just underneath the window, above the trans tunnel, so that i can defrost the window (i'm in NY). However, I think this might create an air pocket as it would be the highest point in the coolant system, so i will probably mount it level with, or below, the radiator cap

2. at first, i thought about using a pigtail which could be plugged in either orientation... but upon consideration, i'm going to use a reverse switch, which switches polarity (fwd, off, rev) to enable me to switch the fan direction (possible with DC motors, no problem), and have not decided yet if i'm going to then wire a potentiometer to control fan speed. will decide if it's obvious i need to turn it down, and not just off.

3. i'm using electrical conduit to shape the contours of the dash, and tacked mesh sheet metal to create the panels. this way air flow is totally maximized, as without any ducting the hot air might dead-end or choose a patch of least resistance that doesn't accomplish what i would like.

4. i'm plumbing with heater hose, using barbed brass fittings and hose clamps. i'm plumbing an inline shutoff 1/4 turn valve in the inlet side plumbing, so i can stop the coolant from entering the heater core, as it gets hot and humid here in the summer, and i would prefer less heat freely radiating from a naked core during those months.