box hvac

Covering this yet again (because I got PM's about it last time). If you are replacing the heater valve (likely due to leaking), do yourself a YUUUGE favor and replace the heater core also. I now replace the original core with a Lada unit from "LADA POWER". They are $25 spank'n new, the correct...

I just finished replacing the heater valve in my 85 X1/9 with AC Heater box. I'll start off with saying that was a nightmare of a job due to two things. One, the location of the old valve is a royal pain to get to, makes the paddle box look like easy access. Two, a OEM replacement valve is no...

I watched @markx19 (Mark Weinberger) latest short video on his "Green Machine" series number 20 where at about 1:00 in he shows reinstalling a fan shroud for the early year non-AC heater box. I've just recently done mine (thanks again to @Mark Olson for the upper box!) and I did not see this...

The heater core in the AC equipped X is different from the non-AC core. My AC heater core is now leaking from the core portion so I'm looking for options. New AC style cores do not seem to be available (at least not that I could find). So I'm looking for other possible replacements. There's a...

I have been reworking my heater box, and I guess I should have taken more pictures but I can't seem to see where the wiring for the heater fan is supposed to exit the heater box, unless it comes out with the radiator outlets. As you can see below right now it is coming out of the vent hole...

I've been working on the cooling system of my X lately. I replaced the radiator with a MWB aluminum, water pump with a GMB stamped impeller and a new thermostat. Brought it up to temp at idle and all is working perfectly. Temp stabilizes just under 190F and the fan kicks on one tick above...

Hello, my endeavor continues. I would like to buy fans that are more efficient than what is in it currently, if something exists. I would like the fans to fit on the stock brackets or come with brackets that fit in stock locations. Thoughts? 1986 Bertone X1/9 Mike

I am looking to remove the lower part of the fan box and need to disconnect the 3 wires to the fan. I have found the connections for red one and the blue/black one. Could someone please tell me where you disconnect the black wire (ground?) so the fan box can come out? Does it disconnect down...

My original heater core start leaking. I was inspired by the post of Tim,Todd and Jeff an they convinced me to pull the trigger for a brand new Fiat 24 heater core from our suppliers. Last weekend I remove the heater box from the car to work on it on the bench. There's some pictures of the...

I'm getting ready to splice the Fiat cooling system w/ the Chrysler 2.2 TII, using a Davies Craig electric pump. The Fiat cooling system seems to be VERY busy, especially at the thermostat housing. If I could figure out flow direction thru each of the components it may make my job easier. I've...

Was seeing some suspicious cooling system behavior, so last night I got under the front of the car to look. As it turns out, I smelled the problem before I saw it. Had some seepage coming from the upper corner where the nipple for the inlet hose is welded to the tank. Could be a failing weld...

Hi folks, Need opinion, my stainless steel reservoir seeps at inlet joint solder pipe return tank, I can feel a crack with my fingernail. My tank was chromed 7 years ago. I want to fix by myself and was thinking to use brazing SSF-6 Silver solder rod from Muggy Weld...

From a Maserati BiTurbo: https://www.ebay.com/itm/Maserati-Biturbo-VACUUM-OPERATED-HEATER-VALVE-315520030/173160466958

I had the car idling sitting in the driveway last night working on the wiring for my gauge cluster when all of a sudden the heater core decided to spring a leak. I've read the threads on taking a 124 core and cramming it in the stock heater box. I really don't want to have to modify the box...

I now have the nonAC heater box all put together and ready to install. I ended up using the spider heater core and modifies the heater box. First I ground off the heater core support tabs and flipped the cable support just like everyone said. Than I machined off about 3/8 of an inch from the...

On Friday, I was just getting ready to get my car insured and registered when I noticed a couple of small puddles under each end of the radiator after getting the car fully warmed up. I pulled off the grille and I could see some blueish corrosion on the connections between the core and each...

Folks, I recently posted a thread in Workshop forum asking about replacement heater cores. @Jefco suggested a 124 core with some customization to the heater box. He posts pics of the size differences here I used it as direction and did the following: I bought a core from VicksAuto Removed the...

Wondering if anybody has tried the 1" copper "slide thru" the original in coolant pipes under the car with good results? I've seen it done here on the forum and just wanted some feedback with regards to success rate? Removing the box and fab'ing new stainless pipes at this point isn't even an...

I've been away from my X and this forum for a few months but now have decided to tackle replacing a leaky heater control valve and/or heater core. I have some awesome new carpet and upholstery from Henk to install so now I'm motivated to stop the coolant drip on the floorboard! But I am...

Hi, Does anyone have pics showing how the pipes are attached inside the tunnel? I would like to try cutting them short and pulling them out towards the front, then pushing new pipes of the original ID back through. I would like to visualize what I am dealing with before I start. I found old...