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Do not reduce the flow through the bypass. The bypass keeps the flow volume up in the cooling system, and reduces the thermal cycling stresses. Chrysler engineers got this part right, and they were kind of anal about cooling systems. The LA engine had two different water pumps based on...

RO water should be pretty much free from dissolved solids. So treat it like distilled water. If you want drinking water from your well water, RO is great. Use RO water for evaporation make-up in the coolant recovery tank. Any closed system with a recovery tank loses some water to...

Hersbird: The ion exchange is a good thing in this case. Calcium carbonate and magnesium carbonate found in tap water are radiator killers. The carbonates drop out of solution and harden like concrete when the temperature goes up. They never go back in to solution either. This is the...

Rice Nuker: If you don't have the background or the materials to adjust the pH yourself, I would recommend using an off the shelf product like No-Rosion: http://www.no-rosion.com/technical.htm Use a 50/50 mix of distilled water & the coolant of your choice, then dose with No-Rosion...

Use a compression fitting that is rated for use on aluminum tube. Cut the tube back on the evaporator. Locate a stub end from a junk hose or evaporator the same diameter & type. Put the two together with a compression fitting. Would be good if you could put the joint behind the support...

Just go buy the lower hose for a 2007 Dodge Magnum with a V8. Cut what you need out of that hose, it is popular with the engine swap crowd. Picture of hose & info B.

Do you have anymore information on this "omni-directional" water pump? I have never seen any reverse rotation type pump with such an impeller. Have a picture by any chance? Since it only gets hot on the highway, save some work & just pull the shroud & electric fan clear out for a highway...

A 69 Harrison Radiator? Have it re-cored. Always easier if you tell the whole story up front. B.

'86 Ranger. Plastic tank 1 row radiator. 312,000 miles. went to the crusher with the original radiator & a rod hanging out of the block. '93 F150 Plastic tank 2 row radiator. 205,000 miles right now. Original radiator, and it runs 200 on a 195 thermostat - at 115f ambients here in Las...

You can clench your little fists & run in circles. Jump up & down. Wear a tinfoil hat. Type in all caps. Whatever. None of that will make your statement true. The so called "patent" on R12 is an urban legend. As far back as 1951, there were other manufacturers of R12. Allied Chemical...

AMA sells quality MVAC parts. The OEM tube & fin condensor can be replaced with a parallel Flow unit regardless of refrigerant. AMA Parallel flow condensor selection Use the largest unit that you can, it only improves performance. B.

A lean condition can still exist with a carb problem. A brand new hose can suck flat at high speeds. Ask yourself what parts are common to both engines - what did you just move to the replacement engine? Carb? Distributor? Balancer? .

A few things will make them overheat at speed. A collapsing lower radiator hose. The water pump just sucks it flat at higher engine speeds. If the engine cools right off when you idle, then look at the lower hose. Rev the engine in neutral & watch the hose. Stand clear of the fan...

The AC Delco part is brass stem & seat with steel body. If you have corrosion problems with any of that, then you have a coolant issue that will eat your radiator & water pump as well. B.

Snake, there is a NAPA store across the border from you in Alexandria NY. Might be time for the local car club to start aggregating parts orders & make a pick up drive one a month or more. My brother in law is in Brandon MB. They buy hard parts just a little south of town... B.

And 11 bucks on Rock Auto. How is it dealing with them in Canada? B.

Snake: When you have a part number, just go to RockAuto & put it in the part number search box. This is what I am talking about: Coolant valve Has 5/8 nipples for heater hose, not the slice & dice sharp brass stuff. Seals designed for engine coolant at operating temperature. Nipples...

Bill: The bypass type valve showed up on later vehicles where the thermostat has two valve seats. On those setups, the heater is the bypass circuit, and needs to keep flowing in the summer months. For the mopars with the big bypass hose you can just shut the water off to the heater core...

Here in the southwest it was common to add the valve from a D200 pickup to the heater circuit. A ten buck fix for summer. A/C equipped cars should have a vacuum operated valve to shut the water off to the core. The D200 part came on pickups from 1966 to 1980. The AC Delco part number is...

Ok, the static pressure at 70f should be around 70 psi, and the system should equalize with the compressor shut down. 70 low & 70 high is fine. Generally the system heating from underhood engine heat will hold the system temperature above ambient, and the static pressure will reflect this...

Everything '273 had to say above ^ plus this: What is the static pressure of the system, engine off & ambient temperature at the time of the pressure measurement? What kind of oil, and how much of it do you have in the sump on the RV2? B.

Not an inference from you kid, but a straight up statement: Unless you have had one of those heaters apart, you can't say they do contain a thermal protection device. I have in fact had one apart. There is no such device installed. The DCR on the heating element is 1.73 ohms @ 70f It...

'273: Both Ford & Cadillac did that electric defrost with the 3 phase connection. I still have CS144 alternators on the shelf with the 3 phase connector on the back. It was an elegant solution, because it kept that load off of the rectifiers. A 20 amp heater for a rear defogger should be...

Experience tells me you need more than 90 watts. I can do a reliable 240 watt 14v heater in a tube about 9 inches long. If you want to mount a tube heater, and use a flex hose in, and a second one out to the duct it would work. What diameter is the duct tube? B.

Well, at least it is entertaining... You make some good points about dirty cooling systems. Since we are using pool equipment, I suggest you use your test kit to check the pH of your discharge water, to avoid killing plants & encounters with various agencies that want to make your life...

That would have been an additional transmission oil cooler, usually part of the Snowplow package, and sometimes part of the heaviest towing package. The snowplow package included a tee fitting with a temperature sensor & "electronic monitoring system" to keep you from overheating the...

Thanks for posting that Pishta. .025 on the housing side is good. Hopefully it fits that close on the backside too. .

Look Here: http://autopartmaster.com/en/?action=catalog_show&cat=chrysler&t_id=5036&id_pic=52695 B. Edited to add, scroll down - it shows as '84 - '85 318 / 360 - with the oil cooler option.

Wow. At .300+ net clearance, that is more of a stirring device than a pump. With all of the intake uncovered on the back side, it should fit closer to the backplane than that. If this was an oldsmobile we would be welding a cover on the back of that impeller. On a 385 block ford I would...

The depth of the cavity behind the impeller is not important in this case. that is the intake side, and with that open impeller design you can't pull much head anyway. What is more important is the clearance between the blades & the cast housing. The closer they fit the better. This allows...