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01-23-2018, 03:58 PM
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#1
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Senior Member
Country Coach Owners Club
Join Date: May 2016
Location: Fort Worth, TX
Posts: 230
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Over the road heater not working
I have a 1999 Affinity and my over the road heater blows cold air. The cable control is working fine but no hot water is getting up to the heater core (both hoses are cold). I found the forward supply pump and jumpered 12 volts to it and it runs fine. In the rear, I found the "T" in the supply line from the motor but can't find the rear supply pump. Does anyone know what provides the signal for the two supply pumps to run? I was told by country coach that they are supposed to run all the time the engine is running. I've searched both fuse panels and no blown fuses.
On another note, while under the dash, I noticed that I am getting hot water to the front Hydronic heat exchanger with the motor running. The manual is vague on whether the fans can be operated without firing the Webasto unit. The manual says to set the thermostat to furnace, interior heat exchangers to on but the fans won't blow. Can anyone shed some light on this? I wouldn't need the over the road heat if I could operate the hydronic fan units. I hate to burn diesel through the Webasto if I'm already getting heated coolant from the engine.
Thanks,
Jim
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01-23-2018, 04:11 PM
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#2
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Senior Member
Join Date: Nov 2012
Posts: 1,293
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Our OTR was being used for heat and we started getting smoke from the outlet. Turned out to be a bearing on the motor.
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Wally & Elta Mae
2007 Allure 470 Sunset Bay #31535
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01-23-2018, 04:28 PM
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#3
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Senior Member
Join Date: Jul 2007
Posts: 1,172
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The coolant boost pumps are wired to run anytime the ignition is on for my 2000 Magna. I've rewired them and use a relay with a switch I added to the dash to turn them off if I desire.
On my Magna, the rear boost pump is above and forward of the engine and above the transmission. If this is a used coach you bought it could be that a previous owner removed the rear pump. These coolant boost pumps are known to leak, especially the one above the engine. I've replaced the one above the engine on my coach.
I run the interior heat exchangers when traveling in cold weather. I turn on the heat exchangers but do not turn on the furnace. I then set the thermostat to furnace for both zones and set the desired temperature.
I have a Hurricane furnace, not unlike the webasto, and it heats my water in the water heater while I drive.
__________________
Pete - Full Timing
2000 Country Coach Magna 40' Indulgence, CAT C10, #5892
2019 Ford Ranger XLT
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01-23-2018, 04:56 PM
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#4
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Senior Member
Country Coach Owners Club
Join Date: May 2016
Location: Fort Worth, TX
Posts: 230
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Quote:
Originally Posted by phays
The coolant boost pumps are wired to run anytime the ignition is on for my 2000 Magna. I've rewired them and use a relay with a switch I added to the dash to turn them off if I desire.
On my Magna, the rear boost pump is above and forward of the engine and above the transmission. If this is a used coach you bought it could be that a previous owner removed the rear pump. These coolant boost pumps are known to leak, especially the one above the engine. I've replaced the one above the engine on my coach.
I run the interior heat exchangers when traveling in cold weather. I turn on the heat exchangers but do not turn on the furnace. I then set the thermostat to furnace for both zones and set the desired temperature.
I have a Hurricane furnace, not unlike the webasto, and it heats my water in the water heater while I drive.
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Phays, do you remember where you picked up the circuit when you rewired and added a relay to the coolant boost pump?
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01-24-2018, 12:44 PM
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#5
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Senior Member
Join Date: Jul 2007
Posts: 1,172
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My coach had a burglar alarm that I did not use. I used the burglar alarm relay in the front run bay to control the boost pumps.
I removed the pump wire (#134) from the 20 amp fuse on the front run board and attached it to one side of the relay contacts and ran another wire from that 20 amp fuse position to the other side of the relay contacts. On that relay those wires are connected to positions 30 and 87. I then used an additional wire that I ran from the 20 amp fuse position and attached it to one side of the coil on the relay to provide +12 volts to the coil, either positions 85 or 86. I connected wire #263 from the original burglar alarm circuit to the other coil position. Wire #263 goes to the burglar alarm switch under the dash and above the driver's right foot. I wired the switch to ground so that when the switch is turned on, the coil circuit is complete to ground and the relay is activated.
Wire #263 originates on the domestic fuse panel in the electrical bay. I pulled the fuse so that it would not receive power from that panel.
There are spare wires from the front run bay to under the dash if you want to try and use them but good luck in finding them.
__________________
Pete - Full Timing
2000 Country Coach Magna 40' Indulgence, CAT C10, #5892
2019 Ford Ranger XLT
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01-25-2018, 12:49 PM
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#6
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Senior Member
Country Coach Owners Club
Join Date: May 2016
Location: Fort Worth, TX
Posts: 230
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Very clever! I found wire #134 and it was coupled with wire #78. I also found that the fuse was blown. I disconnected 78, unplugged the front pump and installed another fuse but it blew as soon as I turned the ignition on. The problem must be a bad rear coolant pump but I cannot find it. I found I had two identical pumps for my Webasto heater and also discovered the front and galley blowers for the webasto are not working. Problem there is no 12v signal from the relays. Do you have any idea where the webasto relays might be located? The schematic says they are in the central electrical bay but I cant find them either. CC has not been much help.
Im about to just run new wires and manual switches to run everything when I want to. Thanks for your input!
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01-25-2018, 04:30 PM
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#7
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Senior Member
Join Date: Jul 2007
Posts: 1,172
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Aroadracer,
On my 2000 Magna, wire #78 goes to the heated mirrors. As mentioned, if you had a rear boost pump perhaps it was removed by a previous owner. Look for a corrugated conduit with two wires that may not be connected to anything. I have a CAT C-10 in my coach and the pump is just barely behind the forward wall of the engine opening in the bedroom.
Also, look to see if there is a short coolant hose that has been spliced into a coolant line. When my rear pump failed my temporary fix was a short piece of hose installed to bypass the pump. If you find a splice it may be that pump was removed.
My coach has a Hurricane furnace and I'm not aware of relays.
You might try asking your questions in the Yahoo Country Coach Owners group in the Yahoo forums or try calling Kevin Waite 541-953-6162. He's an ex CC employee and runs a mobile service in Oregon.
__________________
Pete - Full Timing
2000 Country Coach Magna 40' Indulgence, CAT C10, #5892
2019 Ford Ranger XLT
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01-25-2018, 05:28 PM
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#8
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Member
Country Coach Owners Club
Join Date: Jan 2013
Location: Vail, AZ
Posts: 60
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Quote:
Originally Posted by Aroadracer
The problem must be a bad rear coolant pump but I cannot find it. I found I had two identical pumps for my Webasto heater and also discovered the front and galley blowers for the webasto are not working. Problem there is no 12v signal from the relays. Do you have any idea where the webasto relays might be located? The schematic says they are in the central electrical bay but I cant find them either. CC has not been much help.
Im about to just run new wires and manual switches to run everything when I want to. Thanks for your input!
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Jim,
My '00 Affinity is the 42' w/ tag and C12, so may not be identical to yours, but most of my input aligns w/ what phays has seen too. My rear boost pump for OTR heat is up high, just slightly in front of the engine. Mounted up inside the chassis rail, kinda near the air suspension relay/valves. Not easy to see unless you're crawled under looking for it with a flashlight. I never knew it was there until I was following coolant lines to see where they went.
I seem to recall the Webasto related relays are in that central electrical bay, and I think they were up on the ceiling or high on the back wall inside a bud box or something like that where the cover had to be removed. When I had a Webasto circulator pump blowing fuses, I think I found it up there and recall it was a pain to access. I should have time to look at mine this weekend if you still need help finding it. If the front & gallery blowers aren't coming on, also verify that the hydronic switch in the front is set to on and that the zone 1 thermostat is set to 'furnace'.
Regarding your question of using the hydronic heat without firing the Webasto; I don't think there is a way to tell the Webasto not to fire in my coach, but once the coolant is hot from the engine, the system will work without firing the Webasto. Turn on hydronic heat exchanger switches, the blower knobs, and set thermostats to 'furnace'. If I understand how the Webasto system works, there is a thermostat on the Webasto measuring the fluid temperature at the Webasto. Below a certain temperature the Webasto will fire up the burner to heat the fluid (heat exchanger). Above that certain temperature, it keeps circulating the fluid, but the burner is off. Once the engine heat is up to operating temperatures and circulating through the Webasto, the thermostat won't call for extra heat and the burner will not fire. In that sense, you're using the hydronic heat system throughout the coach without burning additional fuel in the Webasto burner. I think that's the long winded way of saying what phays says he does as well, but it sounds like his Hurricane has an additional switch to control the furnace separately from the heat exchangers, whereas when I turn on my heat exchangers, that also turns on the Webasto. Note that everything in this paragraph is speculation. I haven't gotten the whole Webasto and hydronic system fully understood yet.
__________________
2000 Country Coach Affinity #5695, 42' double slide Bed & Breakfast
All-electric, 455HP Cat C-12, tag axle
Tucson Arizona
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01-26-2018, 06:20 AM
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#9
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Senior Member
Country Coach Owners Club
Join Date: May 2016
Location: Fort Worth, TX
Posts: 230
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So, I did a work around to get me through my trip next week.
First, I ran a separate circuit with a switch to run just the front coolant pump. I finally have hot coolant going through my heater core.
Second, I ran a second circuit to the living room hydronic blower. This will give me the option of additional heating while driving without turning on the webasto.
Ill keep looking for that rear coolant pump as time allows and when I get some ramps made to ease the access. I can see a metal pipe coming back from the engine and there is a T in it. From the T, one hose goes to the webasto pump in the rear compartment and the other hose goes forward through the wheel bulkhead with no splices. Its got me stumped.
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01-28-2018, 10:44 AM
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#10
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Senior Member
Country Coach Owners Club
Join Date: Jan 2006
Location: Northern California
Posts: 5,847
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FWIW, I removed the rear coolant school bus pump from my rig about 10 years ago and still have otr hot water and dash heat just using the front pump.
But we do not travel where the temps are really cold.
That rear pump was replaced once and leaked severely a third time while we were traveling. It's presence ended there.
Mine was on the driver side forward of the engine near the inside of the frame rail.
__________________
Dean
1995 38' CC Magna #5280 **** Sold after 21 years of enjoyment.
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