I replaced my pressure switch with one that has a emergency low pressure off switch.

Do not know the age of or RV Manufacturer but it is likely a pressure sensor in the plumbing system that activates it to supply water as the pressure decreases in the system. You likely should contact an RV savvy technician or a competent electrician to possibly bypass the water pump pressure control switch..

I flushed my heater core by taking the heater hoses off the heater outlet and inlet and taking a garden hose and run water under low pressure for about a minute on both hoses going into the heater and mine cleared right up. Good hot air after that. I had to take some anti freeze out of the rad so I wouldn't loose fluid when I took the hoses off. This worked for my car.

Basic Issues As an electric-powered washer, a circuit overload may cause your Husky 1600 to shut down or prevent it from starting. In this case, check your home's electrical service panel for a tripped breaker or a blown fuse -- the 1600 requires a dedicated circuit rated at a minimum of 15 amps. To prevent a blown fuse, avoid using other large devices on the same circuit as your washer. If you use an extension cord, it must be rated at 15 amps as well. Before moving on to more complex troubleshooting measures, check the gun safety trigger and release the lock if your 1600's trigger will not move. Water Woes Releasing air from the pump serves as a simple fix for low-pressure water output; remove the wand and allow the washer to run as you depress the gun's trigger until the water output normalizes. If your water output seems to lack detergent, ensure that the clear tube is securely connected to the detergent nozzle. Likewise, check the connected water supply and make sure the faucet is fully open and that there are no kinks in the hose to ensure optimal pressure. Using a shorter garden hose makes for stronger pressure, as well -- Husky recommends a hose with a maximum length of 50 feet for a city water supply. Clearing Clogs If your Husky 1600's pressure seems lacking or its water flow is obstructed, clean the nozzle by removing the wand from the gun, clearing the nozzle hole of obstructions with a stiff wire and flushing the nozzle with clean water. Similarly, clean the washer's inner water screen, located behind the garden hose connector, by removing the screen and flushing it with water. This also corrects low or irregular pressure and may remedy a unit that does not stop releasing water when the trigger is released. Model HD1600 features a chemical solution reservoir with a similar screen; clean this screen in the same fashion if you experience chemical intake issues. More to Consider If your power washer issues go beyond troubleshooting basics, contact Husky's customer service department at 800-381-0999. Husky recommends contacting customer service when your 1600 has problems with its pump, bypass valve, discharge valve or manifold assembly, for instance. Because this series of powerwashers was originally offered around 2001 through 2008, Husky's one-year limited warranty no longer covers the cost of replacement parts or repairs.
Sponsored Links

78 olds uses a push and pull water controle on the heater hose. Make sure that the cable is working the water valve on.the heater hose. If it is working the valve back and forth then its most likley your heater core stopped up.. take both heater hoses off at the motor. Take your garden hose and flush water threw heater core. USE LOW PRESSURE.. DO NOT TURN YOUR GARDEN HOSE.ON FULL BLAST.. IT COULD MAKE THE HEATER CORE TO START LEAKING IN SIDE YOUR CAR. With.low pressure run water in each.heater hose.till water coming out looks clean. If this dont get you heat. Then check.your thermastat it may be stuck open.

Assuming that the flow control is not defective, your water heater may be limed shut.
Heating water (especially 'hard' water) causes calcium to precipitate out and build up in the bottom of the tank which can cause poor recovery and if heavy enough, reduced flow.

Check yours and you should find a drain located near the bottom of it.
Attaching a garden hose to this and opening the provided valve will allow you to flush out the loose lime.
You should turn off the AC or gas supply before doing this to stop the heater from trying to reheat while you are emptying it.

Good luck-

drain coolant system locate heater cores hoses going through firewall you need to buy the radiator flush kit at any auto parts stores. remove heater cores hoses from one end or buy extra long heater hoses same size as heater core hoses in vechicle at auto parts store use the flush kit when you flush through one of the heater core hoses let the other hose drain in a drain pan when you use home garden hose use low water pressure dont use garden hose to the max or you will rupture heater core. your best bet let radiator shop flush whole coolant system. because heater cores hoses are in a tight spot.make sure engine off if you just going to flush out heater core only .after flushing heater core good time to replace heater core hoses.if job too hard or complicated let radiator shop flush out radiator the engine block and heater core because if radiator stopped up or engine block stopped up the gunk and rust will reenter plug up heater core.if you tight on money you can flush out your own radiator.drain out radiator using large drain pan. remove top radiator hose and remove bottom radiator hoses connect to water pump.use garden hose with flush kit part with water pressure not too high put garden hose to top radiator hose run water until clear water run out bottom radiator hose in drain pan,the flush out engine block remove thermostat.if you had another spare thermostat housing with RTV SILICONE SEALANT THAT HAS SET UP INSTALL THERMOSTAT HOUSING BACK TO ENGINE WITHOUT THERMOSTAT FLUSH OUT THE ENGINE BLOCK, WHEN DONE INSTALL NEW THERMOSTAT THEN INSTALL ORIGINAL THERMOSTAT HOUSING WITH NEW ORING WHICH YOU BUY AT DEALERSHIP.IF ALL SOUND COMPLICATED LET RADIATOR SHOP FLUSH OUT COOLANT SYSTEM.

Has the vehicle been run with anti-freeze its whole life? If not, then flush heater matrix.

With vehicle in cold state, disconnect heater matrix feed and return pipes from within engin bay. Turn the vehicle's internal temperature setting to hot. If the vehicle is fitted with climate control, then do this with the ignition in the 'on' position.

Take a garden hose and with low pressure first, try flushing the matrix. If the water pressure is not enough to flow through matrix at low to medium pressure, then a blockage is almost a certainty. If water does not flow at first, then try using a high pressure air-line to force air and any blockage material through the matrix and out of the exit pipe. You can also reverse the flow to blow or flush any dirt out of the other end.

Once all is clean and free flowing, reconnect and fill entire system with a 50-50 anti freeze-water solution.

If blockage cannot be resolved, then replace heater matrix.

If no blockage is present then continue to check heater control switches and wires.

Two ideas.

1. Try a new radiator reservoir cap (trust me, it is very important in holding pressure which keeps the coolant from boiling out).

2. This one you will need an entire weekend to spend on this. You need to remove the thermostat and replace the thermostat housing. pull one of the radiator hoses and attach a garden hose with good pressure. It needs to flush for at least 20 minutes. Then switch directions and flush water where was coming out. Then put it back together and drive until it gets hot. Allow it to cool for 45mins (to prevent engine from cracking due to rapid cooling) and repeat until no crud comes out when flushing.

Make sure the coolant level is full. If coolant levels are ok you made need to replace the thermostat .You can disconnect the heater hoses going to the heater core and flushing water through with a garden hose at low pressure. If the vehicle has the 4.3L engine these are quite prone to heater cores plugging up. Would try flushing the heater core first.If that does not work most likely the thermostat is causing your issue. Be sure to fill coolant back up after servicing and allow air to bleed from the cooling system.

yes very common you will have to flush it out using a garden hose with good water pressure. disconnect both hoses connect one to the hose and turn the water on keep switching to back flush it until clean water runs out of it. reconnect hoses and it will be fine.