Question about 1992 GMC Safari

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No heat I've flushed sytem and checked for water flow, theres no blockage fan works vacume hoses work, still no heat

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Did you change the thermostat?
if so. disconnect the upper hose that is connected to the firewall, it is the return for the heater core. and disconnect the lower hose as well. hook a water hose to the upper side and start with a low flow as to not blow out the finns. if this does not work you may have a stuck valve under the dash that opens the heat flap.

Posted on Apr 16, 2014

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SOURCE: I have a 1989 chev

Sounds Like A Head Gasket Problem. You Wont always See Water In The Oil !

Posted on Jan 12, 2011

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1 Answer

Change heater core water pump one pipe get hot


try some comma's?
my wild guess, is you are trying to fix a dead cab heater, right?
and if so, can be caused by 5 things wrong. total.
1 engine coolant not hot (180F or more)
2; fan dead.(cab heater fan)
3:or core , coolant path blocked. (seems you)
4; core exterior core blocked with leaves or pin needles. (sucked in)
5: optional core valve , stuck closed. (cable bad, etc)\



one pipe hot , means ,? core pipe 1 is hot, and other is dead cold?
this flow blockage , bingo !

if pipe 1 is 180F and other is 120f this is normal the heater is heating air in the cab and is dropping due to this heat exchange. (normal)
so why not do the 2 year full flush service now. (skipped i bet)
core hoses:
remove the 2 hoses on engine side, never core side (easy damage)
then back flush both hoses. with a garden hose.
if there is a valve there, test it and make sure it's opening... and free flowing.
and that both engine water ports are open too, from heater hose
to engine. (yes, they pack up too)

Dec 07, 2013 | 1998 Toyota Camry

1 Answer

Car over heated and thermostat light keeps going on.


Step 1:

When the thermo..do not work,there is an easy way to know...let the car running for at least 10min..turn it off..touch upper and lower hoses...if any of them is hot and the other is cold...thermos..not working.

Step 2:

check if fans activate when it reaches normal temperature, if they dont,replace fan switch at the botton of radiator,or check if the fans are burned.

Step 3:

you can flush the radiator by the usual way,but it will not unclog any cell of radiator...you must send it for service... but before u do it..do the cheap and easy staff...by the way...that car operate with a different cooling system...thats a closed pressured...so changing the cap of the reservoir helps ...since it has some valves that goes broken when is not change...hope it helps...

Mar 02, 2013 | 1996 Audi A6

1 Answer

Heater is very poor


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.

Oct 29, 2012 | 2000 Lincoln Navigator

1 Answer

I have a toyota coralla verso - the heating on it no longer works


Check heater core for proper flow. Do this by removing both heater hoses from the heater core and attempt to flush water through it with a garden hose. If it does not flow readily do not force it to. It is plugged and must be flushed using chemical and reversing the water flow.

If it flows ok look for a valve on one of the heater hoses and verify that it is opening. If it is not, it can be by passed with a 5/8 section of tubing in its place to retest and confirm.

Jan 13, 2010 | 2002 Toyota Corolla

1 Answer

1999 Ford Taurus, no heat. Air comes thru all vents but blows cold air like the ac is on. Replaced thermostat twice, flushed heater core three times (just did it), still ice cold air. Both pipes going into...


ford you say


check that there is flow coming out your heater hoses
step 1 remove 1c heater hose
step 2 have a friend start car remember it is easy to install a heater flush valve and it makes the job easier
if there is flow then eithor you have a blockage or an air lock
if there is no flow there might be a valve in the heater lines to stop the flow of coolant to the car when ac is on i have seen theise in a few cars but they are rare if there is a valve than make sure it isnt frozen with rust and ir does work in a ford i would assume that it is a vacume valve

good luck and happy hunting

Dec 30, 2009 | 1999 Ford Taurus

1 Answer

Heater not working (no heat)


If u have issues with heatting may be this will help.

1- If the carpet under the heater core is damp, or if antifreeze vapor or steam is coming through the vents, the heater core is leaking.Remove it and install a new unit (most radiator shops will not repair a leaking heater core.

1 - If the air coming out of the heater vents isn't hot, the problem could stem from any of the following causes:
  • The thermostat is stuck open, previnting the engine coolant from warming enough to carry heat to the heater core. Replace the thermostat.
  • There is a blockage in the system, Preventing the flow of coolant through heater core. Feel both heater hoses the firewall. They should be hot.if one of them is cold, there is an obstruction in one of the hoses or in the heater core,or the heater control valve is shut. Detach the hoses and back flush the heater core with a water hose. If the heater core is clear but circulation is impeded, remove the two hoses and flush them out with a water hose.
  • If flushing fails to remove the blockage from the heater core, the coremust replaced.

Nov 19, 2009 | 2003 Ford F250 Super Duty Crew Cab

2 Answers

My heater not working, i replaced thermostat and radiator hoses, had radiator flushed and rodded, and still no heat. What is wrong?


Too much blockage in heater hoses or heater core.
Bypass valve may be stuck on "bypass" .

1. Remove bypass "Tees", but don't discard.
Replace with straight-through hose fittings.
The core may start leaking under the water pressure since there is no bypass hose.

Once the heater starts working, put Tees back in place. You need bypass protection or the engine will overheat.

Sep 25, 2009 | 1996 Ford F150 Regular Cab

3 Answers

98 cadillac seville 4.6 overheating


are your fans or fan working if not it will get hot. I assume you have electric fans or fan if so make sure when it starts to overheat the fan or fans come on if not check the fuse for the fans or relay, breaker, wiring itself.

Sep 03, 2009 | 1998 Cadillac Seville

5 Answers

1984 944 Porsche - Overheating


did you replace the heater core? Does your heater work when you turn it on full, with fan. What I'm getting at is your control to the heater stuck open an blocked. Also believe it or not if your heater is fully functioning you can cool your engine somewhat by turning the heat on inside the car, thus increasing the surface area for heat dissipation. Try a back flush of your entire cooling system.

Jun 16, 2009 | 1987 Porsche 944

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