Question about Jeep Cherokee
Check your coolant level first. Next check your heater control valve. With engine at operating temp and heater on high, do this:
1. Heater hose from water pump should be hot (if not, water pump may be dead or thermostat is stuck closed)
2. Heater hose from thermostat housing should be hot (if not, thermostat may be stuck closed or water pump is dead)
3. Heater hose going to heater core should be hot ( if not, heater control valve is not getting vacuum from heater control unit, or valve is broken)
4. Heater hose returning from heater core should be hot (if not, heater core is blocked, undo both hoses to core and flush with water hose until clear)
Test thermostat: with cold engine cranked, watch water temp gauge. As it gets hotter and hotter, when the thermostat opens, the temp should drop suddenly and then go back up.
Test water pump: with engine at operating temp. Squeeze top radiator hose tight, when you release it, you should feel/hear a surge of water. It is much like when you pinch a water hose closed and release it.
Test vacuum from heater control unit to heater control valve: undue vacuum line from control valve. It should have a vacuum when pressed against you skin in addition to releasing the actuating arm on the control valve.
If there is no vacuum, a quick fix will be to disconnect the plastic actuator from the silver arm on the heater valve. This will let the hot water to always flow to your heater core.
Posted on Dec 18, 2008
a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
Posted on Jan 02, 2017
Tips for a great answer:
Dec 10, 2015 | 1989 Chevrolet C1500
Aug 31, 2015 | Ford Cars & Trucks
Jun 07, 2015 | AC Cars & Trucks
Mar 09, 2011 | 2004 Chevrolet TrailBlazer
Mar 12, 2009 | 2006 Ford F-250 Super Duty
Jan 18, 2009 | 1997 Chevrolet K1500
Jan 15, 2009 | 2005 Chevrolet Avalanche
May 25, 2017 | 1995 Jeep Grand Cherokee
830 people viewed this question
Usually answered in minutes!
Step 2: Please assign your manual to a product: