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1995 GMC Safari No Heat

Tiny
N.KOZIARA
  • MEMBER
  • 1995 GMC SAFARI
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 112,200 MILES
My car gets no heat unless I am traveling at high speeds for about 10 min. My temp Gauge reads high 235, once the van runs for a while but does not overheat or change performance. I changed the thermostat, but still no change, I was told it could be my water pump, or my heater core is cloged. I see no leaks under van overnight. Also, coolant in reservour doesnt change much when van is hot. What do you think it could be?
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Sunday, January 10th, 2010 AT 3:58 PM

3 Replies

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Retest the thermostat if okay -Could be a clogged-up radiator and heater core to include air in the system-If its the water pump it will start to overheat within 10mins
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Sunday, January 10th, 2010 AT 4:36 PM
Tiny
N.KOZIARA
  • MEMBER
  • 2 POSTS
The temp runs high, but I drove 40 min. On highway, no smoke no change in performance, I think it may be a clogged heater core, I've heard it is possible to use a garden hose to flush it out, have you ever heard this?
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Monday, January 11th, 2010 AT 8:16 AM
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Try flushing it out and also check if it has a heater control valve and check that too-or could very well be a door problem with air mix/blend/mode, vacuum and actuator and the HVAC contol module
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Monday, January 11th, 2010 AT 9:18 AM

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